Subjective optometry device and subjective optometry program

Abstract

To provide a subjective ophthalmic device and a subjective ophthalmic program which can accurately acquire optical characteristics of a subject eye.SOLUTION: A subjective ophthalmic device comprises: correction means which includes a variable focus member whose focal distance is variable and changes optical characteristics of a target light flux emitted from target presentation means by the variable focus member; setting means which sets a change amount of the optical characteristics by the correction means; correction control means which controls the variable focus member in the correction means on the basis of the change amount set by the setting means; acquisition means which acquires change information indicating the change in the optical characteristics by the variable focus member after the correction control means controls the variable focus member on the basis of the change amount and a change setting of the optical characteristic is complete; comparison processing means which performs comparison processing between change information acquired by the acquisition means and a calibration value for calibrating degradation of the focus member; and calibration control means which executes control for performing calibration of the variable focus member on the basis of the comparison result by the comparison processing means.SELECTED DRAWING: Figure 1

Description

Technical Field

[0006] , , ,

[0001] The present disclosure relates to a subjective ophthalmic apparatus and a subjective ophthalmic program for voluntarily measuring the optical characteristics of an eye to be examined.

Background Art

[0002] There is known a subjective ophthalmic apparatus that measures the optical characteristics of an eye to be examined by arranging an optical member in front of the eye of the subject and presenting a test target through the optical member to the eye to be examined. In Patent Document 1, by using a variable focus lens capable of changing the focal length as the optical member and changing the refractive power of the target light beam, the correction amount for correcting the eye to be examined is changed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, it cannot be denied that the amount of change in the refractive power of the variable focus lens may decrease due to deterioration. For example, when the variable focus lens deteriorates due to aging or the like, it cannot be changed to the refractive power desired by the examiner, and the eye to be examined cannot be appropriately corrected, so that the optical characteristics of the eye to be examined may not be accurately obtained.

[0005] In view of the above problems, the technical problem of the present disclosure is to provide a subjective ophthalmic apparatus and a subjective ophthalmic program capable of accurately obtaining the optical characteristics of an eye to be examined.

Means for Solving the Problems

[0006] To solve the above problems, the present invention is characterized by having the following configuration. (1) A subjective optometry device according to a first aspect of the present disclosure is a subjective optometry device for subjectively measuring the optical characteristics of an eye to be examined, comprising: a variable focal length member having a variable focal length; a correction means for changing the optical characteristics of a target light beam emitted from a target presentation means by the variable focal length member; a setting means for setting the amount of change in the optical characteristics by the correction means; a correction control means for controlling the variable focal length member in the correction means based on the amount of change set by the setting means; an acquisition means for acquiring change information indicating the change in the optical characteristics by the variable focal length member after the correction control means controls the variable focal length member based on the amount of change and the setting of the change in the optical characteristics is completed; a comparison processing means for comparing the change information acquired by the acquisition means with a calibration value for calibrating the deterioration of the variable focal length member; and a calibration control means for executing control for calibrating the variable focal length member based on the comparison result by the comparison processing means. (2) A subjective optometry program according to a second aspect of the present disclosure is a subjective optometry program for use in a subjective optometry device for subjectively measuring the optical characteristics of an eye, the subjective optometry device having a variable focal length variable focal member and a correction means for changing the optical characteristics of a target light beam emitted from a target presentation means by the variable focal member, the subjective optometry device is characterized in that it is executed by the processor of the subjective optometry device, and includes: a setting step for setting the amount of change of the optical characteristics by the correction means; a correction control step for controlling the variable focal member in the correction means based on the amount of change set in the setting step; an acquisition step for acquiring change information indicating the change of the optical characteristics by the variable focal member after the correction control step has controlled the variable focal member based on the amount of change and the setting of the change of the optical characteristics is completed; a comparison processing step for comparing the change information acquired in the acquisition step with a calibration value for calibrating the deterioration of the variable focal member; and a calibration control step for executing control for calibrating the variable focal member based on the comparison result of the comparison processing step. [Brief explanation of the drawing]

[0007] [Figure 1] This is an external view of a subjective optometry device. [Figure 2] This is a schematic diagram of the projection optical system. [Figure 3] This is a diagram illustrating the configuration of the measurement optical system. [Figure 4] This is a schematic diagram of the eye refractive power measurement unit. [Figure 5] This is a schematic diagram of the lens unit. [Figure 6] This is a schematic diagram of the control system for a subjective optometry device. [Figure 7] This diagram illustrates the relationship between the amount of spherical correction and the calibration value. [Figure 8] This diagram shows an image sensor for detecting an inspection target arranged within a lens unit. [Figure 9] This diagram shows an image sensor for detecting anterior segment images arranged within a lens unit. [Modes for carrying out the invention]

[0008] <Overview> An overview of the subjective ophthalmoscopic device according to this embodiment will be described below. The items classified in <> below may be used independently or in relation to each other.

[0009] The subjective optometry device of this embodiment is a device for subjectively measuring the optical properties of the eye under examination. For example, the optical properties of the eye under examination may be refractive power (for example, at least one of spherical refractive power, cylindrical refractive power, astigmatism axis angle, etc.), binocular vision function (for example, at least one of prism amount, stereopsis function, etc.), contrast sensitivity, etc.

[0010] <Correction means> The subjective optometry device of this embodiment may include a corrective means. The corrective means has a variable focal length member that changes the optical properties of the target light beam emitted from the target presentation means. For example, there may be one variable focal length member or multiple members. For example, the variable focal length member may be a variable focal lens. As the variable focal lens, at least one of a liquid lens, liquid crystal lens, Alvarez lens, etc. may be used. For example, the target light beam from the target presentation means may be guided towards the eye under examination via a light projection optical system (e.g., light projection optical system 30). For example, the light projection optical system may have at least one optical member for passing the target light beam emitted from the target presentation means. As an example, it may have at least one of a lens, a mirror, etc.

[0011] For example, the correction means can be configured to change the optical properties of the target light beam.

[0012] For example, the correction means may include an optical element. For example, the optical element may be at least one of a spherical lens, a cylindrical lens, a cross-cylinder lens, a rotary prism, a wavefront modulation element, a variable focus member, etc. Of course, the optical element may be different from these. In this case, the optical properties of the target light beam are changed by controlling the optical element.

[0013] Furthermore, the corrective means may have a configuration for optically changing the presentation position (presentation distance) of the target to the eye under examination. For example, it may have a configuration for moving the target presentation means in the optical axis direction, or it may have a configuration for moving an optical element (e.g., a spherical lens) in the optical path in the optical axis direction. In this case, the optical properties of the target beam are changed by controlling a driving means for controlling at least one of the target presentation means and the optical element.

[0014] Further, for example, the correction means may be an eye refractive power measurement unit (e.g., the eye refractive power measurement unit 40) that switches and arranges an optical element (e.g., the optical element 51) in front of the eye to be examined through an inspection window (e.g., the inspection window 43). For example, the eye refractive power measurement unit may have a lens disk (e.g., the lens disk 50) on which a plurality of optical elements are arranged on the same circumference. In this case, the optical characteristics of the target light beam are changed by controlling the driving means (e.g., the driving unit 51, the driving unit 53, etc.) for controlling the lens disk.

[0015] When using an eye refractive power measurement unit as the correction means, the eye refractive power measurement unit may have a variable focus member, and in a state where the variable focus member is arranged in the optical path of the target light beam, by changing the focal length of the variable focus member, the optical characteristics of the target light beam may be changed. For example, the variable focus member may be fixedly arranged in front of the eye to be examined. As an example, in this case, the variable focus member may always be arranged on the inspection window. Further, for example, the variable focus member may be switched and arranged in front of the eye to be examined. As an example, in this case, the variable focus member may be provided on the lens disk.

[0016] <Setting means> The subjective ophthalmic apparatus of the present embodiment may include setting means (for example, control unit 60). The setting means sets the amount of change in the optical characteristics by the correction means. For example, the amount of change in the optical characteristics by the correction means may be at least either a predetermined refractive power or a predetermined angle for changing the optical characteristics of the target light beam by the variable focus member. As an example, the amount of change in the optical characteristics by the correction means may be at least any one of an arbitrary spherical refractive power, cylindrical refractive power, and astigmatic axis angle specified by the examiner. Also, as an example, the amount of change in the optical characteristics by the correction means may be at least any one of a spherical refractive power, cylindrical refractive power, and astigmatic axis angle preset by experiments or simulations. Also, as an example, the amount of change in the optical characteristics by the correction means may be at least any one of a spherical refractive power (spherical correction amount), cylindrical refractive power (cylindrical correction amount), and astigmatic axis angle (astigmatic axis correction amount) based on the objectively measured optical characteristics (objective values) of the eye to be examined.

[0017] For example, the setting means may set an arbitrary amount of change input by an operation of an operation means (for example, examiner controller 70) by the examiner. Also, for example, the setting means may automatically set a predetermined amount of change when a calibration mode for calibrating the deterioration of the variable focus member is selected. Also, for example, the setting means may read an identifier for each subject and set the amount of change stored in the identifier. As an example, an ID, a character string, a one-dimensional code, a two-dimensional code, a color code, etc. may be used for the identifier. Also, for example, the setting means may set the amount of change by receiving data measured using a device different from the subjective ophthalmic apparatus of the present embodiment.

[0018] <Correction control means> The subjective optometry device of this embodiment may include a correction control means (for example, a control unit 60). The correction control means controls the variable focus member in the correction means based on the amount of change in optical characteristics set by the setting means. For example, the correction control means controls the variable focus member to seamlessly change the optical characteristics of the target light beam. For example, the control means may change the optical characteristics of the target light beam by changing the focal length of the variable focus member while the variable focus member is positioned in the optical path of the target light beam. As an example, if the variable focus member is fixedly positioned in front of the eye under examination, the control means may change the focal length of the variable focus member. Also, as an example, if the variable focus member is provided on the lens disk of the refractive power measurement unit, the control means may rotate the lens disk of the refractive power measurement unit to position the variable focus member on the lens disk in the examination window and change the focal length of the variable focus member.

[0019] <Acquisition method> The subjective optometry device of this embodiment may include an acquisition means (for example, a control unit 60). The acquisition means acquires change information indicating the change in optical characteristics due to the variable focus member after the correction control means controls the variable focus member based on the amount of change in optical characteristics and the setting of the change in optical characteristics is completed. For example, the change information indicating the change in optical characteristics due to the variable focus member may be information that changes between before and after the setting of the change in the optical characteristics of the target light beam by the variable focus member is completed.

[0020] For example, the change information indicating the change in optical properties due to the variable focus member may be optical property information relating to the optical properties of the target light beam that have changed as a result of the control of the variable focus member. As an example, it may be the actual optical property value relative to the amount of change in the optical properties of the target light beam set by the setting means. In other words, it may be the actual optical property value of the target light beam after the setting of the change in the optical properties of the target light beam due to the variable focus member is completed. For example, such optical property information may be refractive power (for example, spherical refractive power, cylindrical refractive power, astigmatism axis angle, etc.), and the acquisition means may acquire the actual refractive power value of the target light beam after the setting of the change in refractive power of the target light beam due to the variable focus member is completed.

