Optometer and optometry program

Abstract

To provide an optometer and an optometry program which can smoothly perform subjective measurement.SOLUTION: An optometer comprises: target presentation means which emits a target light flux to a subject eye; and correction means which changes the optical characteristics of the target light flux, and subjectively measures the eye refractive power of the subject eye. The optometer also comprises: objective eye refractive power acquisition means which acquires the objective eye refractive power in objective measurement of the subject eye; first distance acquisition means which acquires a first distance to a reference position for lens attachment from a cornea apex of the subject eye in the objective measurement of the subject eye; second distance acquisition means which acquires a second distance to a reference position for lens attachment from the cornea apex of the subject eye in the subjective measurement of the subject eye; conversion means which converts the first objective eye refractive power based on the first distance into the second objective eye refractive power based on the second distance when the first distance is different from the second distance; and output means which outputs the second objective eye refractive power.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to an optometry apparatus and an optometry program for measuring the ocular refractive power of a subject's eye. [Background technology]

[0002] There is known an eye refractive power measuring device that projects a measuring light beam onto the fundus of the eye to be examined, receives the reflected light beam from the fundus with a light receiving element, and measures the objective eye refractive power of the eye to be examined based on the output of the light receiving element (Patent Document 1). For example, in the eye refractive power measuring device, the distance (corneal vertex distance) from the corneal vertex position of the eye to the lens wearing reference position assuming that the eye to be examined wears spectacles is set to a predetermined distance in advance.

[0003] In addition, a subjective eye examination device is known that uses an eye refraction measurement unit placed in front of the examinee's eye, places an optical element such as a spherical lens or a cylindrical (astigmatic) lens in an examination window of the eye refraction measurement unit, and presents a visual target to the examinee's eye through the optical element, thereby measuring the subjective eye refraction of the examinee's eye (Patent Document 2).

[0004] At the start of subjective measurement using the subjective optometry device, an initial correction value (i.e., an initial value) of the ocular refraction measuring unit is set based on the objective ocular refraction so that the subject's eye is corrected to a predetermined ocular refraction. Also, the corneal vertex distance of the subject's eye is adjusted to a fixed distance. In this state, the subjective measurement is carried out and the subjective ocular refraction is obtained. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2006-187483 A [Patent Document 2] Japanese Patent Application Publication No. 5-176893 Summary of the Invention [Problem to be solved by the invention]

[0006] However, when the corneal vertex distance in the objective measurement of the eye to be examined is different from the corneal vertex distance in the subjective measurement, even if an initial setting value based on the objective refractive power of the eye to be examined is set and a predetermined refractive power is added to the eye to be examined, the eye may be corrected with a refractive power different from the predetermined refractive power. For example, in such a case, there is a problem that the subjective measurement cannot be performed smoothly, such as taking time to obtain the subjective refractive power.

[0007] In view of the above problems, the present disclosure has as its technical object to provide an optometry device and an optometry program that can smoothly perform subjective measurement of a subject's eye. [Means for solving the problem]

[0008] In order to solve the above problems, the present disclosure is characterized by having the following configuration.

[0009] (1) An eye examination device according to a first aspect of the present disclosure has an eye target presenting means for emitting an eye target light beam toward an eye to be examined, and a corrective means for changing the optical characteristics of the eye target light beam, and is an eye examination device that subjectively measures the eye refractive power of the eye to be examined, and is characterized in that it is equipped with an objective eye refractive power acquisition means for acquiring the objective eye refractive power in an objective measurement of the eye to be examined, a first distance acquisition means for acquiring a first distance from the corneal vertex of the eye to a lens wearing reference position in the objective measurement of the eye to be examined, a second distance acquisition means for acquiring a second distance from the corneal vertex of the eye to a lens wearing reference position in the subjective measurement of the eye to be examined, a conversion means for converting the first objective eye refractive power based on the first distance into a second objective eye refractive power based on the second distance when the first distance and the second distance are different, and an output means for outputting the second objective eye refractive power.

[0010] (2) An eye examination program according to a second aspect of the present disclosure is an eye examination program for use in an eye examination device that has an eye target presenting means for emitting an eye target light beam toward an eye to be examined and a corrective means for changing the optical characteristics of the eye target light beam, and that subjectively measures the eye refractive power of the eye to be examined. The eye examination program is executed by a processor of the eye examination device to cause the eye examination device to execute the following steps: an objective eye refractive power acquisition step for acquiring an objective eye refractive power in an objective measurement of the eye to be examined; a first distance acquisition step for acquiring a first distance from the corneal vertex of the eye to a lens wearing reference position in the objective measurement of the eye to be examined; a second distance acquisition step for acquiring a second distance from the corneal vertex of the eye to a lens wearing reference position in the subjective measurement of the eye to be examined; a conversion step for converting a first objective eye refractive power based on the first distance into a second objective eye refractive power based on the second distance when the first distance and the second distance are different; and an output step for outputting the second objective eye refractive power.

[0011] (3) An eye examination apparatus according to a third aspect of the present disclosure is an eye examination apparatus for measuring the eye refractive power of a test eye, and is characterized in that it comprises an objective eye refractive power acquisition means for acquiring the objective eye refractive power in the objective measurement of the test eye, a first distance acquisition means for acquiring a first distance from the corneal apex of the test eye to a lens wearing reference position in the objective measurement of the test eye, a second distance acquisition means for acquiring a second distance from the corneal apex of the test eye to a lens wearing reference position in the subjective measurement of the test eye, a conversion means for converting a first objective eye refractive power based on the first distance into a second objective eye refractive power based on the second distance when the first distance and the second distance are different, and an output means for outputting the second objective eye refractive power. [Brief description of the drawings]

[0012] [Figure 1] 1 is an external view of a subjective optometry apparatus according to an embodiment of the present invention. [Diagram 2] 1 is a schematic external view showing the front and rear surfaces of an eye refractive power measuring unit according to the present embodiment. [Diagram 3] FIG. 2 shows a corneal position aiming unit. [Figure 4]FIG. 2 is a diagram showing the configuration of an aiming scale plate and a reticle plate. [Diagram 5] FIG. 2 is a schematic diagram illustrating a control system in the subjective optometry apparatus. [Figure 6] FIG. 11 is a flow chart showing the flow of subjective measurement. [Figure 7] FIG. 1 is a diagram illustrating the configuration of an objective eye refractive power measuring device and a subjective eye examination device. [Figure 8] FIG. 13 shows an alignment scale plate and a reticle plate for confirming the corneal apex position. [Figure 9] 1 is a schematic diagram of a first distance in objective measurement and a second distance in subjective measurement. FIG. [Figure 10] FIG. 13 is a diagram showing an imaging element disposed in a cornea position targeting unit. [Figure 11] FIG. 1 is an external view of a subjective optometry device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] <Summary> An embodiment of the optometry device according to the present embodiment will be described. The items classified in <> below can be used independently or in conjunction with each other.

[0014] The optometry apparatus of the present embodiment may be a subjective optometry apparatus that subjectively measures the ocular refractive power of the subject's eye. For example, at least one of spherical power, cylindrical power, astigmatism axis angle, etc. may be measured as the ocular refractive power of the subject's eye. Of course, the subjective optometry apparatus may measure binocular vision function (for example, at least one of prism amount, stereoscopic vision function, etc.), contrast sensitivity, etc. in addition to the ocular refractive power.

[0015] <Means for presenting visual targets> The eye examination apparatus of this embodiment may include an optotype presenting means (for example, an optotype presenting unit 60). The optotype presenting means emits an optotype light beam toward the eye to be examined.

[0016] For example, the optotype presenting means may be a display (for example, the display 61). Also, for example, the optotype presenting means may be a light source and a DMD (Digital Micromirror Device). Also, for example, the optotype presenting means may be a light source and an optotype plate.