[0021] Furthermore, for example, the change information indicating the change in optical properties due to the variable focus member may be image information relating to the image of the light beam from the light source that has changed as a result of the control of the variable focus member. For example, the image of the light beam from the light source may be an anterior segment image of the anterior segment of the eye under examination, based on the photographic light beam irradiated from the light source and transmitted through the variable focus member. Alternatively, for example, the image of the light beam from the light source may be a pattern image based on a pattern light beam irradiated from the light source and transmitted through the variable focus member. As an example, in this case, a screen with many holes (a so-called Hartmann plate) may be provided to convert the light beam from the light source into an arbitrary pattern light beam, and multiple point images may be acquired as the pattern image. Alternatively, in this case, a ring optical member (e.g., a ring lens) may be provided to convert the light beam from the light source into an arbitrary pattern light beam, and a ring image may be acquired as the pattern image. For example, the image of the light beam from the light source may be either such an anterior segment image or a pattern image (here, a point image, a ring image, etc.), or a combination thereof, or it may include images different from the anterior segment image and the pattern image.

[0022] For example, image information relating to the image of a light beam from a light source may be at least one of the following: luminance information, contrast information, etc. For example, luminance information may be at least one of the following: luminance value, luminance distribution, histogram, blur amount, etc. Of course, luminance information may be a combination of these. For example, contrast information may be at least one of the following: contrast value, contrast sensitivity, blur amount, etc. Of course, contrast information may be a combination of these. For example, image information relating to the image of a light beam from a light source may be either such luminance information and contrast information, a combination of these, or may include information different from luminance information and contrast information.

[0023] Furthermore, for example, image information relating to the image of the light beam from the light source may be at least one of the following: similarity, degree of agreement, etc., obtained by difference processing of luminance information and contrast information in each image. For example, at least one of the following may be calculated and obtained by using methods such as edge detection and template matching as the difference processing between a reference image such as a pre-prepared anterior segment image or pattern image and a target image such as an anterior segment image or pattern image acquired by the acquisition means.

[0024] The acquisition means may acquire either optical characteristic information relating to the optical characteristics of the target luminous beam or image information relating to the image of the luminous beam from the light source, as change information indicating the change in optical characteristics due to the variable focus member. Of course, both optical characteristic information relating to the optical characteristics of the target luminous beam and image information relating to the image of the luminous beam from the light source may be acquired.

[0025] <Comparison Processing Means> The subjective eye examination device of this embodiment may include a comparison processing means (for example, a control unit 60). The comparison processing means compares the change information acquired by the acquisition means with a calibration value for calibrating the deterioration of the variable focus member.

[0026] For example, the calibration value may be a value used to detect whether or not deterioration has occurred in the variable focus member. For example, the calibration value may be a value that can be arbitrarily set by the examiner, or it may be a fixed value that has been set in advance by experiment or simulation. For example, the calibration value may be set as a predetermined threshold. For example, the predetermined threshold may be the same value as the amount of change set by the setting means. For example, the predetermined threshold may be a different value from the amount of change set by the setting means. There may be one predetermined threshold or there may be multiple predetermined thresholds. For example, if multiple predetermined thresholds are set as calibration values, the calibration values ​​may be set as a predetermined tolerance range.

[0027] For example, the calibration value may be set as a uniform value regardless of the amount of change in the optical characteristics of the target luminous flux set by the setting means. Alternatively, for example, the calibration value may be set as different values ​​corresponding to the amount of change in the optical characteristics of the target luminous flux set by the setting means. For example, in this case, the calibration value may be changed depending on whether the amount of change set by the setting means exceeds a predetermined amount of change. For example, the calibration value may be changed for values ​​less than 5.0D and values ​​of 5.0D or more. Alternatively, for example, in this case, the calibration value may be changed according to the steps of the amount of change set by the setting means. For example, the calibration value may be changed each time the amount of change set by the setting means changes in units of 0.25D, 1.0D, 5.0D, etc. Note that the larger the absolute value of the amount of change in the optical characteristics due to the variable focus member set by the setting means (i.e., the greater the number of degrees of change in the optical characteristics), the greater the possibility that the change information of the variable focus member acquired by the acquisition means may be off if it has changed over time. Therefore, as in this embodiment, by setting different calibration values ​​for each amount of change, the variable focus member can be calibrated with high accuracy.

[0028] For example, the comparison processing means may directly compare the change information acquired by the acquisition means with the calibration value for calibrating the deterioration of the variable focus member. For example, the comparison processing means may perform a difference processing as a comparison process between the change information acquired by the acquisition means and the calibration value for calibrating the deterioration of the variable focus member. This may result in obtaining, for example, the difference result of the parameters between the change information acquired by the acquisition means and the calibration value for calibrating the deterioration of the variable focus member. For example, if the aforementioned acquisition means acquires optical characteristic information as change information indicating a change in optical characteristics due to the variable focus member, the parameter may be refractive power (for example, at least one of spherical refractive power, cylindrical refractive power, and astigmatism axis angle). For example, if the aforementioned acquisition means acquires image information as change information indicating a change in optical characteristics due to the variable focus member, the parameter may be at least one of luminance value, luminance distribution, histogram, contrast value, contrast sensitivity, blur amount, similarity, match, etc.

[0029] For example, the comparison processing means may indirectly compare the change information acquired by the acquisition means with the calibration value for calibrating the deterioration of the variable focus member by performing a comparison process between the amount of change in optical characteristics set by the setting means and the change information acquired by the acquisition means, and a calibration value for calibrating the deterioration of the variable focus member. For example, the change information based on the amount of change in optical characteristics set by the setting means and the change information acquired by the acquisition means may be obtained by a difference processing of these. As an example, it may be obtained by a difference processing of the amount of change in optical characteristics and the optical characteristic information in the change information. As another example, it may be obtained by a difference processing of the amount of change in optical characteristics and the image information in the change information. In this case, the value of the actual optical characteristics with respect to the amount of change in optical characteristics of the target light beam set by the setting means may be calculated based on the image information. For example, if the variable focus member undergoes aging or other changes, the amount of change in optical characteristics set by the setting means and the change information acquired by the acquisition means may differ from each other. Therefore, such discrepancies can be easily detected between the amount of change and the change information using this type of discrepancy information.

[0030] The comparison processing means is not limited to the above configuration, and any configuration that allows comparison between the change information acquired by the acquisition means and the calibration value for calibrating the deterioration of the variable focus member is acceptable.

[0031] <Calibration control means> The subjective eye examination device of this embodiment may include a calibration control means (for example, a control unit 60). The calibration control means executes control for calibrating the variable focus member based on the comparison result by the comparison processing means. For example, the comparison result by the comparison processing means may be the difference between the change information acquired by the acquisition means and the calibration value for calibrating the deterioration of the variable focus member. Alternatively, for example, the comparison result by the comparison processing means may be a detection result that detects whether the change information acquired by the acquisition means matches the calibration value for calibrating the deterioration of the variable focus member. Alternatively, for example, the comparison result by the comparison processing means may be a detection result that detects whether the change information acquired by the acquisition means exceeds the calibration value for calibrating the deterioration of the variable focus member. For example, by executing control for calibrating the variable focus member based on such a comparison result by the comparison processing means, the accuracy of the refractive power of the variable focus member can be maintained even if deterioration occurs in the variable focus member due to aging or other reasons.

[0032] For example, the calibration control means may perform calibration of the variable focus member by changing the refractive force of the variable focus member controlled by the correction control means as a control for performing calibration of the variable focus member. For example, the calibration control means may add an additional refractive force to the variable focus member so that the change information of the optical characteristics of the target light beam acquired by the acquisition means falls within the calibration value for calibrating the deterioration of the variable focus member. Alternatively, for example, the calibration control means may add an additional refractive force to the variable focus member so that the discrepancy between the amount of change in the optical characteristics of the target light beam set by the setting means and the change information of the optical characteristics of the target light beam acquired by the acquisition means falls within the calibration value for calibrating the deterioration of the variable focus member. For example, the calibration control means may perform calibration of the variable focus member by changing the refractive force of the variable focus member by adjusting the drive amount of the variable focus member. As an example, the calibration control means may perform calibration by adjusting the applied voltage so that the correct refractive force is generated when a predetermined applied voltage is applied to the variable focus member. This allows for maintaining the accuracy of the refractive power of the variable focus member.

[0033] For example, the calibration control means may output calibration-related information regarding the calibration of the variable focus member as a control for performing calibration of the variable focus member. For example, the calibration control means may control a display means and cause the display means to display the calibration-related information. Alternatively, for example, the calibration control means may control a sound generation means (for example, a speaker) and cause the sound generation means to generate the calibration-related information as sound. Alternatively, for example, the calibration control means may control a notification means (for example, a lamp) and indicate the calibration-related information by lighting or flashing the notification means. Alternatively, for example, the calibration control means may control a printing means and cause the printing means to print the calibration-related information. Of course, for example, the calibration control means may perform a combination of these controls, or perform controls different from these. This makes it easy to calibrate the variable focus member.

[0034] For example, the calibration control means may output the comparison result from the comparison processing means as calibration-related information. Alternatively, for example, the calibration control means may output notification information as calibration-related information informing the examiner that calibration of the variable focus member will be performed. In this case, the calibration control means may change the refractive power of the variable focus member based on the operation signal input by the examiner confirming the notification information and operating the operation means. Alternatively, for example, the calibration control means may output guidance information as calibration-related information to prompt the examiner to calibrate the variable focus member. In this case, the calibration control means may output at least one of the following as guidance information: an icon indicating that calibration of the variable focus member is necessary, a message indicating the examiner's next operation, a guidance mark indicating the position of the button to be selected by the examiner to perform the next operation, etc. Note that the guidance information only needs to be something that can prompt calibration of the variable focus member, and may be different from the icon, message, guidance mark, etc. This allows the examiner to confirm the guidance information and easily decide whether or not to calibrate the variable focus member.

[0035] <Detection method> The subjective optometry device of this embodiment may include detection means. For example, the detection means may be positioned at any location in the subjective optometry device. For example, the subjective optometry device may have the detection means integrated into it. Alternatively, for example, the subjective optometry device may have the detection means as an attachment to be mounted on the subjective optometry device.

[0036] For example, the detection means detects the light beam emitted from the light source and passing through the variable focus member. For example, the detection means may be positioned on the side of the eye being examined relative to the variable focus member, or on the opposite side of the eye being examined relative to the variable focus member. In this case, the acquisition means may acquire change information indicating the change in optical properties due to the variable focus member based on the detection result by the detection means. For example, since the detection result obtained by the light beam from the light source passing through the variable focus member differs between a state in which the variable focus member is not deteriorated and a state in which it is deteriorated, such a configuration makes it easy to acquire change information of the variable focus member.

[0037] For example, the detection means may detect the reflected light beam that is irradiated from a light source toward the object under test and reflected by the object under test. For example, the object under test may be at least one of the following: an eye under test, a model eye, etc. In this case, the acquisition means may acquire change information indicating the change in optical properties due to the variable focus member based on the reflected light beam detected by the detection means.

[0038] For example, if the object being examined is an eye or a model eye, the detection means may detect the corneal reflected light beam that is irradiated from the light source toward the eye (model eye) and reflected by the cornea of ​​the eye (model eye). This may allow for the detection of at least one of the following: a corneal bright spot image projected onto the eye based on the imaging light beam irradiated from the light source and transmitted through a variable focus member; an anterior segment image of the eye; an anterior segment image including the corneal bright spot image; etc.

[0039] Furthermore, for example, if the object under test is an eye or a model eye, the detection means may detect the fundus-reflected light beam that is irradiated from the light source toward the eye (model eye) under test and reflected from the fundus of the eye (model eye). In this case, an optical member for extracting the photographic light beam irradiated from the light source and passed through the variable focus member as an arbitrary pattern light beam may be provided in the optical path of the photographic light beam. As an example, an optical member such as a screen with many holes or a ring optical member may be provided in the optical path of the photographic light beam. As a result, for example, the detection means may detect a point image or a ring image as a pattern image based on the pattern light beam irradiated from the light source and passed through the variable focus member. For example, the detection result obtained by the reflected light beam reflected from the object under test will differ depending on whether the variable focus member is in a non-degraded state or a deteriorated state. More specifically, the shape of the pattern image will differ. For this reason, by providing such a configuration, information on changes in the variable focus member can be easily obtained.

[0040] For example, the detection means may detect the target light beam emitted from the target presentation means and transmitted through the variable focus member. In this case, the acquisition means may acquire change information indicating a change in the optical properties due to the variable focus member based on the detection result of the target light beam by the detection means. That is, the target presentation means may be used as a light source, and the target light beam irradiated from the target presentation means and transmitted through the variable focus member may be detected as an image of the target displayed on the target presentation means, and change information may be acquired based on the image of the target. For example, the appearance of such an image of the target will be detected differently depending on whether the variable focus member is in a non-degraded state or a deteriorated state, so with this configuration, change information of the variable focus member can be easily acquired.

[0041] In the subjective optometry device of this embodiment, the correction means may include a fixed optical member that can be switched and positioned within the optical path of the target light beam emitted from the target presentation means. For example, the fixed optical member may be an optical member with a constant focal length. One example is a spherical lens, a cylindrical lens, etc. In this case, the detection means may detect the light beam emitted from the light source and passing through the variable focus member and the fixed optical member. The acquisition means may also acquire change information indicating the change in optical characteristics due to the variable focus member based on the detection result by the detection means. For example, while the variable focus member deteriorates due to aging, etc., the fixed optical member has a constant refractive power and is therefore less affected by deterioration due to aging, etc. For this reason, for example, by arranging the fixed optical member to cancel out the refractive power adjusted by the variable focus member and detecting the light beam passing through the variable focus member and the fixed optical member, change information of the variable focus member can be easily acquired.

[0042] This disclosure is not limited to the apparatus described in this embodiment. For example, terminal control software (program) that performs the functions of the above embodiment can be supplied to the apparatus or system via a network or various storage media, and the control device (e.g., CPU) of the apparatus or system can read and execute the program.

[0043] <Examples> The configuration of the subjective optometry device in this embodiment will now be described. In this embodiment, the subjective optometry device is exemplified as one that integrates a display for displaying visual targets and an eye refractive power measurement unit for subjectively measuring the refractive power of the eye being examined. Of course, for example, the display may be provided in a separate housing from the subjective optometry device.

[0044] <Appearance of the device> Figure 1 is an external view of the subjective optometry device 100. Figure 1(a) shows the refractive power measurement unit 40 supported in the standby position. Figure 1(b) shows the refractive power measurement unit 40 supported in the measurement position. For example, the subjective optometry device 100 includes a housing 1, a display window 2, a speaker 3, a holding unit 4, an examiner controller 70, an refractive power measurement unit 40, etc.

[0045] The housing 1 has a light projection optical system 30 inside. The presentation window 2 transmits the target light beam from the light projection optical system 30. The target light beam is projected onto the eye E being examined via the presentation window 2. If the refractive power measurement unit 40 is placed between the eye E being examined and the presentation window 2 (see Figure 1(b)), the target light beam is projected onto the eye E being examined via the presentation window 2 and the examination window 43 described later. In this way, the examination target is presented to the eye E being examined. The speaker 3 outputs voice guidance, etc.

[0046] The holding unit 4 holds the eye refractive power measurement unit 40. For example, the holding unit 4 moves the eye refractive power measurement unit 40 connected to the arm by moving the arm driven by a drive unit (motor, etc.) not shown. This switches the eye refractive power measurement unit 40 between the standby position and the measurement position.

[0047] The examiner controller 70 is used by the examiner to operate the subjective ophthalmoscopic examination device 100. The examiner controller 70 includes a switch unit 71, a monitor 72, etc. The switch unit 71 receives signals for various settings (for example, movement of the ocular refractive power measurement unit 40, etc.). The monitor 72 displays various information (for example, measurement results of the eye under examination E, etc.). The monitor 72 may also function as a touch panel that also serves as the switch unit 71. Signals from the examiner controller 70 are output to the control unit 60, which will be described later, via wired or wireless communication.

[0048] <Floodlight Optics> The projection optical system 30 will now be described. For example, Figure 2 is a schematic diagram of the projection optical system. Figure 2(a) shows the optical arrangement during distance vision testing. Figure 2(b) shows the optical arrangement during near vision testing. For example, the projection optical system 30 has a target presentation unit and projects the target light beam emitted from the target presentation unit toward the eye E under examination. For example, in this embodiment, a display (e.g., display 11) is used as the target presentation unit. For example, the projection optical system 30 includes a display 11, a planar mirror 12, a concave mirror 13, a distance / near switching unit 20, etc.

[0049] For example, the display 11 displays test targets such as Landolt ring targets and fixation targets. For example, the display on the display 11 is controlled by the control unit 60, which will be described later. For example, an LCD (Liquid Crystal Display), an organic EL (Electro Luminescence), a plasma display, etc. may be used as the display.

[0050] For example, during the distance vision test shown in Figure 2(a), the screen of the display 11 faces the back of the housing 2, and the target light beam is emitted in the direction of the back. The target light beam may be emitted horizontally (Z direction) or obliquely (YZ direction) from the display. For example, during the near vision test shown in Figure 2(b), the screen of the display 11 faces upward, and the target light beam is emitted upward. The target light beam may be emitted vertically (Y direction) or obliquely (YZ direction) from the display. In this way, the target light beam from the display 11 is projected toward the eye E under examination.

[0051] For example, the planar mirror 12 reflects the target light beam from the display 11 and guides it to the concave mirror 13. Alternatively, for example, the planar mirror 12 reflects the target light beam from the display 11 and guides it to the eye E under examination. For example, the planar mirror 12 has a mirror coating only on its lower part (the solid line portion of the planar mirror 12 in Figure 2), and the upper part (the dotted line portion of the planar mirror 12 in Figure 2) does not have a mirror coating.

[0052] Therefore, in this embodiment, the upper part of the plane mirror 12 is transparent. For example, the focal length of the plane mirror 12 during near-vision testing is designed so that the optical distance from the display to the eye E under examination is 40 cm. In this embodiment, any configuration that can reflect the target light beam is acceptable, and is not limited to the use of a plane mirror. For example, any reflective material will suffice. In this case, for example, a configuration using a prism, beam splitter, half mirror, etc., may also be used.

[0053] For example, the concave mirror 13 reflects the target light beam from the display 11 toward the planar mirror 12. For example, the concave mirror 13 sets the presentation distance of the test target displayed on the display 11 to the distance test distance. For example, the focal length of the concave mirror 13 is designed so that the optical distance from the display 11 to the eye E under test is 5m. In this embodiment, the configuration is not limited to the use of a concave mirror 13. For example, a reflective member capable of reflecting the target light beam may be used. In this case, for example, an aspherical mirror or a free-form mirror may be used. Alternatively, for example, a lens may be used. In this case, for example, the target light beam may be projected from the display 11 to the eye E under test via the lens, and the lens may be designed so that the optical distance from the display 11 to the eye E under test is 5m.

[0054] For example, the beam splitter 150 transmits the target light beam from the display 11, which has been reflected by the plane mirror 12, and guides it to the eye under examination E. Also, for example, the beam splitter 150 reflects the measurement light emitted from the measurement light source 130 of the measurement optical system 100 (described later) and guides it to the eye under examination E.

[0055] For example, during a distance vision test as shown in Figure 2(a), a target light beam is projected onto the subject's eye E, emitted from the display 11 and passing through the optical components in the following order: planar mirror 12, concave mirror 13, planar mirror 12, and beam splitter 150. That is, the target light beam emitted from the display 11 passes through the optical axis L1 and enters the planar mirror 12, where it is reflected in the direction of the optical axis L2 and heads toward the concave mirror 13. When this target light beam enters the concave mirror 13, it is reflected in the direction of the optical axis L3 and heads toward the planar mirror 12. Furthermore, when the target light beam enters the planar mirror 12, it is reflected in the direction of the optical axis L4, passes through the beam splitter 150, and is projected onto the subject's eye E. Also, for example, during a near vision test as shown in Figure 2(b), the target light beam emitted from the display 11 and reflected by the planar mirror 12 passes through the beam splitter 150 and is projected onto the subject's eye E. In other words, the target light beam emitted from the display 11 passes through the optical axis L3, enters the plane mirror 12, is reflected in the direction of the optical axis L4, and is projected onto the subject's eye E via the beam splitter 150. For example, the projection optical system 30 emits the target light beam from the inside to the outside of the housing 2 in this manner.

[0056] For example, the distance / near switching unit 20 is used to switch between the distance vision test optical path during distance vision testing and the near vision test optical path during near vision testing. For example, the distance vision test optical path is an optical path that projects the target light beam emitted from the display 11 toward the eye to be examined via the concave mirror 13, thereby projecting the target light beam toward the eye to be examined at the distance vision test distance. Alternatively, for example, the near vision test optical path is an optical path that projects the image of the target light beam from the display 11 toward the eye to be examined at the near vision test distance without passing through the concave mirror 13.

[0057] For example, the distance / near switching unit 20 changes the position of the display 11 between distance vision tests and near vision tests. For example, the distance / near switching unit 20 includes a holding unit 21, a gear 22, a motor 23, etc. For example, the holding unit 21 holds the display 11. For example, the gear 22 has a worm unit 24 and a wheel unit 25. For example, the worm unit 24 and the wheel unit 25 are formed by gears that mesh with each other. For example, the motor 23 is connected to the worm unit 24, and the holding unit 21 is connected to the wheel unit 25. For example, when the motor 23 is driven, the worm unit 24 rotates, and the wheel unit 25 rotates in the direction of the arrow. This makes it possible to move the display 11 together with the holding unit 21, and to switch the presentation position of the test target displayed on the screen of the display 11 between distance vision tests and near vision tests. The gear 22 and motor 23 are located on the side wall of the housing 2, positioned so as not to obstruct the target light beam from the display 11 toward the eye E under examination.

[0058] <Measurement optical system> Figure 3 illustrates the configuration of the measurement optical system 100. The measurement optical system 100 will be described below using Figures 2 and 3. For example, the measurement optical system 100 objectively measures the optical properties of the eye under examination. Examples of optical properties of the eye under examination include refractive power, axial length, and corneal shape. In this embodiment, the measurement optical system for measuring the refractive power of the eye under examination will be used as an example.