[0017] For example, the target light beam from the target presenting means may be directly guided toward the subject's eye. Also, for example, the target light beam from the target presenting means may be guided toward the subject's eye via a light projecting optical system (for example, the light projecting optical system 230). For example, the light projecting optical system may have at least one optical member through which the target light beam emitted from the target presenting means passes. As an example, it may have at least one of a lens, a mirror, and the like.

[0018] <Correction means> The optometry device of this embodiment may include a correction means. The correction means changes the optical characteristics of the visual target light beam emitted from the visual target presenting means. For example, the correction means may be disposed in the optical path of the light projection optical system and change the optical characteristics of the visual target light beam.

[0019] The correction means may have any configuration as long as it can change the optical characteristics of the target light beam.

[0020] For example, the correction means may have an optical element. For example, the optical element may be at least one of a spherical lens, a cylindrical lens, a variable focus lens, a cross cylinder lens, a rotary prism, a wavefront modulating element, etc. Of course, the optical element may be different from these. In this case, the optical characteristic of the target light beam is changed by controlling the optical element.

[0021] Also, for example, the correction means may have a configuration for optically changing the presenting position (presenting distance) of the optotype relative to the eye to be examined. As an example, the correction means may have a configuration for moving the optotype presenting means in the optical axis direction, or may have a configuration for moving an optical element (e.g., a spherical lens, etc.) in the optical path in the optical axis direction. In this case, the optical characteristics of the optotype light beam are changed by controlling a driving means for controlling at least one of the optotype presenting means and the optical element.

[0022] Also, for example, the correction means may be an eye refraction measuring unit (for example, eye refraction measuring unit 50) that switches and arranges an optical element (for example, optical element 46) in front of the subject's eye through an examination window (for example, examination window 53). For example, the eye refraction measuring unit may have a lens disk (for example, lens disk 45) on which a plurality of optical elements are arranged on the same circumference. In this case, the optical characteristics of the visual target light beam are changed by controlling a driving means (for example, driving unit 56, driving unit 57, etc.) for controlling the lens disk.

[0023] <Method of obtaining objective eye refractive power> The optometry apparatus of the present embodiment may include an objective refractive power acquisition means (e.g., a control unit 70). The objective refractive power acquisition means acquires the objective refractive power in the objective measurement of the subject's eye. For example, the objective refractive power may be at least one of spherical power, cylindrical power, and astigmatism axis angle.

[0024] For example, the objective refraction acquisition means may acquire the objective refraction input by the examiner operating the operation means (for example, the controller 71). Also, for example, the objective refraction acquisition means may read an identifier for each subject and acquire the objective refraction stored in the identifier. As an example, the identifier may be an ID, a character string, a one-dimensional code, a two-dimensional code, a color code, or the like. Also, for example, the objective refraction acquisition means may acquire the objective refraction by receiving data measured using an eye refraction measurement device that objectively measures the objective refraction of the subject's eye by projecting a measurement light beam onto the fundus of the subject's eye and receiving a reflected light beam of the measurement light beam reflected by the fundus.

[0025] In the above eye refractive power measuring device, a first distance (described later) from the corneal apex position to the lens wearing reference position in the objective measurement of the subject's eye may be preset as a predetermined distance. For example, the first distance is stored and set in the device in advance as a standard distance (reference value) of 12 mm, which is generally considered to be the ideal corneal apex distance in Japan. Of course, the first distance may be a value other than 12 mm. The first distance may be set as a fixed reference value, or may be set as a reference value that can be arbitrarily changed by the examiner. In this case, the objective eye refractive power acquiring means may receive at least any data such as spherical power, cylindrical power, and astigmatism axis angle based on the first distance.

[0026] <First distance acquisition means> The optometry apparatus of this embodiment may include a first distance acquisition means (e.g., a control unit 70). The first distance acquisition means acquires a first distance from the corneal apex position of the subject's eye to the lens wearing reference position in an objective measurement of the subject's eye. For example, the lens wearing reference position in the objective measurement may be a position where the spectacle lens is assumed to be placed when the subject's eye wears the spectacle lens. For example, a position that is a standard distance (reference value) away from the corneal apex position of the subject's eye may be set as the lens wearing reference position.

[0027] For example, the first distance acquisition means may acquire the first distance input by the examiner operating the operation means. Also, for example, the first distance acquisition means may read an identifier for each subject and acquire the first distance stored in the identifier. Also, for example, the first distance acquisition means may acquire the first distance by receiving data from the above-mentioned eye refraction measurement device. In this case, the first distance acquisition means and the objective eye refraction acquisition means may be used together, and data on the objective eye refraction may be received together with data on the first distance.

[0028] <Second distance acquisition means> The optometry apparatus of this embodiment may include a second distance acquisition means (e.g., a control unit 70). The second distance acquisition means acquires a second distance from the corneal apex position of the subject's eye to the lens wearing reference position in a subjective measurement of the subject's eye. For example, the lens wearing reference position in a subjective measurement may be a position where a spectacle lens is assumed to be placed when the subject's eye wears the spectacle lens. For example, when the optometry apparatus includes an eye refractive power measurement unit, the position where an optical element of a lens disk closest to the subject's eye is placed may be set as the lens wearing reference position.

[0029] For example, the second distance acquisition means may acquire the second distance input by the examiner operating the operation means. Also, for example, the second distance acquisition means may acquire the second distance based on a detection result detected by a detection means described later. Also, for example, the second distance acquisition means may acquire the second distance that is set as a fixed value in advance in the subjective optometry device.

[0030] <Conversion method> The optometry device of this embodiment may include a conversion means (e.g., a control unit 70). When the first distance of the objective measurement is different from the second distance of the subjective measurement, the conversion means converts the first objective refractive power based on the first distance into the second objective refractive power based on the second distance. For example, the conversion means may convert the first objective refractive power into the second objective refractive power using a conversion table or an arithmetic expression for converting the first objective refractive power into the second objective refractive power. Also, for example, the conversion means may convert the first objective refractive power into the second objective refractive power by adding a conversion amount to the first objective refractive power using a conversion table or an arithmetic expression for acquiring a conversion amount for converting the first objective refractive power into the second objective refractive power.

[0031] For example, the conversion amount and the second objective eye refractive power may be acquired by using such a conversion table or arithmetic formula to correct the shift in the focusing position of the target light beam caused by the difference between the first distance in the objective measurement and the second distance in the subjective measurement. For example, the conversion table or arithmetic formula may be acquired in advance from the results of experiments or simulations, and stored in a storage unit.

[0032] The conversion means may convert the first objective refractive power into the second objective refractive power when the difference between the first distance of the objective measurement and the second distance of the subjective measurement exceeds a predetermined threshold (predetermined distance). For example, the predetermined threshold for the difference between the first distance and the second distance may be set as a fixed value in advance, or may be set to an arbitrary value by the examiner.

[0033] The conversion means may convert the first objective refractive power into the second objective refractive power when the first distance of the objective measurement is different from the second distance of the subjective measurement and the first objective refractive power of the objective measurement exceeds a predetermined threshold (predetermined refractive power). For example, the predetermined threshold value of the first objective refractive power may be set as a fixed value in advance, or may be set to an arbitrary value by the examiner. Also, for example, the predetermined threshold value of the first objective refractive power may be set for the direction in which the first objective refractive power is negative, or may be set for the direction in which the first objective refractive power is positive. Of course, the predetermined threshold value of the first objective refractive power may be set for both the direction in which the first objective refractive power is negative and the direction in which the first objective refractive power is positive.

[0034] In this embodiment, the conversion means may convert the first objective eye refractive power into the second objective eye refractive power according to the values ​​of the first distance of the objective measurement and the second distance of the subjective measurement. In addition, in this embodiment, the conversion means may convert the first objective eye refractive power into the second objective eye refractive power based on a determination result of whether or not the first distance of the objective measurement and the second distance of the subjective measurement are different. In this case, the eye examination device may include a determination means for determining whether or not the first distance of the objective measurement and the second distance of the subjective measurement are different. For example, a tolerance may be set for the difference between the first distance and the second distance, and when the tolerance range is exceeded, it may be determined that the respective distances are different.

[0035] <Detection Method> The optometry device of the present embodiment may include a detection unit that detects a second distance in the subjective measurement of the subject's eye. This makes it easy to know whether the second distance in the subjective measurement coincides with the first distance in the objective measurement.

[0036] The detection means may be configured to measure the distance from the subject's eye to the lens wearing reference position. For example, the detection means may be an imaging element for imaging the subject's eye, and may detect the distance by analyzing and processing the image captured by the imaging element. For example, the detection means may project an index light beam onto the cornea of ​​the subject's eye, and measure the distance by using an alignment index image based on the index light beam reflected by the cornea. That is, the detection means may be an alignment optical system. For example, the detection means may measure the distance by emitting an optical signal toward the subject's eye and detecting a reflected signal of the optical signal reflected by the subject's eye. That is, the detection means may be an optical detector. For example, the detection means may measure the distance by emitting an ultrasonic wave toward the subject's eye and detecting a reflected wave of the ultrasonic wave reflected by the subject's eye. That is, the detection means may be an ultrasonic detector. Of course, the detection means may be an optical system or detector different from these.

[0037] <Output method> The optometry apparatus of this embodiment may include an output means (for example, the control unit 70). The output means outputs the second objective eye refractive power obtained by converting the first objective eye refractive power by the conversion means.

[0038] For example, the output means may output the second objective refractive power in order to set an initial correction value of the correction means. In this case, the optometry apparatus may include a correction control means (e.g., the control unit 70) that sets an initial correction value of the correction means based on the second objective refractive power output from the output means. For example, the initial correction value of the correction means may be a value of the second objective refractive power. That is, it may be a correction value for correcting the subject's eye with the second objective refractive power. Also, for example, the initial correction value of the correction means may be a value different from the second objective refractive power and calculated based on the second objective refractive power. For example, it may be a correction value for correcting the subject's eye with an eye refractive power set as a guideline for the second objective refractive power. As an example, it may be a correction value for correcting with an eye refractive power obtained by adding or subtracting a predetermined step (e.g., 0.25D, etc.) to or from the second objective refractive power.

[0039] The correction control means may change the refractive power of the subject's eye based on the initial correction value. For example, the optotype presenting means may be moved in the optical axis direction based on the initial correction value. Also, for example, an optical element in the optical path of the optotype light beam may be moved relative to the optical axis or inserted or removed based on the initial correction value. If the eye examination device includes an eye refractive power measurement unit, the optical elements of each lens disk may be switched and positioned based on the initial correction value. By controlling at least one of the optotype presenting means and the optical element, the subject's eye is corrected to a predetermined eye refractive power at the start of the subjective measurement of the subject's eye, and the subjective measurement can be performed smoothly.

[0040] For example, the output means may output the second objective refractive power to prompt the examiner to set an initial correction value of the correction means. In this case, the optometry apparatus may include a display control means for causing a display means to display information based on the second objective refractive power based on the second objective refractive power output from the output means. In addition, in this case, the optometry apparatus may include a print control means for causing a print means to print information based on the second objective refractive power based on the second objective refractive power output from the output means.

[0041] The information based on the second objective refractive power may be a value of the second objective refractive power, or an initial correction value of the correction means calculated based on the second objective refractive power. The initial correction value of the correction means may be a value of the second objective refractive power, or a correction value calculated based on the second objective refractive power. For example, the examiner may input information based on the second objective refractive power acquired by at least one of the display control means, the print control means, etc., by operating the operation means. The correction control means may set the initial correction value of the correction means based on an operation signal from the operation means.

[0042] <Response input method> The optometry apparatus of this embodiment may include a response input means. The response input means is a means for the subject to input a response to interpreting the test optotype. For example, the response input means may be an operating means (e.g., the subject controller 220) such as a lever switch or a push button switch. The response input means may be provided integrally with the housing of the optometry apparatus. The response input means may also be provided separately from the housing of the optometry apparatus.

[0043] The response input means may be configured to allow input in a plurality of predetermined directions. As an example, input in four directions, up, down, left and right, may be allowed. In other words, input at angles of 0° (360°), 90°, 180° and 270° may be allowed. Of course, input in more than four directions may be allowed, or input in all directions from 0° to 359° may be allowed.

[0044] <Control Means> The eye examination device of this embodiment may include a control means. After the correction control means sets the initial correction value of the correction means, the control means automatically proceeds with the subjective measurement based on the input signal from the response input means. More specifically, after changing the refractive power for correcting the eye to be examined based on the initial correction value of the correction means, the control means automatically proceeds with the subjective measurement based on the input signal from the response input means. For example, a self-eye examination program for performing a so-called self-eye examination in which the examinee proceeds with the subjective measurement by himself / herself may be proceeded. In the self-eye examination, since the second distance of the subjective measurement cannot be easily matched to the first distance of the objective measurement, there is a high possibility that the eye to be examined is corrected with a different eye refractive power at the start of the subjective measurement. However, as in this embodiment, when the first distance and the second distance are different, the first objective eye refractive power based on the first distance is converted into the second objective eye refractive power based on the second distance and output, so that the eye to be examined can be correctly corrected with a predetermined eye refractive power, and the subjective measurement can be performed smoothly.

[0045] The optometry device of the present embodiment may be an objective optometry device that objectively measures the ocular refractive power of the subject's eye, and in the objective optometry device, the first objective refractive power based on the first distance may be converted into a second objective refractive power based on the second distance and output. In this case, the optometry device may include an objective refractive power acquisition means for acquiring the objective refractive power in the objective measurement of the subject's eye, a first distance acquisition means for acquiring the first distance from the corneal apex of the subject's eye to the lens wearing reference position in the objective measurement of the subject's eye, a second distance acquisition means for acquiring the second distance from the corneal apex of the subject's eye to the lens wearing reference position in the subjective measurement of the subject's eye, a conversion means for converting the first objective refractive power based on the first distance into a second objective refractive power based on the second distance when the first distance and the second distance are different, and an output means for outputting the second objective refractive power.

[0046] The present disclosure is not limited to the device described in the present embodiment. For example, the terminal control software (program) that performs the functions of the above embodiment can be supplied to a system or device via a network or various storage media, and the control device (e.g., CPU, etc.) of the system or device can read and execute the program.

[0047] <Example> An embodiment of the optometry device according to the present disclosure will be described below. The items grouped in <> below may be used independently or in conjunction with each other.

[0048] <Device configuration> 1 is a perspective view showing the entire subjective optometry apparatus 1 from the front side. For example, in this embodiment, the side where the subject's eye E is located is the front side of the entire subjective optometry apparatus, and the side where the examiner's eye OE is located is the back side of the entire subjective optometry apparatus.

[0049] For example, the subjective optometry device 1 includes a support arm 2, an optometry table 3, a controller 71, an eye refraction measuring unit 50, an optotype presenting unit 60, etc. For example, the subject's eye E observes the test optotype from the front of the eye refraction measuring unit 50 through an examination window 53, which will be described later. For example, the examiner's eye OE observes the front of the subject's eye E from the rear of the eye refraction measuring unit 50 through the examination window 53, which will be described later. Also, for example, the examiner's eye OE observes the side of the subject's eye E from the rear of the eye refraction measuring unit 50 through a confirmation window 11, which will be described later.

[0050] <Eye refractive power measurement unit> The eye refraction measuring unit 50 will be described below. Fig. 2(a) is a schematic external view of the eye refraction measuring unit 50 according to this embodiment, shown from the front (the side of the examinee's eye E). Fig. 2(b) is a schematic external view of the eye refraction measuring unit 50 according to this embodiment, shown from the rear (the side of the examiner's eye OE). For example, the eye refraction measuring unit 50 includes a forehead rest 51, a connecting portion 52, a forehead rest adjustment knob 5, an examination window 53, a moving unit 54, a pair of left and right lens chamber units 55, and the like.