[0059] For example, the measuring optical system 100 includes a light-emitting optical system 105 and a light-receiving optical system 120. In this embodiment, for example, the light-emitting optical system 105 includes a measuring light source 130 and an objective optical system 110. Of course, for example, the light-emitting optical system 105 may consist only of the measuring light source 130. For example, the light-receiving optical system 120 includes a light-receiving objective optical system 140 and a detector 121 such as a CCD.

[0060] For example, in this embodiment, the measurement optical system 100 emits measurement light from the measurement light source 130 and projects a spot-shaped measurement light onto the fundus of the eye E through the center of the pupil of the eye E via the objective optical system 110. For example, the measurement optical system 100 uses the light-receiving objective optical system 140 to extract the fundus reflected light reflected from the fundus in a ring shape through the periphery of the pupil, and the ring-shaped fundus reflected image is detected by the detector 121. Note that the measurement optical system 100 is not limited to the above, and any measurement optical system having a light-emitting optical system that projects measurement light emitted from the measurement light source toward the fundus of the eye of the subject, and a light-receiving optical system that receives the reflected light obtained by the reflection of the measurement light at the fundus with a detector, is acceptable.

[0061] For example, the objective optical system 110 includes a relay lens 111, a hole mirror 112, and an objective lens 113, all positioned on the optical axis L5 of the light projection optical system 105. For example, the measurement light source 130 is also positioned on the optical axis L5 of the light projection optical system 105. For example, the measurement light source 130 is conjugate to the fundus of the eye under examination, and the hole portion of the hole mirror 112 is conjugate to the pupil.

[0062] For example, the light-receiving objective optical system 140 shares the objective lens 113 and hall mirror 112 of the objective optical system 110 and includes a relay lens 126, mirror 125, light-receiving aperture 124, collimator lens 123, and ring lens 122, which are positioned on the optical axis L6 of the light-receiving optical system 120 in the direction of reflection of the hall mirror 112. For example, the light-receiving aperture 124 and detector 121 are in a conjugate relationship with the fundus of the eye being examined. For example, the ring lens 122 consists of a ring-shaped lens portion and a light-shielding portion with a light-shielding coating applied to the area other than the lens portion, and is in an optically conjugate positional relationship with the pupil of the eye being examined. For example, the output from the detector 121 is input to the control unit 60. In this embodiment, for example, the optical axis L6 of the light-receiving optical system 120 is made coaxial with the optical axis L5 of the light-emitting optical system 105 by the hall mirror 112. Of course, for example, the optical axis L6 of the light-receiving optical system 120 and the optical axis L5 of the light-emitting optical system 105 may not be coaxial.

[0063] In the above configuration, the measurement light emitted from the measurement light source 130 passes through the relay lens 111, the hall mirror 112, and the objective lens 113 before irradiating the beam splitter 150. For example, the measurement light irradiated by the beam splitter 150 is reflected by the beam splitter 150 toward the eye under examination E. The measurement light reflected toward the eye under examination E forms a spot-shaped point light source image on the fundus of the eye under examination E via the eye examination window 43 of the eye refractive power measurement unit 5 and the optical members placed in the eye examination window (for example, the optical members of the lens disk 50 described later). That is, the measurement light is irradiated onto the eye under examination along the optical axis L5 of the light projection optical system 105.

[0064] For example, a point light source image projected onto the fundus of the eye under examination is reflected and scattered, exiting the eye E, reflected by the beam splitter 150, and focused by the objective lens 113. The reflected light focused by the objective lens 113 is reflected by the hall mirror 112 towards the relay lens 126, and then, via the relay lens 126 and mirror 125, is focused again at the position of the light-receiving aperture 124. The reflected light focused at the light-receiving aperture 124 is then projected onto the detector 121 by the collimator lens 123 and ring lens 122 to form a link-shaped image.

[0065] <Ocular refractive power measurement unit (corrective optical system)> Figure 4 is a schematic diagram of the eye refractive power measurement unit 40. The eye refractive power measurement unit 40 subjectively measures the refractive power of the eye E being examined. The eye refractive power measurement unit 40 is also used as a corrective optical system. The corrective optical system is placed in the optical path of the light projection optical system 30 and changes the optical properties of the target light beam. For example, the eye refractive power measurement unit 40 includes a forehead rest 41, a lens unit 42, an examination window 43, a moving unit 44, etc.

[0066] The forehead rest 41 fixes the eye E to a predetermined examination position by pressing it against the subject's head, and maintains a constant distance from the eye E to the examination window 43. The lens unit 42 has a pair of left and right lens units 42L and 42R. The lens unit 42 has an examination window 43 (left examination window 43L and right examination window 43R).

[0067] The moving unit 44 adjusts the distance between the left lens unit 42L and the right lens unit 42R, and the convergence angle (inward angle) between the left lens unit 42L and the right lens unit 42R. For example, the moving unit 44 adjusts the distance between the left lens unit 42L and the right lens unit 42R by driving the drive unit 45 (left drive unit 45L and right drive unit 45R). Also, for example, the moving unit 44 adjusts the convergence angle between the left lens unit 42L and the right lens unit 42R by driving the drive unit 46. For detailed configuration of the moving unit 44, please refer to, for example, Japanese Patent Application Publication No. 2004-329345.

[0068] Figure 5 is a schematic diagram of the lens unit 42. Figure 5(a) is an internal configuration diagram of the lens unit 42. Figure 5(b) is a horizontal cross-sectional view of the lens unit 42. Note that Figures 5(a) and 5(b) show only the left lens unit 42L, and the right lens unit 42R is not shown. For example, the lens unit 42 includes a variable focus lens 61, a Stokes lens 62, and a lens disk 50.

[0069] The variable focus lens 91 is fixedly positioned within the lens unit 42. The variable focus lens 91 can generate a spherical refractive force that continuously changes within a predetermined range by adjusting the spherical refractive force according to the magnitude of the applied voltage and changing the focal position. For example, in this embodiment, a spherical refractive force of -5.00D to +5.00D can be generated.

[0070] The Stokes lens 92 is rotatably positioned within the lens unit 42. The Stokes lens 92 consists of two cylindrical lenses 92a and 92b. For example, the cylindrical lenses 92a and 92b are a positive cylindrical lens and a negative cylindrical lens with equal focal lengths. Alternatively, the cylindrical lenses 92a and 92b can be two positive cylindrical lenses with equal focal lengths.

[0071] The cylindrical lenses 92a and 92b are rotated independently around the optical axis L4 by the driving of the rotation mechanisms 54a and 54b, respectively. By changing the rotation angle of at least one of the cylindrical lenses 92a and 92b, and creating a difference in the axial angles of each cylindrical lens, a cylindrical refractive force that continuously changes within a predetermined range can be generated. For example, in this embodiment, a cylindrical refractive force of -10.00D to +10.00D can be generated. Furthermore, by changing the rotation angles of both cylindrical lenses 92a and 92b together while maintaining the difference in their axial angles (i.e., by changing the combined axial angle of cylindrical lenses 92a and 92b), the astigmatism axis angle that continuously changes within a predetermined range can be adjusted. For example, in this embodiment, the astigmatism axis angle can be adjusted from 1 degree to 180 degrees.

[0072] The lens disk 50 has an aperture (or a 0D lens) and multiple optical elements 51 on the same circumference. The lens disk 50 is rotated about the center of the disk by the drive unit 52. In addition, each optical element 51 is rotated about the optical axis L4 by the drive unit 53. As a result, the desired optical element 51 is switched and positioned in the inspection window 43 at the desired angle.

[0073] For example, in this embodiment, a first auxiliary lens disc 50a and a second auxiliary lens disc 50b are provided. The first auxiliary lens disc 50a is provided with optical elements 51 such as a polarizing filter, a red filter / green filter, a dispersion prism, a Maddox lens, etc. The second auxiliary lens disc 50b is provided with optical elements 51 such as a clear lens, a rotary prism, an autocross cylinder lens, a first spherical lens 51a, a second spherical lens 51b, etc. For example, the clear lens is marked with a mark for aligning the interpupillary distance of the eye E under examination. For example, the first spherical lens 51a is a lens with a spherical power that corresponds to -10.00D when converted to the position of eyeglasses. For example, the second spherical lens 51b is a lens with a spherical power that corresponds to +10.00D when converted to the position of eyeglasses. For example, the spherical refractive powers of the first spherical lens 51a and the second spherical lens 51b are greater than a predetermined range of the spherical refractive power of the variable focus lens 61.

[0074] <Adjustment range of spherical refractive power> In this embodiment, when the variable focus lens 91 is combined with either the first spherical lens 51a or the second spherical lens 51b, the range of spherical refractive power that can be adjusted by the variable focus lens 91 alone can be expanded. For example, by setting the variable focus lens 91 to one of the ranges from 0.0D to -5.00D and combining it with the first spherical lens 51a (-10.00D), a spherical refractive power of -10.00D to -15.00D can be generated. For example, by setting the variable focus lens 91 to one of the ranges from 0.0D to +5.00D and combining it with the second spherical lens 51b (+10.00D), a spherical refractive power of +10.00D to +15.00D can be generated.

[0075] In other words, in this embodiment, a spherical refractive power of -5.00D to +5.00D can be seamlessly generated using only a variable focus lens. Furthermore, by placing a first spherical lens 51a or a second spherical lens 51b in the inspection window 43 in addition to the variable focus lens 91, a spherical refractive power of -10.00D to -15.00D and a spherical refractive power of +10.00D to +15.00D can be seamlessly generated. Therefore, overall, a spherical refractive power of -15.00D to +15.00D can be seamlessly generated.

[0076] For example, the amount of spherical correction of the eye under examination E, the spherical refractive power of the variable focus lens 91, and the spherical refractive power of the first spherical lens 51a and the second spherical lens 51b may be pre-associated. For example, if the amount of spherical correction of the eye under examination E exceeds the spherical refractive power that can be adjusted by the variable focus lens 91, the first spherical lens 51a and the second spherical lens 51b may be pre-associated to generate spherical refractive power (in other words, to position the first spherical lens 51a or the second spherical lens 51b). As an example, a reference table or the like may be prepared in advance and stored in memory 75 to refer to the value of the spherical refractive power of the variable focus lens 91 and the value of the spherical refractive power of the first spherical lens 51a and the second spherical lens 51b based on the amount of spherical correction of the eye under examination E.

[0077] <Department Head> Figure 6 is a schematic diagram of the control system of the subjective optometry device 100. For example, the control unit 60 includes a CPU (processor), RAM, ROM, etc. For example, the CPU is responsible for controlling each component of the subjective optometry device 1. For example, RAM temporarily stores various types of information. For example, ROM stores various programs for controlling the operation of the subjective optometry device 100, as well as test target data, etc. Note that the control unit 60 may be composed of multiple control units (i.e., multiple processors).

[0078] The control unit 60 is connected to the speaker 3, display 11, examiner controller 70, non-volatile memory 80 (hereinafter referred to as memory 80), light source 91, detector 121, light source 130, etc. The control unit 60 is also connected to the drive unit of the holding unit 4, the drive unit of the near / far switching unit 34, the drive unit of the refractive power measurement unit 40 (drive units 45, 46, 52, 53), etc.