[0051] For example, the forehead rest 51 fixes the position of the subject's face by contacting the forehead of the subject. Therefore, the subject's eye E is kept at a constant distance from the examination window 53. For example, the connecting part 52 has one end connected to the forehead rest 51 and the other end connected to the moving unit 54. For example, the forehead rest adjustment knob 5 is used to adjust the position of the forehead rest 51.

[0052] For example, the moving unit 54 includes a driving section 58, a driving section 59, etc. For example, the driving section 58 has a slide mechanism and adjusts the spacing of the lens chamber units 55. This allows the examiner to change the spacing of the examination windows 53 in accordance with the interpupillary distance of the subject's eye E. In addition, for example, the driving section 59 has a convergence mechanism and adjusts the convergence angle (convergence angle) of the lens chamber units 55. Please refer to JP-A-2004-329345 for detailed configuration of the moving unit.

[0053] For example, the lens chamber unit 55 includes a light source 40, a lens disk 45, a driving unit 56, a driving unit 57, a corneal position aiming unit 10, a suppression unit 30, and the like. For example, an LED (Light Emitting Diode) or the like is used for the light source 40. For example, the light source 40 includes a first light source 40a for illuminating one of the left and right test eyes, and a second light source 40b for illuminating the other of the left and right test eyes (see Figs. 2(a) and 3). For example, in this embodiment, a configuration in which the first light source 40a is disposed in the left-eye lens chamber unit 55L to illuminate the left eye EL, and the second light source 40b is disposed in the right-eye lens chamber unit 55R to illuminate the right eye ER is taken as an example.

[0054] For example, the lens disk 45 has many optical elements 46 (spherical lenses, cylindrical lenses, dispersion prisms, etc.) arranged on the same circumference. For example, a drive unit 56 (actuator, stepping motor, etc.) controls the rotation of the lens disk 45. This allows the optical element 46 desired by the examiner to be switched and arranged in the inspection window 53. For example, a drive unit 57 (motor, solenoid, stepping motor, etc.) controls the rotation of the optical element 46 arranged in the inspection window 53. This allows the optical elements 46 to be arranged in the left and right inspection windows 53 at the rotation angle desired by the examiner.

[0055] For example, the lens disk 45 is composed of one lens disk or multiple lens disks. For example, when multiple lens disks (lens disk group) are provided, a driving unit corresponding to each lens disk is provided. For example, each lens disk of the lens disk group has an aperture (or a 0D lens) and multiple optical elements. Representative types of each lens disk include a spherical lens disk having multiple spherical lenses with different degrees, a cylindrical lens disk having multiple cylindrical lenses with different degrees, and an auxiliary lens disk. For example, at least one of a red filter / green filter, a prism, a cross cylinder lens, a polarizing plate, a Maddox lens, and an autocross cylinder lens is arranged on the auxiliary lens disk. For detailed configurations of the lens disk, please refer to JP2007-68574A and JP2011-72431A.

[0056] <Corneal position targeting unit> The corneal position aiming unit 10 will be described below. Fig. 3 is a diagram showing the corneal position aiming unit 10. For example, the corneal position aiming unit 10 includes a first corneal position aiming unit 10a and a second corneal position aiming unit 10b. For example, in this embodiment, a configuration in which the left-eye lens chamber unit 55L has the first corneal position aiming unit 10a and the right-eye lens chamber unit 55R has the second corneal position aiming unit 10b will be taken as an example.

[0057] For example, the first corneal position aiming unit 10a is used to confirm the distance between the corneal apex of one of the examinee's eyes (for example, the left eye EL in this embodiment) illuminated by the first light source 40a and the lens wearing reference position (described later). For example, the first corneal position aiming unit 10a includes a first confirmation window 11a, a first observation window 12a, and a first corneal position aiming optical system 20a. For example, the first confirmation window 11a is used to confirm the first corneal position aiming optical system 20a arranged inside the eye refraction measurement unit 50 from the outside of the eye refraction measurement unit 50. For example, the first observation window 12a is used to guide the reflected light irradiated from the first light source 40a and reflected by one of the examinee's eyes (for example, the left eye EL) to the first corneal position aiming optical system 20a arranged inside the eye refraction measurement unit 50.

[0058] For example, the first corneal position aiming optical system 20a guides light that is irradiated from the first light source 40a and reflected by one of the examinee's eyes (for example, the left eye EL) to the first confirmation window 11a. For example, the first corneal position aiming optical system 20a includes a reflecting mirror 22, an aiming scale plate 23, a reticle plate 24, and the like. For example, the reflecting mirror 22 is disposed in the lateral direction (X direction) of the left eye EL. For example, the aiming scale plate 23 is provided between the reflecting mirror 22 and the first confirmation window 11a. The aiming scale plate 23 may be provided between the left eye EL and the reflecting mirror 22. For example, the reticle plate 24 is disposed on the back side of the first confirmation window 11a (inside the left eye lens chamber unit 55L).

[0059] For example, FIG. 4 is a configuration diagram of the sighting scale plate 23 and the reticle plate 24. FIG. 4(a) shows the sighting scale plate 23, and FIG. 4(b) shows the reticle plate 24. For example, the sighting scale plate 23 is provided with several scale lines N1 to N5, a center line N6, and a first index 27. For example, the scale lines N1 to N5 correspond to the corneal vertex distances (see FIG. 3) of 12 mm, 13.75 mm, 16 mm, 18 mm, and 20 mm, respectively. For example, the scale line N2 (13.75 mm) is a reference position when wearing the lens, and is drawn so as to be distinguishable from other scale lines. For example, the center line N6 is used as a reference for aligning the reticle 28 on the reticle plate 24. Also, for example, the center line N6 is located at the center of the sighting scale plate 23 from left to right. For example, the reticle plate 24 is provided with the reticle 28 and the second index 29. For example, the reticle 28 is formed in a triangular shape. Moreover, the reticle 28 is located in the left-right center of the reticle plate 24. For example, on the outer periphery of the reticle plate 24, a numerical value 25 indicating the corneal vertex distance is displayed.

[0060] For example, the first index 27 on the sighting scale plate 23 and the second index 29 on the reticle plate 24 are indexes for guiding the examiner's eye OE to a predetermined distance from the reticle plate 24. For example, in this embodiment, when the examiner's eye OE is located 250 mm away from the reticle plate 24, the first index 27 and the second index 29 are seen to overlap one another. For example, when the first index 27 is located inside with respect to the second index 29, the examiner's eye OE is located closer to the reticle plate 24 than 250 mm. Conversely, when the first index 27 is located outside with respect to the second index 29, the examiner's eye OE is located farther from the reticle plate 24 than 250 mm. For detailed configurations of the sighting scale plate and the reticle plate and their respective positional relationships, please refer to JP-A-2004-229769.

[0061] For example, the second corneal position aiming unit 10b is used to confirm the vertex distance between the corneal apex of the other subject eye (for example, the right eye ER in this embodiment) illuminated by the second light source 40b and the lens wearing reference position. For example, the second corneal position aiming unit 10b is composed of a second confirmation window 11b, a second observation window 12b, and a second corneal position aiming optical system 20b. For example, the second confirmation window 11b is used to confirm the second corneal position aiming optical system 20b arranged inside the eye refraction measurement unit from the outside of the eye refraction measurement unit 50. Also, for example, the second observation window 12b is used to guide the reflected light irradiated from the second light source 40b and reflected by one of the subjects eyes (for example, the left eye EL) to the second corneal position aiming optical system 20b arranged inside the eye refraction measurement unit 50.

[0062] For example, the second corneal position aiming optical system 20b guides light that is irradiated from the second light source 40b and reflected by the other eye to be examined (for example, the right eye ER) to the second confirmation window 11b. Note that the configuration of the second corneal position aiming optical system 20b is similar to the configuration of the first corneal position aiming optical system 20a, and therefore a description thereof will be omitted in this embodiment. Of course, the configurations of these corneal position aiming optical systems may be partially different.