[0079] Memory 80 is a non-transient storage medium that can retain its contents even when the power supply is cut off. For example, memory 80 can be a hard disk drive, flash ROM, USB memory, etc.

[0080] <Control operation> The control operation of the subjective optometry device 100 having the above configuration will now be described. For example, the variable focus lens 91 of the subjective optometry device 100 in this embodiment can change the spherical refractive power seamlessly (without creating a seam). However, if the variable focus lens 91 deteriorates, it will not be able to change to the refractive power desired by the examiner, and the eye E under examination cannot be properly corrected. For this reason, the deterioration of the variable focus lens 91 is detected, and the variable focus lens 91 is calibrated as necessary.

[0081] In this embodiment, the measurement results obtained by objectively measuring the eye under test are used to specify the amount of correction required to correct the eye under test to 0D, which is the amount of change in the optical characteristics of the target light beam in the variable focus lens 91 (i.e., the refractive power of the variable focus lens 91). The control unit 60 controls the variable focus lens 91 based on the amount of correction required to correct the eye under test to 0D, and after the adjustment of the optical characteristics (refractive power) by the variable focus lens 91 is completed, the actual refractive power of the variable focus lens 91 is acquired as change information indicating the change in the optical characteristics of the target light beam by the variable focus lens 91, thereby detecting whether deterioration has occurred in the variable focus lens 91. This will be explained in detail below.

[0082] <Alignment of the eye under examination> First, the examiner operates the examiner controller 70 to select a switch (not shown) to lower the eye refractive power measurement unit 40. For example, the control unit 60 drives the drive unit of the holding unit 4 based on the output of the operation signal from the examiner controller 70. For example, this moves the eye refractive power measurement unit 40 to the examination position (see Figure 1(b)), and the eye refractive power measurement unit 40 is positioned on optical axes L4, L5, and L6.

[0083] Next, the examiner aligns the eye E to the refractive power measurement unit 40. For example, the examiner instructs the subject to place their face against the forehead rest 41 and look through the examination window 43. The subject looks through the examination window 43 in accordance with the examiner's instructions. The examiner adjusts the position of the forehead rest 41 by operating a forehead rest adjustment knob (not shown) so that the corneal vertex distance VD of the eye is a predetermined distance (for example, 12 mm). The examiner also inputs the interpupillary distance PD of the eye E, which has been measured in advance, by operating the examiner controller 70. For example, the control unit 60 drives the drive unit 45 to adjust the distance between the left and right lens units 42 and changes the distance of the examination window 43 to match the interpupillary distance PD of the eye E. This completes the alignment of the eye E.

[0084] <Acquisition of objective refractive power of the eye under examination> Next, the examiner obtains the objective refractive power of the eye E under examination. For example, the objective refractive power is obtained by obtaining the objective refractive power measured in advance using an objective refractive power measuring device. For example, the examiner operates the examiner controller 70 to input the subject ID and operates a predetermined switch. For example, the control unit 60 outputs an operation signal to the objective refractive power measuring device to transmit the objective refractive power associated with the subject ID, based on the input signal from the switch. For example, when the control unit of the objective refractive power measuring device receives the subject ID from the subjective optometry device 100, it retrieves the objective refractive power corresponding to the subject ID from memory and transmits it to the subjective optometry device 100. The control unit 60 of the subjective optometry device 100 receives the objective refractive power transmitted from the objective refractive power measuring device. This allows the objective refractive power of the eye E under examination to be obtained. For example, in this embodiment, we will consider the case where the first objective refractive power of the eye E under examination is a first spherical refractive power of -2.0D, a first cylindrical refractive power of 0.0D, and a first astigmatism axis angle of 0 degrees.

[0085] <Setting the correction amount for the eye being examined> For example, when the control unit 60 obtains the objective refractive power of the eye under examination E, it sets the amount of correction to correct the eye under examination E based on the objective refractive power. Also, for example, the control unit 60 controls at least one of the variable focus lens 91, Stokes lens 92, lens disc 50, etc., based on the amount of correction to correct the eye under examination E. In this embodiment, in order to correct the eye under examination E to 0.0D, the spherical correction amount is set to -2.0D, the cylindrical correction amount to 0.0D, and the astigmatism axis correction amount (astigmatism axis correction angle) to 0 degrees, based on the objective refractive power. The control unit 60 controls the variable focus lens 91 to apply a predetermined voltage so that the spherical refractive power of the variable focus lens 91 is -2.0D. Also, the control unit 60 controls the Stokes lens 92 to rotate the cylindrical lens 92a and cylindrical lens 92b so that the cylindrical refractive power of the Stokes lens 92 is 0.0D and the astigmatism axis angle is 0 degrees. Furthermore, the control unit 60 controls the lens disc 50 to align its opening with the examination window 43. As a result, if the variable focus lens 91 has not deteriorated, the spherical refractive power of the variable focus lens 91 is adjusted to -2.0D, and consequently the eye E under examination is corrected to 0.0D.

[0086] <Acquiring the actual refractive power of a variable focus lens> Next, the examiner objectively measures the refractive power of the eye E being examined using the measuring optical system 100 provided in the subjective optometry device 100. For example, the examiner operates the examiner controller 70 and selects a switch to start the measurement. For example, the control unit 60 emits measurement light from the measurement light source 130 of the light projection optical system 105 based on the output of the operation signal from the examiner controller 70. In this case, the measurement light is projected onto the fundus of the eye E being examined via the objective optical system 110, beam splitter 150, and refractive power measurement unit 40. The reflected light of the measurement light reflected from the fundus is detected as a ring-shaped image (ring image) by the detector 121 of the light receiving optical system 120 via the refractive power measurement unit 40, beam splitter 150, and light receiving optical system 120.

[0087] For example, the output signal from the detector 121 is stored in the memory 80 as image data (measured image). Subsequently, the control unit 60 performs image analysis on the ring image stored in the memory 80 to determine the refractive power values ​​in each meridian direction, and then performs predetermined processing on these refractive powers to obtain the refractive power of the eye under examination. Here, since the measurement light and reflected light in the measurement optical system 100 pass through the eye refractive power measurement unit 40 (variable focus lens 91), the second objective eye refractive power is obtained with the spherical refractive power of the variable focus lens 91 reflected. For example, in this embodiment, we take the case where the second objective eye refractive power of the eye under examination E is obtained as a second spherical refractive power of -0.25D, a second cylindrical refractive power of 0.0D, and a second astigmatism axis angle of 0 degrees.

[0088] For example, the control unit 60 determines the actual spherical refractive power of the variable focal lens 91 by comparing the refractive power of the first objectively observed eye with the refractive power of the second objectively observed eye. More specifically, it determines the difference between the first and second spherical refractive powers and adds this difference to the amount of spherical correction set to correct the eye being examined, thereby determining the actual spherical refractive power of the variable focal lens 91. For example, in this embodiment, if the variable focal lens 91 is not deteriorated, it is driven appropriately, so the eye being examined E is corrected to 0.0D, and the second spherical refractive power becomes 0.0D. However, in this embodiment, the second spherical refractive power is -0.25D, indicating a discrepancy between the first and second spherical refractive powers. The control unit 60 calculates the difference (-0.25D) between the first spherical refractive power and the second spherical refractive power, and adds this difference to the spherical correction amount (-2.0D) set to correct the eye under examination. This allows the control unit to determine that the actual spherical refractive power of the variable focus lens 91 is -2.25D, not -2.0D.

[0089] <Comparison of Actual Refractive Power and Calibration Values ​​of Variable Focal Length Lenses> Figure 7 illustrates the correspondence between the amount of spherical correction set to correct the eye under examination and the calibration value. For example, in this embodiment, a lookup table 81 that associates the amount of spherical correction set to correct the eye under examination with the calibration value is created in advance by conducting experiments or simulations and stored in memory 80. That is, the calibration value for each amount of spherical correction set to correct the eye under examination is stored in memory 80 as a lookup table. For example, the calibration value may be shown as the allowable range of the actual refractive power of the variable focus lens 91.

[0090] The control unit 60 refers to the lookup table 81 and obtains a calibration value corresponding to the spherical correction amount (-2.0D) set to correct the eye under examination. Here, the calibration value is set to range from -1.94D to -2.06D, with an acceptable range of ±0.06D. Next, the control unit 60 compares the actual spherical refractive power (-2.25D) of the variable focus lens 91 with the calibration value (-1.95D to -2.05D). For example, it determines whether the actual spherical refractive power of the variable focus lens 91 is below the upper limit of the calibration value and above the lower limit of the calibration value. This allows, for example, detection of whether the actual refractive power of the variable focus lens 91 falls within the calibration value.

[0091] <Notification of Calibration of Variable Focus Lenses> For example, the control unit 60 may display the comparison result, obtained by comparing the actual spherical refractive power of the variable focus lens 91 with the calibration value, on the monitor 72 of the examiner controller 70. For example, if the actual spherical refractive power of the variable focus lens 91 falls within the calibration value, the control unit 60 may consider that the variable focus lens 91 does not need to be calibrated and display a message to that effect. Alternatively, for example, if the actual spherical refractive power of the variable focus lens 91 does not fall within the calibration value, the control unit 60 may consider that the variable focus lens 91 needs to be calibrated and display a message to that effect.

[0092] In this embodiment, the actual spherical refractive power of the variable focus lens 91 is -2.25D, which falls outside the calibration range of -1.95D to -2.05D. Therefore, a message indicating that calibration of the variable focus lens 91 should be started is displayed on the monitor 72. Along with this message, an operation button for the examiner to press upon confirming the message is also displayed on the monitor 72. For example, when the examiner confirms the message and presses the operation button, the calibration of the variable focus lens is automatically performed.

[0093] <Performing calibration of a variable focus lens> For example, the control unit 60 performs calibration of the variable focus lens 91 based on input signals from the operation buttons. For example, the control unit 60 obtains the drive amount of the variable focus lens 91 based on the difference between the actual spherical refractive power of the variable focus lens 91 and the calibration value. For example, in this embodiment, the drive amount of the variable focus lens 91 is obtained as the applied voltage (i.e., the applied voltage correction amount) that is additionally applied to the variable focus lens 91. For example, the control unit 60 obtains the applied voltage correction amount using a lookup table that associates the difference between the actual spherical refractive power of the variable focus lens 91 and the calibration value with the applied voltage applied to the variable focus lens 91. For example, such a lookup table may be pre-set from experiments or simulations and stored in memory 80. For example, the control unit 60 calls up the lookup table and obtains the applied voltage correction amount corresponding to the difference between the actual spherical refractive power of the variable focus lens 91 and the calibration value.

[0094] For example, the control unit 60 may calibrate the variable focus lens 91 by adding an applied voltage obtained as a correction amount to a predetermined applied voltage for adjusting the spherical refractive power of the variable focus lens 91, based on the amount of spherical correction for correcting the eye E under examination. For example, regardless of the amount of spherical correction for correcting the eye E under examination, the applied voltage obtained as a correction amount may be uniformly added to the predetermined applied voltage for adjusting the spherical refractive power of the variable focus lens 91.

[0095] In this embodiment, the variable focus lens 91 may be calibrated by adding a correction voltage obtained in addition to a predetermined applied voltage that results in a spherical refractive power of -2.0D. For example, even if the variable focus lens 91 is degraded and the actual spherical refractive power of the variable focus lens 91 is adjusted to -2.25D despite setting the spherical correction amount to -2.0D to correct the eye E under examination, the actual spherical refractive power of the variable focus lens 91 will be correctly adjusted to -2.0D by performing the calibration of the variable focus lens 91 as in this embodiment.

[0096] As described above, for example, the subjective optometry device of this embodiment includes a variable focal length member, a correction means that changes the optical properties of a target light beam emitted from a target presentation means by the variable focal length member, a setting means that sets the amount of change in optical properties by the correction means, a correction control means that controls the variable focal length member in the correction means based on the amount of change set by the setting means, an acquisition means that acquires change information indicating the change in optical properties by the variable focal length member after the correction control means controls the variable focal length member based on the amount of change and the setting of the change in optical properties is completed, a comparison processing means that compares the change information acquired by the acquisition means with a calibration value for calibrating the deterioration of the variable focal length member, and a calibration control means that executes control for calibrating the variable focal length member based on the comparison result by the comparison processing means. As a result, even if deterioration occurs in the variable focal length member due to aging or the like, the accuracy of the refractive power of the variable focal length member can be maintained.

[0097] Furthermore, for example, in the subjective optometry device of this embodiment, the calibration control means performs calibration of the variable focus member by changing the refractive power of the variable focus member controlled by the correction control means as a control for performing calibration of the variable focus member. For example, calibration of the variable focus member may be performed by changing the refractive power of the variable focus member by adjusting the drive amount of the variable focus member. As an example, calibration may be performed by adjusting the applied voltage so that the correct refractive power is generated when a predetermined applied voltage is applied to the variable focus member. This makes it possible to maintain the accuracy of the refractive power of the variable focus member.

[0098] Furthermore, for example, in the subjective optometry device of this embodiment, the calibration control means outputs calibration-related information regarding the calibration of the variable focus member as control for performing calibration of the variable focus member. For example, the calibration-related information may include the amount of change in the refractive power of the variable focus member due to aging, information indicating that calibration of the variable focus member is necessary, etc. For example, by having the calibration control means output calibration-related information for the examiner to confirm, the examiner can understand that calibration of the variable focus member is being performed and decide whether or not to perform calibration of the variable focus member, thus making it easier to perform calibration of the variable focus member. Also, for example, by having the calibration control means output calibration-related information directed to the subjective optometry device, the amount of drive of the variable focus member can be automatically adjusted, making it easier to perform calibration of the variable focus member.

[0099] Furthermore, in the subjective optometry device of this embodiment, for example, the calibration value for calibrating the deterioration of the variable focus member is a different value corresponding to the amount of change set by the setting means. For example, the larger the absolute value of the change in optical characteristics due to the variable focus member (i.e., the higher the magnitude of the change in optical characteristics), the greater the possibility that the actual change in refractive power will be when the variable focus member has changed over time. For this reason, if a uniform calibration value is set regardless of the amount of change in optical characteristics due to the variable focus member, the calibration value will be large for values ​​with small changes in optical characteristics, which may result in improper calibration. Also, the calibration value will be small for values ​​with large changes in optical characteristics, which may necessitate frequent calibration. Therefore, by setting different calibration values ​​for each amount of change in optical characteristics due to the corrective means, it is possible to perform calibration at the appropriate timing, reduce the frequency and effort required, and easily calibrate the variable focus member.

[0100] Furthermore, for example, the subjective ophthalmography device of this embodiment includes a detection means for detecting a light beam emitted from a light source and passing through a variable focus member, and an acquisition means for acquiring change information based on the detection result by the detection means. For example, the detection result obtained by passing the light beam from the light source through the variable focus member differs depending on whether the variable focus member is in a non-deteriorated state or a deteriorated state, so by providing such a configuration, change information of the variable focus member can be easily acquired.

[0101] Furthermore, in the subjective optometry device of this embodiment, for example, the detection means detects the reflected light beam that is irradiated from the light source toward the object to be examined and reflected by the object to be examined, and the acquisition means acquires change information based on the reflected light beam detected by the detection means. For example, the detection results obtained by the reflected light beam reflected by the object to be examined will differ depending on whether the variable focus member is in a non-deteriorated state or a deteriorated state. As an example, the shape of the pattern image (ring image in this embodiment) obtained by detecting the reflected light beam from the fundus of the eye to be examined will differ. For example, by utilizing the difference in the shape of the pattern image, the refractive power of the optical characteristics can be determined as change information indicating a change in optical characteristics. By having such a configuration, the change information of the variable focus member (in this case, the refractive power of the optical characteristics) and the calibration value can be easily compared and processed.

[0102] <Example of transformation> In this embodiment, a configuration has been described as displaying a message indicating that calibration of the variable focus lens 91 should be automatically started as a result of comparing the actual spherical refractive power of the variable focus lens 91 with the calibration value, but the embodiment is not limited to this. For example, guidance information to prompt the examiner to calibrate the variable focus lens 91 may be displayed as a result of comparing the actual spherical refractive power of the variable focus lens 91 with the calibration value. As an example, the guidance information may be a message informing the examiner that calibration of the variable focus lens 91 is necessary, a message asking the examiner whether or not to perform calibration of the variable focus lens 91, a message indicating the examiner's next action, a guidance mark indicating the position of the button to select for the examiner to perform the next action, etc.

[0103] For example, the subjective optometry device of this embodiment can output calibration-related information regarding the calibration of the variable focus member as a control for performing calibration of the variable focus member. This calibration-related information is guidance information to prompt the examiner to calibrate the variable focus member. For example, the examiner can easily decide whether or not to calibrate the variable focus member by checking the guidance information.

[0104] In this embodiment, a configuration was described as in which a calibration value (in other words, an acceptable range of the actual refractive power of the variable focus lens 91) is set for each spherical correction amount set to correct the eye under examination, but the embodiment is not limited to this. For example, such a calibration value may be set uniformly regardless of the spherical correction amount set to correct the eye under examination. In other words, even if the spherical correction amount set to correct the eye under examination is different, the same calibration value (the same acceptable range) may always be applied to the actual refractive power of the variable focus lens 91.

[0105] In this embodiment, a configuration in which the allowable range of the actual refractive power of the variable focus lens 91 is set as a calibration value for calibrating the deterioration of the variable focus lens 91 has been described as an example, but the embodiment is not limited to this. For example, a predetermined spherical correction amount (i.e., a predetermined threshold) in either the positive or negative direction, based on the spherical correction amount set to correct the eye under examination, may be set as the calibration value. In this case, the control unit 60 may compare the actual refractive power of the variable focus lens 91 with the predetermined threshold (calibration value) and obtain as a comparison result whether or not the actual refractive power of the variable focus lens 91 exceeds the predetermined threshold. Alternatively, for example, the same value as the spherical correction amount set to correct the eye under examination may be set as the calibration value. In this case, the control unit 60 may compare the actual refractive power of the variable focus lens 91 with the spherical correction amount (calibration value) set to correct the eye under examination and obtain as a comparison result whether or not the actual refractive power of the variable focus lens 91 matches the spherical correction amount.

[0106] In this embodiment, a configuration for comparing the actual spherical refractive power of the variable focus lens 91 with a calibration value for calibrating the variable focus lens 91 has been described as an example, but the embodiment is not limited to this. For example, as a comparison process between the actual spherical refractive power of the variable focus lens 91 and the calibration value, the amount of deviation between the spherical correction amount set to correct the eye under examination and the actual spherical refractive power of the variable focus lens 91 may be determined, and this amount of deviation may be compared with the calibration value. In this case, an allowable range for the amount of deviation may be provided as the calibration value.

[0107] For example, in this embodiment, the spherical correction amount set to correct the eye under examination is -2.0D, and the actual spherical refractive power of the variable focus lens 91 is -2.25D. Therefore, first, the control unit 60 determines these deviation amounts (-0.25D). Next, the control unit 60 obtains an acceptable range for the deviation amount as a calibration value corresponding to the spherical correction amount (-2.0D) set to correct the eye under examination. As an example, the calibration value may be from -0.06D to +0.06D (i.e., the acceptable range may be ±0.06D). Next, the control unit 60 compares the deviation amount (-0.25D) with the calibration value (-0.06D to +0.06D) and detects whether the deviation amount is less than or equal to the upper limit of the calibration value and greater than or equal to the lower limit of the calibration value. For example, based on the comparison result from such a comparison process, control may be executed to calibrate the variable focus lens 91.

[0108] For example, in the subjective optometry device of this embodiment, the comparison processing means performs a comparison process between change information indicating the change in optical characteristics due to the variable focus member and a calibration value for calibrating the deterioration of the variable focus member. This comparison process involves comparing deviation information indicating the difference between the amount of change and the change information with the calibration value. For example, due to deterioration caused by aging, the actual amount of change in optical characteristics (change information) may differ from the amount of change in optical characteristics set to be changed by the variable focus member, resulting in a discrepancy between the amount of change and the change information. Therefore, by using deviation information in the comparison process, for example, the presence or absence of a discrepancy can be easily detected, and as a result, the variable focus member can be calibrated with high accuracy.

[0109] In this embodiment, a configuration in which the actual refractive power of the variable focus lens 91 is obtained by detecting the light beam emitted from the light source 130 and passed through the variable focus lens 91 has been described as an example, but the embodiment is not limited to this. More specifically, a configuration in which the actual refractive power of the variable focus lens 91 is obtained by using the measurement optical system 100 to irradiate the fundus of the eye under examination E with a measurement light beam passed through the variable focus lens 91, and detecting the reflected light beam of the measurement light beam from the fundus via the variable focus lens 91 has been described as an example, but the embodiment is not limited to this. For example, a display 11 may be used as a light source, and the actual refractive power of the variable focus lens 91 may be obtained by detecting the target light beam from the display 11 and passed through the variable focus lens 91. In this embodiment, a detection unit for detecting the test target or pattern image displayed on the display 11 is provided in the lens unit 42, and an example is given in which the amount of blur that reflects the actual refractive power of the variable focus lens 91 is obtained based on the detected test target or pattern image.

[0110] Figure 8 shows the detection unit 200 positioned on the lens unit 42 to detect the test target. Note that Figure 8 only shows the left lens unit 42L, and the right lens unit 42R is not shown. For example, the detection unit 200 is positioned in the standby position shown by the dotted line in Figure 8, and can be moved to the detection position shown by the solid line in Figure 8 only when necessary, such as when checking whether the variable focus lens 91 is degraded. For example, the detection unit 200 is used to detect the test target or pattern image displayed on the display 11. For example, the detection unit 200 is positioned in front of the lens unit 42 (i.e., on the side of the eye E being examined, opposite to the presentation window 3). For example, the detection unit 200 includes a drive unit 55, a plane mirror 93, an image sensor 94, etc.