[0063] <Optotype presentation part> The optotype presenting unit 60 presents a test optotype to the subject's eye E. For example, the optotype presenting unit 60 may be a display, a light source and a DMD, a light source and an optotype plate, etc. In this embodiment, a display 61 is used as the optotype presenting unit 60. For example, the display 61 may be an LCD (Liquid Crystal Display), an organic EL (Electro Luminescence), a plasma display, etc.

[0064] The display 61 is disposed at a position a predetermined test distance away from the eye refraction measuring unit 50. For example, it is disposed at a distance (e.g., 5 m) for performing a distance test on the subject's eye E. The display 61 is connected to the controller 71 wirelessly or by wire, and displays a test optotype in response to an operation signal input from the controller 71.

[0065] <Controller> For example, the controller 71 is used to input the objective values ​​(e.g., spherical refractive power, cylindrical refractive power, astigmatism axis angle, etc.) of the subject and the interpupillary distance, and to switch the arrangement of the optical element 46 and the test window 53 in the eye refraction measuring unit 50. Also, for example, the controller 71 is used to switch the test target presented to the subject's eye E. For example, the controller 71 is not fixed to the eye examination table 3, but can be carried around by the examiner at will.

[0066] For example, the controller 71 includes a display unit 72. For example, the display unit 72 displays information on the optical elements arranged in the eye refractive power measuring unit 50, refractive power information of the subject acquired from another device, etc. For example, an operation signal input from the controller 71 is input to the control unit 70 via a cable. Note that the operation signal from the controller 71 may be configured to be input to the control unit 70 via wireless communication such as infrared.

[0067] <Control Unit> 5 is a schematic diagram of a control system in the subjective optometry device 1. For example, the control unit 70 is electrically connected to a controller 71, a non-volatile memory 73, the first light source 40a, the second light source 40b, drive units (drive units 56, 57, 58, 59) included in each member of the eye refractive power measuring unit 50, an optotype presenting unit 60 (display 61), and the like.

[0068] For example, the control unit 70 includes a CPU (processor), a RAM, a ROM, etc. For example, the CPU controls each component in the subjective optometry device 1. For example, the RAM temporarily stores various information. For example, the ROM stores various programs for controlling the operation of the subjective optometry device 1. The control unit 70 may be configured with multiple control units (i.e., multiple processors).

[0069] For example, the non-volatile memory 73 is a non-transient storage medium that can retain stored contents even if the power supply is cut off. For example, the non-volatile memory 73 may be a hard disk drive, a flash ROM, a USB memory, or the like.

[0070] <Control action> The operation of the subjective optometry apparatus having the above-mentioned configuration will be described below.

[0071] The flow of subjective measurement using the subjective optometry device of this embodiment will be described with reference to the flow chart of Fig. 6. For example, first, the left eye is corrected with a predetermined correction power (initial correction value) based on the objective refractive power (objective value), and then subjective measurement of the left eye is performed to obtain the subjective refractive power (subjective value) of the left eye. After the measurement of the left eye is completed, the right eye is similarly measured to obtain the subjective value of the right eye.

[0072] <Acquisition of objective values ​​using a subjective optometry device (S1)> In step S1, a first objective value used to start a subjective measurement of the subject's eye is acquired. The examiner calls up the first objective value of the subject's eye previously measured using an objective refraction measurement device 100 (see FIG. 7) and causes the subjective optometry device to receive it. For example, the first objective value is stored in a memory (not shown) of the objective refraction measurement device 100 in association with the ID of the subject. For details of the objective measurement using the objective refraction measurement device, please refer to, for example, Japanese Patent Application Laid-Open No. 2005-185523.

[0073] 7 is a configuration diagram of an objective eye refraction measurement device and a subjective eye examination device. For example, in this embodiment, the objective eye refraction measurement device 100 and the subjective eye examination device 1 are wirelessly connected. This allows data to be transmitted and received between the objective eye refraction measurement device 100 and the subjective eye examination device 1. Of course, these devices may be connected by wire instead of wirelessly.

[0074] For example, the examiner operates the controller 71 of the subjective optometry apparatus 1 to input the ID of the subject. The control unit 70 of the subjective optometry apparatus 1 outputs an operation signal to the objective optometry apparatus 100 to transmit a first objective value associated with the ID of the subject. When the control unit (not shown) of the objective optometry apparatus 100 receives the ID of the subject from the subjective optometry apparatus 1, it calls up the first objective value corresponding to the ID of the subject from the memory and transmits it to the subjective optometry apparatus 1. The control unit 70 of the subjective optometry apparatus 1 receives the first objective value transmitted from the objective optometry apparatus 100. This allows the control unit 70 to obtain the first objective value of the subject's eye.

[0075] <Obtaining the first distance in a subjective optometry device (S2)> In step S2, the corneal vertex distance V1 (hereinafter, the first distance V1) in the objective measurement of the subject's eye E is acquired. For example, the first distance V1 in the objective measurement is the distance from the position of the corneal vertex of the subject's eye E to a position (lens wearing reference position) where the spectacle lens is assumed to be placed when the subject's eye wears the spectacle lens. The details of the first distance V1 will be described later. In the objective measurement, the first distance V1 is set as a predetermined distance in advance, and a first objective value based on the first distance V1 is acquired. For example, in this embodiment, the first distance V1 is set to 12 mm, and the spectacle lens is assumed to be placed 12 mm ahead of the subject's eye E, and the ocular refractive power (for example, at least one of spherical power, cylindrical power, and astigmatism axis angle) that corrects the subject's eye E to 0D is acquired as the first objective value based on the first distance V1.

[0076] The first distance V1 in such an objective measurement of the subject's eye E is acquired based on transmission and reception of data between the objective refraction measurement device 100 and the subjective optometry device 1. For example, the first distance V1 is transmitted from the control unit of the objective refraction measurement device 100 to the control unit 70 of the subjective optometry device 1 together with the first objective value in step S1. This allows the control unit 70 to acquire the first distance V1.

[0077] <Obtaining the second distance in the subjective optometry device (S3)> In step S3, the corneal vertex distance V2 (hereinafter, the second distance V2) in the subjective measurement is acquired. For example, the second distance V2 in the subjective measurement is the distance from the position of the corneal vertex of the test eye E to the position (lens wearing reference position) where the spectacle lens is placed when the test eye wears the spectacle lens. The second distance V2 will be described in detail later. In the subjective measurement, the second distance V2 is acquired by measuring the second distance V2 using the corneal position aiming unit 10.

[0078] First, the examiner instructs the subject to look into the test window 53. In response to the examiner's instruction, the subject places his / her face against the forehead rest 51 provided in the eye refraction measuring unit 50 and looks into the test window 53. Here, the examiner operates the controller 71 to set a mode for observing the position of the subject's corneal apex, and the control unit 70 turns on the first light source 40a and the second light source 40b, respectively. As a result, the left eye EL and the right eye ER are illuminated with a sufficient amount of light.

[0079] Next, the examiner looks into the first confirmation window 11a of the left-eye lens chamber unit 55L to confirm the position of the corneal apex of the left eye EL. Fig. 8 is a diagram showing the aiming scale plate 23 and the reticle plate 24 when confirming the position of the corneal apex. The examiner searches for a position where the first index 27 on the aiming scale plate 23 and the second index 29 on the reticle plate 24 match up, down, left and right, and the first index and the second index overlap and appear as one. Furthermore, the examiner searches for a position where the tip of the reticle 28 and the center line N6 appear to match up.

[0080] For example, as described above, the examiner adjusts the position of the forehead support 51 in the eye refractive power measuring unit 50 by operating the forehead support adjustment knob 5 (see FIG. 2(b)) while checking the side of the left eye EL using the first confirmation window 11a. This allows the position of the corneal apex of the left eye EL to be moved. For example, if the corneal apex of the left eye was located near the scale line N2 but is slightly deviated from the scale line N2, the position of the corneal apex can be made to coincide with the scale line N2 by operating the forehead support adjustment knob 5. After this, the examiner similarly adjusts the position of the corneal apex of the right eye ER to coincide with the scale line N2 using the second confirmation window 11b. Note that the positions of the corneal apex of the left eye EL and the right eye ER may be adjusted from either one.

[0081] In this embodiment, since the position of the corneal apex of the subject's eye E coincides with the scale line N2, the second distance V2 of the subject's eye E is 13.75 mm. For example, the examiner reads the numerical value 25 indicating the corneal apex distance based on the scale line N2, and inputs the second distance V2 using the controller 71. This allows the control unit 70 to obtain the second distance V2.

[0082] <Conversion of initial values ​​in subjective measurement (S4)> In order to start subjective measurement of the subject's eye E, the control unit 70 adds a predetermined correction power (i.e., an initial value) to the subject's eye E so that the subject's eye E is corrected to a predetermined ocular refractive power based on the first objective value. For example, a predetermined initial value is added to the subject's eye E so that the visual target light beam from the display 61 is focused on the retina via the optical element 46 (in other words, so that the ocular refractive power of the subject's eye E becomes 0D). As an example, if the objective values ​​of the subject's eye E are spherical power -2.0D, cylindrical power -1.0D, and astigmatism axis angle 45 degrees, adding these powers and angles as initial values ​​makes the ocular refractive power 0D.

[0083] In step S4, the initial value when starting such subjective measurement is converted as necessary. In this embodiment, the control unit 70 sets the initial value of the subjective measurement based on the first objective value and the first distance V1 in the objective measurement of the subject's eye E and the second distance V2 in the subjective measurement. This will be described in detail below.

[0084] FIG. 9 is a schematic diagram of the first distance in the objective measurement and the second distance in the subjective measurement. FIG. 9(a) shows the first distance. FIG. 9(b) shows the second distance. For example, the first distance V1 in the objective eye refraction measurement device 100 is the distance from the position of the corneal vertex 82 of the test eye E to the lens wearing reference position where the spectacle lens 80 is placed when the test eye wears the spectacle lens, as described above. More specifically, it is the distance from the position of the corneal vertex 82 of the test eye to the position 81 of the rear surface of the spectacle lens 80. For example, the second distance V2 in the subjective eye examination device 1 is the distance from the position of the corneal vertex 82 of the test eye E to the lens wearing reference position, as described above. In this embodiment, the eye refraction measurement unit 50 is present in front of the test eye E, and the test window 53 and the multiple lens disks 45 are arranged in this order in the direction away from the test eye E. For example, among the multiple lens disks 45, the optical element 46a of the lens disk 45 closest to the subject's eye E is disposed next to the examination window 53. In the subjective optometry device 1, the second distance V2 can be considered as the distance from the position of the corneal apex 82 of the subject's eye to the position of the rear surface of the optical element 46a.

[0085] Here, if the first distance V1 in the objective measurement and the second distance V2 in the subjective measurement are different, the ocular refractive power of the test eye may not be corrected to 0 D even if an initial value based on the first objective value of the test eye is added.

[0086] For example, in FIG. 9(a), the corneal vertex distance of the test eye E is a first distance V1, and the visual target light beam toward the test eye E is refracted by the spectacle lens 80, the cornea, and the crystalline lens to be focused at a focusing position f1 on the retina. In other words, the eye refractive power of the test eye E is corrected to 0D. On the other hand, for example, as shown in FIG. 9(b), when the corneal vertex distance of the test eye E is a second distance V2 longer than the first distance V1, the visual target light beam toward the test eye E is refracted by the optical element 46a located in front of the spectacle lens 80, the cornea, and the crystalline lens to be focused at a focusing position f2 behind the retina. Note that, when the spectacle lens 80 and the optical element 46a are minus lenses, the longer the second distance V2 is with respect to the first distance V1, the deeper the visual target light beam is located behind the retina. Although not shown in the figure, the shorter the second distance V2 is relative to the first distance V1, the closer the visual target light flux is to the retina.

[0087] For this reason, when the first objective value of the test eye is set as the initial value of the subjective measurement, if there is a deviation V3 between the first distance V1 and the second distance V2, a deviation 84 will occur between the focusing position f1 and the focusing position f2, and therefore the actual eye refractive power when the test eye looks at the display 61 through the eye refractive power measuring unit 50 will be corrected to a value different from 0D. For example, even if the first objective value of the test eye is -2.0 in spherical power and a spherical lens of -2.0D is arranged as the optical element 46, the test eye will be in the same state as looking at the test target through a spherical lens weaker than -2.0D (for example, -1.75D, etc.).

[0088] Therefore, in this embodiment, when the first distance V1 of the objective measurement and the second distance V2 of the subjective measurement are the same distance, the first objective value of the objective measurement is set as the initial value of the subjective measurement. Also, when the first distance V1 of the objective measurement and the second distance V2 of the subjective measurement are different distances, the first objective value of the objective measurement is converted (corrected) based on the first distance V1 and the second distance V2 to obtain a second objective value, and this second objective value is set as the initial value of the subjective measurement.

[0089] In this embodiment, the first objective value of the subject's eye is converted based on the deviation between the first distance V1 and the second distance V2. For example, a correction amount for converting the first objective value based on the first distance V1 to the second objective value based on the second distance V2 is obtained using a lookup table in which the first objective value of the subject's eye and the deviation between the first distance V1 and the second distance V2 are associated with each other. As an example, the lookup table is configured to obtain the correction amount to be added to the first objective value by referring to the first objective value of the subject's eye and the deviation between the first distance V1 and the second distance V2.

[0090] For example, the lookup table may be set in advance based on the results of experiments or simulations. As an example, the refractive power corresponding to the shift 84 of the focusing position of the visual target light beam, which changes due to the difference between the first distance V1 and the second distance V2, may be obtained by experiments or simulations, and the refractive power may be set in advance so that it can be acquired as a correction amount. The lookup table may be provided for each of the spherical power, the cylindrical power, and the cylindrical axis angle, and is stored in the non-volatile memory 73.

[0091] For example, the control unit 70 calls up a lookup table from the non-volatile memory 73 and refers to the first objective value of the subject's eye and the deviation between the first distance V1 and the second distance V2. In this embodiment, the first distance V1 is 12 mm and the second distance V2 is 13.75 mm, so the deviation is 1.75 mm. This allows the control unit 70 to obtain a correction amount corresponding to the deviation amount of 1.75 mm for converting the first objective value into the second objective value, and to obtain the second objective value by adding the correction amount to the first objective value.

[0092] <Measurement of subjective values ​​(S5)> In step S5, the second objective value acquired in step S4 is set as an initial value, and subjective measurement of the test eye is started. For example, the control unit 70 controls the rotation angle of the lens disk 45 and the rotation angle of the optical element 46 to correct the test eye E with the second objective value. For example, the control unit 70 changes the rotation angle of the lens disk 45 to place the optical element 46 having the spherical power and cylindrical power of the second objective value in the test window 53. In addition, the control unit 70 changes the rotation angle of the optical element 46 having the cylindrical power of the second objective value to place it in the test window 132 with the astigmatism axis angle of the second objective value. This allows the second objective value to be added to the test eye E. As a result, even if the first distance V1 in the objective measurement and the second distance V2 in the subjective measurement are different, the shift 84 (see Figure 9(b)) in the focal positions (f1 and f2) is corrected, and the visual target light beam entering the test eye is focused on the retina via the optical element 46 (the ocular refractive power of the test eye is corrected to 0D).