[0111] For example, the drive unit 55 moves the detection unit 200 relative to the lens unit 42. This switches the detection unit 200 between a standby position for subjective examination of the eye E and a detection position for detecting the test target on the display 11. For example, when subjective measurement of the eye E is performed, the detection unit 200 can be moved to the standby position shown by the dotted line in Figure 8, allowing the examination window 43 to be positioned in front of the eye E. For example, when checking for deterioration of the variable focus lens 91, the detection unit 200 can be moved to the detection position shown by the solid line in Figure 8, allowing the target light beam from the display 11 to be guided to the image sensor 94. For example, the plane mirror 93 is positioned in front of the variable focus lens 91 (on the side of the eye E). The plane mirror 93 may also be configured to use a prism, beam splitter, etc. For example, the image sensor 94 captures an image of the target light beam from the display 11. For example, when the detection unit 200 is moved to the detection position, the target light beam emitted from the display 11 passes through the optical axes L1 to L4 (see Figure 2), enters the plane mirror 93, is reflected in the direction of the optical axis L7, and is imaged by the image sensor 94. Note that the detection unit 200 in this embodiment is just one example; any configuration that can capture the target light beam emitted from the display 11 through the variable focus lens 91 by being positioned on the optical axis L4 on the side of the eye E under examination is acceptable.

[0112] For example, the examiner operates the examiner controller 70 to select a switch (not shown) to move the detection unit 200 to the detection position. For example, the control unit 60 drives the drive unit 55 based on the operation signal from the examiner controller 70 to move the detection unit 200 to the detection position. Alternatively, for example, the examiner operates the examiner controller 70 to specify the amount of spherical correction to change the spherical refractive power of the variable focus lens 91. Here, as an example, a spherical correction amount of -5.0D is specified. For example, the control unit 60 applies a predetermined voltage to the variable focus lens 91 that corresponds to the spherical correction amount specified by the examiner, based on the operation signal from the examiner controller 70. As a result, if the variable focus lens 91 is not deteriorated, the spherical refractive power of the variable focus lens 91 is adjusted to -5.0D.

[0113] For example, when a predetermined voltage is applied to the variable-focus lens 91, the control unit 60 generates a trigger signal to capture the target light beam from the display 11. Also, for example, based on the trigger signal, the control unit 60 causes the image sensor 94 to capture an image of the target light beam. For example, in this embodiment, a point cloud target is displayed on the display 11, and a point cloud target image is captured via the variable-focus lens 91. For example, such a point cloud target image is stored in the memory 70.

[0114] For example, the control unit 60 detects the amount of blur of the target point cloud image relative to the reference point cloud image, based on a reference point cloud image (reference image) and a target point cloud image (target image) captured using the detection unit 200. For example, a corresponding reference image is stored in the memory 80 for each spherical refractive power of the variable focus lens 91. Therefore, for example, the control unit 60 processes the reference image when the spherical refractive power of the variable focus lens 91 is -5.0D and the target image actually acquired. As an example, the amount of edge detection in the reference image and the amount of edge detection in the target image are determined, and the amount of blur of the target image relative to the reference image is determined by performing difference processing on each edge detection amount. Note that if the variable focus lens 91 is not degraded and a predetermined applied voltage is correctly applied to the variable focus lens 91, the reference image and the target image will be identical (approximately identical), and the amount of blur of the target image relative to the reference image will be 0.

[0115] For example, when the above amount of blur is obtained, the control unit 60 compares the amount of blur of the target image with a calibration value for calibrating the degradation of the variable focus lens 91. For example, the calibration value may be set as a predetermined threshold for the amount of blur of the target image. For example, the control unit 60 may detect whether the amount of blur of the target image exceeds the calibration value (threshold) by calculating the difference between the amount of blur of the target image and the calibration value. Alternatively, for example, the control unit 60 may notify whether or not the variable focus lens 91 has been calibrated, perform calibration of the variable focus lens 91, etc., based on the comparison result obtained by comparing the amount of blur of the target image and the calibration value. As an example, the comparison result may be displayed on the monitor 72 of the examiner controller 70. As another example, the variable focus lens 91 may be calibrated by obtaining an additional applied voltage (i.e., a correction amount for the applied voltage) based on the comparison result. In this case, the amount of correction for the applied voltage can be determined using a lookup table that associates the difference between the amount of blur in the target image and the calibration value with the applied voltage to the variable focus lens 91, and the variable focus lens 91 can be calibrated based on the amount of correction for the applied voltage.

[0116] For example, in the subjective optometry device of this embodiment, the light source is a target presentation means, the detection means detects the target light beam emitted from the target presentation means and transmitted through a variable focus member, and the acquisition means acquires change information based on the detection result of the target light beam by the detection means. For example, by using a target presentation means as a light source, an image of an examination target presented on the target presentation means can be obtained as a detection result obtained by transmitting the light beam from the target presentation means through the variable focus member. The appearance of such an image will be detected differently depending on whether the variable focus member is in a non-degraded state or a deteriorated state. Therefore, by having such a configuration, change information of the variable focus member can be easily acquired.

[0117] In this embodiment, a configuration in which the amount of blur reflecting the actual refractive power of the variable focus lens 91 is obtained by detecting the target image on the display 11 with the detection unit 200 was described as an example, but the embodiment is not limited to this. For example, the anterior segment of the eye E under examination may be illuminated, and the anterior segment image captured of the anterior segment of the eye E under examination may be detected by the detection unit 200 to obtain the amount of blur reflecting the actual refractive power of the variable focus lens 91.

[0118] Figure 9 shows the detection unit 200 positioned on the lens unit 42 to detect an anterior segment image. Note that Figure 9 only shows the left lens unit 42L, and the right lens unit 42R is not shown. For example, the detection unit 200 can be attached to the lens unit 42 only when necessary, such as when checking whether the variable focus lens 91 is degraded. Of course, the detection unit 200 may also be placed in a standby position and moved to the detection position only when necessary. For example, the detection unit 200 is used to image the anterior segment of the eye E under examination. For example, the detection unit 200 is positioned on the rear surface of the lens unit 42 (i.e., on the side of the presentation window 3, opposite to the eye E under examination). The internal configuration of the detection unit 200 is the same as in Figure 8, and therefore the explanation is omitted.

[0119] In this configuration, an illumination unit (not shown) for illuminating the anterior segment of the eye E under examination may be provided along with the detection unit 200. For example, the illumination unit may include at least an illumination light source. For example, the illumination light source is positioned in front of the lens unit 42 (on the side of the eye E under examination). For example, it may be positioned around the examination window 43. For example, the illumination light source may be turned on when the detection unit 200 is mounted (or when the detection unit 200 is moved to the detection position). For example, when the detection unit 200 is in the detection position, the illumination beam emitted from the illumination light source is reflected by the anterior segment of the eye E under examination, and this reflected beam passes through the optical axis L4, enters the half mirror 93, is reflected in the direction of the optical axis L8, and is imaged by the image sensor 94.

[0120] For example, the examiner operates the examiner controller 70 to specify the amount of spherical correction to change the spherical refractive power of the variable focus lens 91. Here, as an example, the spherical correction amount of 0.0D is specified. For example, the control unit 60 stops applying the voltage based on the output of the operation signal from the examiner controller 70 so that the spherical correction amount specified by the examiner is achieved. As a result, if the variable focus lens 91 has not deteriorated, the spherical refractive power of the variable focus lens 91 is adjusted to 0.0D. For example, when the application of voltage to the variable focus lens 91 is stopped, the control unit 60 issues a trigger signal to capture an anterior segment image. Also, for example, when the trigger signal is issued, the control unit 60 causes the image sensor 94 to capture an anterior segment image. For example, the anterior segment image thus captured is stored in the memory 80.

[0121] For example, the control unit 60 detects the amount of blur in the target image relative to the reference image based on a reference anterior segment image (reference image) and an anterior segment image of the target captured using the detection unit 200 (target image). For example, a corresponding reference image is stored in the memory 80 for each spherical refractive power of the variable focus lens 91. Therefore, for example, the control unit 60 performs image processing (such as edge detection) on the reference image when the spherical refractive power of the variable focus lens 91 is 0.0D and the actually acquired target image. For example, when the applied voltage to the variable focus lens 91 is stopped and the spherical refractive power of the variable focus lens 91 becomes 0.0D, the reference image and the target image become identical (or nearly identical), and the amount of blur in the target image relative to the reference image becomes 0. However, even when the applied voltage to the variable focus lens 91 is stopped, if the spherical refractive power of the variable focus lens 91 does not fully return to 0.0D, the amount of blur in the target image relative to the reference image can be obtained.

[0122] For example, when the above amount of blur is obtained, the control unit 60 compares the amount of blur of the target image relative to the reference image with a calibration value for calibrating the deterioration of the variable focus lens 91. As an example, the control unit 60 may detect whether the amount of blur of the target image exceeds the calibration value (a predetermined threshold) by calculating the difference between the amount of blur of the target image and the calibration value. Alternatively, for example, based on the comparison result obtained by comparing the amount of blur of the target image and the calibration value, the control unit 60 may notify whether or not the variable focus lens 91 has been calibrated, perform calibration of the variable focus lens 91, etc. For example, since the appearance of the anterior segment image is detected differently depending on whether the variable focus lens 91 is not deteriorated or is deteriorated, the state of the variable focus lens 91 may be determined using the anterior segment image.

[0123] Furthermore, when using an anterior segment image of the eye E under examination, the illumination light source of the illumination unit (not shown) may also serve as a unit for projecting bright spots onto the cornea of ​​the eye under examination. In this case, the image sensor 94 of the detection unit 200 can capture an anterior segment image in which bright spot images are projected onto the cornea. For example, the control unit 60 may process the reference image and the target image and determine the amount of blur of the target image relative to the reference image based on the bright spot images contained in each. For example, if multiple bright spot images are projected onto the cornea, the amount of blur of the target image relative to the reference image may be determined from the difference in the spacing between the bright spot images.

[0124] In this embodiment, a configuration was described as one in which the actual refractive power of the variable focus lens 91 is obtained by utilizing the image obtained by passing the fundus reflection light beam of the eye under examination, the corneal reflection light beam of the eye under examination, or the target light beam from the display 11 through the variable focus lens 91, but the embodiment is not limited to this. For example, the actual refractive power of the variable focus lens 91 may be obtained by utilizing the image obtained by passing the fundus reflection light beam of the eye under examination, the corneal reflection light beam of the eye under examination, or the target light beam from the display 11 through the variable focus lens 91 and a fixed lens. For example, the actual refractive power of the variable focus lens 91 may be obtained by canceling out the spherical refractive power of the variable focus lens 91 with the spherical refractive power of the fixed lens.

[0125] In this embodiment, the acquisition of the actual refractive power of the variable-focus lens 91 using the variable-focus lens 91 and a fixed lens will be described, using the case of obtaining a target image on the display 11 as an example. For example, in this embodiment, a point cloud target is displayed on the display 11, and a point cloud target image is captured through the variable-focus lens 91 and the fixed lens. For example, such a point cloud target image is stored in the memory 70. Of course, it can also be applied when obtaining a ring image or an anterior segment image. For example, in the eye refractive power measurement unit 40, the first auxiliary lens disk 50a or the second auxiliary lens disk 50b may be provided with a fixed lens as an optical element 51, having a predetermined spherical refractive power that falls within the range of spherical refractive power adjustable by the variable-focus lens 91. For example, since the fixed lens has a constant focal length and does not require the application of a voltage, it is less susceptible to the effects of aging and other factors. For example, in this embodiment, the spherical refractive power of the fixed lens is +5.0D.