[0093] The examiner performs subjective measurement of the subject's eye E at a distance while changing the test optotype presented to the subject's eye E and the correction power for correcting the subject's eye. For example, the examiner operates the controller 71 to select a desired test optotype. The control unit 70 calls up the corresponding test optotype data from the non-volatile memory 73 in response to an input signal from the controller 71 and displays it on the display 61. The test optotype displayed on the display 61 is presented to the subject's eye E through the test window 53 and the optical element 46 in the ocular refractive power measuring unit 50. For example, the examiner switches the test optotypes and asks the subject how well the test optotypes look. As an example, if the subject's answer is correct, the test optotype is switched to one with a visual acuity value one level higher. As another example, if the subject's answer is incorrect, the test optotype is switched to one with a visual acuity value one level lower. Furthermore, for example, the examiner performs the examination while changing the correction power of the eye E to be examined as well as switching the test optotype.

[0094] <Acquisition of self-awareness value (S6)> In step S6, subjective values ​​of the subject's eye E are acquired. For example, the control unit 70 stores measurement results such as spherical power, cylindrical power, and astigmatism axis angle as subjective values ​​of the subject's eye E in the non-volatile memory 73. In addition, the control unit 70 causes the display unit 72 of the controller 71 to display the subjective values ​​of the subject's eye E.

[0095] As described above, for example, the optometry apparatus of this embodiment includes an objective refractive power acquisition means for acquiring the objective refractive power in the objective measurement of the subject's eye, a first distance acquisition means for acquiring the first distance from the corneal apex of the subject's eye to the lens wearing reference position in the objective measurement of the subject's eye, a second distance acquisition means for acquiring the second distance from the corneal apex of the subject's eye to the lens wearing reference position in the subjective measurement of the subject's eye, a conversion means for converting the first objective refractive power based on the first distance into a second objective refractive power based on the second distance when the first distance and the second distance are different, and an output means for outputting the second objective refractive power. For example, when the first distance and the second distance are different, the focusing position of the target light beam entering the subject's eye is shifted, and the subject's eye may actually be corrected with a different refractive power at the start of the subjective measurement of the subject's eye. However, by outputting the second objective eye refractive power taking into account such a shift in the focusing position, the test eye can be correctly corrected to a predetermined eye refractive power (for example, 0D), and subjective measurement can be performed smoothly.

[0096] In addition, for example, the optometry apparatus of the present embodiment sets an initial correction value of the correction means based on the second objective refractive power obtained by converting the first objective refractive power. This allows the subject's eye to be easily corrected to a predetermined refractive power so that the shift of the focusing position of the target light beam entering the subject's eye is suppressed at the start of subjective measurement of the subject's eye, and allows the subjective measurement to be performed smoothly.

[0097] <Example of transformation> In this embodiment, when obtaining the second distance V2 in the subjective measurement of the subject's eye E, the position of the corneal vertex 82 is finely adjusted to match the scale line N2 closest to the corneal vertex 82 of the subject's eye E, and the numerical value 25 is read and input, but the present invention is not limited to this. For example, a scale line on which the corneal vertex 82 of the subject's eye E is to be positioned may be determined, and the numerical value 25 corresponding to this scale line may be preset as the second distance V2. In other words, the second distance V2 may be preset as a fixed distance. This eliminates the need for the examiner to input the second distance V2 into the device. In this case, the examiner can adjust the second distance V2 by operating the forehead support adjustment knob 5 (see FIG. 2(b)) so that the position of the corneal vertex 82 of the subject's eye E matches the predetermined scale line.

[0098] In the present embodiment, a correction amount for converting a first objective value based on the first distance V1 into a second objective value based on the second distance V2 is calculated using a lookup table in which the first objective value of the subject's eye and the deviation amount between the first distance V1 and the second distance V2 are associated with each other, but the present invention is not limited to this. For example, a predetermined calculation formula capable of calculating a correction amount based on the first objective value of the subject's eye and the deviation amount between the first distance V1 and the second distance V2 may be used.

[0099] In the present embodiment, the second objective value obtained by adding a correction amount to the first objective value of the subject's eye E is set as the initial value of the subjective measurement, but the present invention is not limited thereto. For example, it may be possible to select which of the first objective value and the second objective value of the subject's eye E is set as the initial value of the subjective measurement. In this case, the control unit 70 may display the first objective value acquired by the objective measurement and the second objective value obtained by adding a correction amount to the first objective value on the display unit 72 of the controller 71. The control unit 70 may set a value according to an operation signal based on the examiner's selection as the initial value and switch and arrange the optical elements.

[0100] In this embodiment, when the first distance V1 of the objective measurement and the second distance V2 of the subjective measurement are different, the initial value when starting the subjective measurement is set based on the second objective value converted from the first objective value of the objective measurement, but this is not limited to this. For example, when the first distance V1 and the second distance V2 of the subjective measurement are different and the first objective value exceeds a predetermined threshold, the control unit 70 may convert the first objective value to a second objective value and set the initial value based on the second objective value. For example, when the spherical power S in the first objective value exceeds a predetermined threshold, the first objective value may be converted to a second objective value. Also, for example, when the cylindrical power C in the first objective value exceeds a predetermined threshold, the first objective value may be converted to a second objective value. Also, for example, when the astigmatism axis angle A in the first objective value exceeds a predetermined threshold, the first objective value may be converted to a second objective value. In this embodiment, the first objective value may be converted to a second objective value at least when the spherical power S exceeds a predetermined threshold value.

[0101] For example, in this way, when the first distance in the objective measurement is different from the second distance in the subjective measurement, and the first objective refractive power exceeds a predetermined threshold, the optometric device converts the first objective refractive power based on the first distance into a second objective refractive power based on the second distance. For example, the larger the absolute value of the first objective refractive power (i.e., the higher the first objective refractive power is), the larger the change in actual refractive power caused by the difference between the first distance in the objective measurement and the second distance in the subjective measurement. Therefore, in a situation where the difference between the first distance and the second distance has a larger effect, the first objective refractive power is converted into the second objective refractive power and output, so that the test eye can be correctly corrected with a predetermined refractive power.

[0102] In this embodiment, the case where the examiner reads the second distance V2 using the sighting scale plate 23 and the reticle plate 24 has been described as an example, but the present invention is not limited to this. For example, the eye refractive power measuring unit 50 may be provided with a detection unit for detecting the second distance V2, so that the second distance V2 can be automatically obtained. In this embodiment, an image sensor is used as such a detection unit.

[0103] 10 is a diagram showing the arrangement of the imaging element in the corneal position aiming unit. For example, the imaging element 13 for detecting the second distance V2 is arranged behind the first confirmation window 11a and the second confirmation window 11b. As a result, the light irradiated from the first light source 40a and reflected by the subject's eye E is imaged by the imaging element 13 via the first observation windows 12a, 20a, 23, 24, and 11a. Similarly, the light irradiated from the second light source 40b and reflected by the subject's eye E is imaged by the imaging element 13 via the second observation windows 12b, 20, 23, 24, and 11b. As a result, a photographed image including the corneal apex 82, the aiming scale plate 23, and the reticle plate 24 of the subject's eye E is acquired.

[0104] The control unit 70 detects the corneal vertex 82 of the subject's eye E and the scale lines (N1 to N5) of the sighting scale plate 23 by analyzing the captured image. For example, edge detection using luminance values ​​may be used as a method for detecting the corneal vertex 82 and the scale lines of the left eye EL. The control unit 70 also detects the scale lines to which the corneal vertex 82 of the subject's eye E comes into contact. For example, a corneal vertex distance is associated with each scale line, and the second distance V2 can be obtained based on the scale lines. For example, the captured image of the right eye ER is also analyzed in the same manner, and the second distance V2 can be obtained. In the above, the image sensor 13 may be configured to be disposed at a position where the second distance V2 can be detected, and is not limited to this embodiment.

[0105] For example, the optometry apparatus of this embodiment detects the second distance in the subjective measurement of the subject's eye and obtains the second distance based on the detection result. This makes it easy to know whether the second distance in the subjective measurement matches the first distance in the objective measurement. As a result, the subject's eye can be corrected with an appropriate eye refractive power based on the first objective refractive power or the second objective refractive power.