[0126] For example, the examiner operates the examiner controller 70 to select a switch (not shown) to move the detection unit 200 to the detection position. For example, the control unit 60 drives the drive unit 55 based on the operation signal from the examiner controller 70 to move the detection element unit 200 to the detection position. Also, for example, once the movement of the detection unit 200 to the detection position is complete, the control unit 60 adjusts the spherical refractive power of the variable focus lens 91 to -5.0D and places the fixed lens in the inspection window 43. As a result, if the variable focus lens 91 is not deteriorated, the spherical refractive power of the variable focus lens 91 is canceled out by the spherical refractive power of the fixed lens, and a point cloud target image without blurring is captured. If the variable focus lens 91 is deteriorated, a point cloud target image will be captured that is blurred by the amount of spherical refractive power equivalent to the difference between the spherical refractive power of the variable focus lens 91 and the spherical refractive power of the fixed lens.

[0127] For example, the control unit 60 detects the amount of blur of the target point cloud target image (target image) captured using each detection unit 200 relative to a reference 0.0D point cloud target image (reference image) using image processing such as edge detection. Alternatively, the control unit 60 compares the amount of blur of the target image relative to the reference image with a calibration value for calibrating the degradation of the variable focus lens 91. As an example, the control unit 60 may detect whether the amount of blur of the target image exceeds the calibration value (a predetermined threshold) by calculating the difference between the amount of blur of the target image and the calibration value. Alternatively, the control unit 60 may, for example, notify whether the variable focus lens 91 has been calibrated, perform calibration of the variable focus lens 91, etc., based on the comparison result obtained by comparing the amount of blur of the target image and the calibration value. For example, the variable focus lens 91 may be calibrated by calculating the correction amount of the applied voltage using a lookup table that associates the difference between the amount of blur of the target image and the calibration value with the applied voltage to the variable focus lens 91.

[0128] Alternatively, the variable focus lens 91 may be calibrated by gradually changing the applied voltage to the variable focus lens 91 so that the amount of blur in the target image approaches the amount of blur in the reference image (i.e., the target image becomes blur-free). For example, the control unit 60 may gradually change the applied voltage to the variable focus lens 91 until the focus of the reference image and the focus of the target image are approximately the same. At this time, the amount of blur in the target image may be constantly detected and monitored. Furthermore, the control unit 60 may acquire the amount of applied voltage when the focus of the reference image and the focus of the target image are approximately the same, and calibrate the variable focus lens 91 based on this amount of applied voltage.

[0129] For example, in the subjective optometry device of this embodiment, the correction means has a fixed optical member that can be switched and positioned within the optical path of the target light beam, the detection means detects the light beam emitted from the light source and passing through the variable focus member and the fixed optical member, and the acquisition means acquires change information based on the detection result by the detection means. For example, the variable focus member adjusts its refractive power by applying a voltage and deteriorates due to aging, while the fixed optical member has a constant refractive power and is therefore less affected by deterioration due to aging. For this reason, by positioning the fixed optical member to counteract the refractive power adjusted by the variable focus member and detecting the light beam passing through the variable focus member and the fixed optical member, change information of the variable focus member can be easily acquired.

[0130] Furthermore, the subjective optometry device of this embodiment may be configured to optically change the presentation position of the test target relative to the eye E under examination. For example, the display 11 may be configured to move in the optical axis direction relative to the eye E under examination. In this case, instead of the fixed lens described above, the spherical refractive power of the variable focus lens 91 may be compensated for by moving the display 11 in the optical axis direction.

[0131] In this embodiment, the actual refractive power of the variable focus lens 91 was explained using the optical properties of the eye under examination E as an example, but the embodiment is not limited to this. For example, the actual refractive power of the variable focus lens 91 may be obtained by using the optical properties of a model eye. For example, since there are individual differences in the eye under examination E, errors may occur in the reference anterior segment image, etc. On the other hand, since the design conditions of the model eye are known, for example, the actual refractive power of the variable focus lens 91 can be obtained with greater accuracy by using the model eye.

[0132] In this embodiment, a configuration in which one value is set as the correction amount (refractive power to change the variable focus lens 91) for correcting the eye E under examination has been described as an example, but the embodiment is not limited to this. For example, multiple values ​​may be set as the correction amount for correcting the eye E under examination. For example, in this case, the spherical refractive power of the variable focus lens 91 may be obtained as at least two values ​​from among 0.0D, a positive value (e.g., +5.0D), and a negative value (e.g., -5.0D). For example, the control unit 60 may set these multiple values ​​as the refractive power to change the variable focus lens 91 and determine the actual refractive power for each of the multiple values. For example, this makes it easier to determine whether the variable focus lens 91 is degraded, and by calibrating the variable focus lens 91, the optical characteristics of the eye under examination can be obtained with accuracy.

[0133] Furthermore, if, for example, at least two values ​​are obtained as the correction amount for correcting the eye E under examination, the actual refractive power at a value different from the two values ​​may be approximately determined by performing interpolation (e.g., linear interpolation) using the actual refractive power for the two values. More specifically, for example, if the spherical refractive power of the variable focus lens 91 is set to two values, a positive value (+5.0D) and a negative value (-5.0D), the actual refractive power at at least one value between +5.0D and -5.0D can be approximately determined by performing interpolation using the actual refractive power for these values.

[0134] In the above, interpolation is performed using the actual refractive power for the correction amount to correct the eye E under examination. However, interpolation may also be performed using a correction amount for the applied voltage obtained based on the comparison result (e.g., difference) between these actual refractive powers and calibration values. That is, at least two values ​​may be obtained as the correction amount for the applied voltage to adjust the spherical refractive power of the variable focus lens 91. For example, in this case, the correction amounts for the applied voltage are obtained for when the spherical refractive power of the variable focus lens 91 is set to a positive value (+5.0D) and a negative value (-5.0D). For example, the control unit 60 may approximate the correction amount for the applied voltage at at least one value between +5.0D and -5.0D by performing interpolation using these two correction amounts for the applied voltage.

[0135] In this embodiment, a configuration for acquiring the objective refractive power of the eye under examination E using an objective refractive power device has been described as an example, but the embodiment is not limited to this. For example, the objective refractive power of the eye under examination E may be acquired using the measurement optical system 100 described above. In this case, the control unit 60 controls at least one of the variable focus lens 91, the Stokes lens 92, the lens disk 50, etc. For example, the spherical refractive power of the variable focus lens 91 is adjusted to 0.0D, the cylindrical refractive power of the Stokes lens 92 is adjusted to 0.0D, the astigmatism axis angle of the Stokes lens 92 is adjusted to 0 degrees, and the aperture of the lens disk 50 is aligned with the examination window 43. For example, in this state, the objective refractive power, which does not reflect the spherical refractive power of the variable focus lens 91, may be acquired by irradiating the eye under examination with a measurement light beam from the light source 130.

[0136] The subjective optometry device of this embodiment may be configured to change the spherical refractive power to 0.0D by adjusting the drive amount of the variable focus lens 91. More specifically, it may be configured to change the spherical refractive power to 0.0D by applying a voltage to the variable focus lens 91. In this case, the amount of spherical correction set to correct the eye under examination may include a state where the spherical refractive power is uncorrected (for example, a spherical refractive power of 0.0D). Of course, the amount of cylindrical correction set to correct the eye under examination may also include a state where the cylindrical refractive power is uncorrected (for example, a cylindrical refractive power of 0.0D). Furthermore, the amount of astigmatism axis correction set to correct the eye under examination may include a state where the astigmatism axis angle is uncorrected (for example, an astigmatism axis angle of 0 degrees).

[0137] Furthermore, the subjective eye examination device of this embodiment may be configured to periodically perform calibration of the variable focus lens 91. For example, a trigger signal may be issued periodically at any of the following timings to check whether calibration of the variable focus lens 91 is necessary: ​​when the device is started, when the measurement of the eye to be examined is completed, when a predetermined number of measurements have elapsed, or when a predetermined period of time has elapsed (e.g., one week, one month, etc.). The control unit 60 may perform control to perform calibration of the variable focus lens based on such a trigger signal. [Explanation of symbols]

[0138] 1 cabinet 2. Presentation window 3 speakers 30 Floodlight Optics 40. Refractive power measurement unit 43 Inspection window 60 Control Unit 70 Examiner's Controller 100 Self-aware eye examination device

Claims

1. A subjective ophthalmography device for subjectively measuring the optical properties of the eye being examined, A correction means having a variable focal length member, which changes the optical properties of the target light beam emitted from the target presentation means by the variable focal length member, A setting means for setting the amount of change in optical characteristics due to the correction means, A correction control means controls the variable focus member in the correction means based on the amount of change set by the setting means, The correction control means controls the variable focus member based on the amount of change, and after the setting of the change in optical characteristics is completed, an acquisition means acquires change information indicating the change in optical characteristics due to the variable focus member. A comparison processing means compares the change information acquired by the acquisition means with a calibration value for calibrating the deterioration of the variable focus member. Calibration control means that executes control for calibrating the variable focus member based on the comparison results from the comparison processing means, A subjective optometry device characterized by being equipped with the following features.

2. In the subjective eye examination device of claim 1, The calibration control means is characterized in that it performs calibration of the variable focus member by changing the refractive power of the variable focus member controlled by the correction control means as a control for performing calibration of the variable focus member.

3. In the subjective ophthalmoscopic device of claim 1 or 2, The calibration control means is characterized by outputting calibration-related information concerning the calibration of the variable focus member as a control for performing the calibration of the variable focus member.

4. In the subjective eye examination device of Claim 1, The comparison processing means is characterized in that, as the comparison processing between the change information and the calibration value, it performs the comparison processing of deviation information indicating the difference between the amount of change and the change information, and the calibration value, in a subjective optometry device.

5. In the subjective eye examination device of Claim 1, The system includes a detection means for detecting a light beam emitted from a light source and passing through the variable focus member, The acquisition means is characterized by acquiring the change information based on the detection result by the detection means.

6. A correction means comprising a variable focal length member, wherein the optical properties of the target light beam emitted from the target presentation means are changed by the variable focal length member, A subjective ophthalmography program used in a subjective ophthalmography device for subjectively measuring the optical properties of the eye being examined, This is executed by the processor of the aforementioned subjective optometry device, A setting step to set the amount of change in optical characteristics due to the correction means, The setting step includes a correction control step that controls the variable focus member in the correction means based on the amount of change set by the setting step, The correction control step controls the variable focus member based on the amount of change, and after the setting of the change in optical characteristics is completed, the acquisition step acquires change information indicating the change in optical characteristics due to the variable focus member. A comparison processing step compares the change information acquired in the acquisition step with a calibration value for calibrating the deterioration of the variable focus member. A calibration control step is performed to execute control for calibrating the variable focus member based on the comparison results from the comparison processing step, A subjective optometry program characterized by causing the subjective optometry device to perform the following.

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