[0106] In this embodiment, the configuration for acquiring the position of the corneal apex 82 of the subject's eye E at the start of the subjective measurement of the subject's eye E has been described as an example, but the present invention is not limited thereto. For example, the configuration may be such that the position of the corneal apex 82 is acquired during the subjective measurement of the subject's eye E as well. For example, the control unit 70 may acquire an image captured by the imaging element 13 in real time, and when the position of the corneal apex 82 changes (in other words, when the second distance V2 changes), the control unit 70 may notify the change by a notifying unit (not shown). For example, a tolerance may be set for detecting whether the position of the corneal apex 82 has changed. For example, the notifying unit may be at least one of a speaker, a buzzer, a display, and the like. This allows the subjective measurement of the subject's eye E to proceed with high accuracy.

[0107] In addition, the conversion of the initial value at the start of the subjective measurement in this embodiment can also be applied to a space-saving subjective eye examination device (for example, see Patent Publication No. 2019-000346) that has a target presentation unit within the housing for presenting a test target to the test eye E, and the target light beam from the target presentation unit is folded back by an optical member and guided outside the housing, and this target light beam reaches the test eye via an eye refractive power measurement unit 50.

[0108] In addition, the conversion of the initial value at the start of the subjective measurement in this embodiment can be applied to so-called self-eye examination, in which the examiner does not attend the subject and the subject proceeds with the subjective measurement by himself / herself. For example, in this case, a subject controller for the subject to input the answer may be provided in the subjective eye examination device 1 as shown in Fig. 1, or a subject controller may be provided in a space-saving subjective eye examination device. Hereinafter, such a self-eye examination will be described by taking a space-saving subjective eye examination device as an example.

[0109] Fig. 11 is an external view of a space-saving subjective optometry device 200. Fig. 11(a) is a perspective view of the external appearance of the subjective optometry device 200. Fig. 11(b) is a side view of the inside of the subjective optometry device 200. For example, the subjective optometry device 200 includes a housing 201, a presentation window 202, a speaker 203, a holding unit 204, an examiner controller 210, a subject controller 220, an eye refractive power measuring unit 240, and the like. The eye refractive power measuring unit 240 has the same configuration as the above-mentioned eye refractive power measuring unit 50, and therefore a description thereof will be omitted here.

[0110] The housing 201 has a light projecting optical system 230 therein. The presentation window 202 transmits a visual target light beam from the light projecting optical system 230. The speaker 203 outputs audio guidance and the like. The holding unit 204 holds the eye refractive power measuring unit 240.

[0111] The examiner's controller 210 is used by the examiner to operate the subjective optometry device 200. The examiner's controller 210 includes a switch unit 211, a monitor 212, and the like. The switch unit 211 inputs signals for performing various settings (e.g., movement of the eye refractive power measuring unit 240, etc.). The monitor 212 displays various information (e.g., measurement results of the examinee's eye E, etc.). The monitor 212 may function as a touch panel that also serves as the switch unit 211. A signal from the examiner's controller 210 is output to a control unit (not shown) by wired or wireless communication.

[0112] The subject controller 220 is used to input the subject's answer. The subject controller 220 includes an answer lever 221, an answer button 222, and the like. The answer lever 220 is used when the subject inputs a direction relative to the test target. For example, signals in four directions, up, down, left, and right, can be input by tilting. The answer button 222 is used when the subject does not select a direction relative to the test target. The signal from the subject controller 220 is output to a control unit (not shown) by wired or wireless communication.

[0113] The light projection optical system 230 (see FIG. 11(b)) projects a visual target light beam toward the subject's eye E. For example, the light projection optical system 230 includes a display 231, a plane mirror 232, a concave mirror 233, and the like. The visual target light beam emitted from the display 231 is guided to the outside of the housing 201 via the plane mirror 232, the concave mirror 233, and the plane mirror 232, in that order, and is further projected onto the subject's eye E via the presentation window 202 and the test window and optical elements of the eye refractive power measuring unit 240.

[0114] In such a subjective eye examination device 200, an initial value is set based on the first objective value of the subject's eye E so that the subject's eye E has a predetermined ocular refractive power (such as 0D), and a self-eye examination application is executed, so that the subjective measurement automatically proceeds. Here, for example, in the self-eye examination, the subject can start the subjective measurement by operating the subject's controller 220 after placing his / her face against the forehead rest. At this time, the examiner is not necessarily present, and the second distance V2 of the subjective measurement is likely to be different from the first distance V1 of the objective measurement. For this reason, in particular in the self-eye examination, the first distance V1 and the second distance V2 do not match, which tends to cause a deviation in the actual ocular refractive power.

[0115] In this embodiment, even in the subjective optometry device 200, an initial value of the subjective measurement may be set based on the first objective value and the first distance V1 of the objective measurement of the subject's eye E, and the second distance V2 of the subjective measurement of the subject's eye E. As an example, the control unit may obtain the second distance V2 by analyzing the captured image using a detection unit (image pickup device) provided in the eye refractive power measurement unit 240. In addition, when the first distance V1 and the second distance V2 are different, the first objective value based on the first distance V1 may be converted into a second objective value based on the second distance V2, and this may be set as the initial value of the subjective measurement.

[0116] In this way, the optometry device of this embodiment presents the test optotype to the eye to be examined, and after the initial correction value of the correction means is set, the subjective measurement is automatically performed based on an input signal from the response input means by which the subject inputs the answer of interpreting the test optotype. For example, in a so-called self-eye examination in which the subject performs the subjective measurement by himself, the second distance in the subjective measurement cannot be easily matched to the first distance in the objective measurement. For this reason, it is possible that the first distance and the second distance do not match at the start of the subjective measurement, and the measurement proceeds in a state where the eye is actually corrected with different eye refractive powers, which may extend the measurement time. However, as in this embodiment, when the first distance and the second distance are different, the first objective eye refractive power based on the first distance is converted into the second objective eye refractive power based on the second distance and output, so that the eye to be examined can be correctly corrected with a predetermined eye refractive power even in the self-eye examination, and the subjective measurement can be performed smoothly.

[0117] In the present embodiment, a subjective optometry device that subjectively measures the ocular refractive power of a subject's eye is configured to convert a first objective value based on a first distance V1 into a second objective value based on a second distance V2, but the present invention is not limited to this. For example, a subjective optometry device that objectively measures the ocular refractive power of a subject's eye may be configured to convert a first objective value into a second objective value. In this case, the objective optometry device may measure a first objective value of the first distance V1 and receive the second distance V2 from the subjective optometry device, thereby converting the first objective value into the second objective value. [Explanation of symbols]

[0118] 1. Subjective eye examination device 11 Confirmation window 12 Observation window 30 Suppression Units 40 light source 50 Eye Refractive Index Measuring Unit 51 Forehead protector 53 Inspection window 55 Lens chamber unit 60 Visual target presentation part 70 Control section 100 Objective eye refraction measuring device 200 Self-examination device

Claims

1. An eye examination apparatus for subjectively measuring an ocular refractive power of the subject's eye, the eye examination apparatus comprising: an eye target presenting means for emitting an eye target light beam toward an eye to be examined; and a correction means for changing an optical characteristic of the eye target light beam, the eye examination apparatus comprising: an objective refractive power acquiring means for acquiring an objective refractive power in the objective measurement of the subject's eye; a first distance acquisition means for acquiring a first distance from a corneal apex of the subject's eye to a lens wearing reference position in the objective measurement of the subject's eye; a second distance acquiring means for acquiring a second distance from a corneal apex of the subject's eye to a lens wearing reference position in a subjective measurement of the subject's eye; a conversion means for converting a first objective refractive power based on the first distance into a second objective refractive power based on the second distance when the first distance and the second distance are different; an output means for outputting the second objective eye refractive power; An optometric apparatus comprising:

2. The optometric apparatus according to claim 1, An optometric apparatus comprising: a correction control means for setting an initial correction value of the correction means based on the second objective eye refractive power output from the output means.

3. In the optometric apparatus according to claim 1 or 2, The ophthalmological examination device is characterized in that the conversion means converts the first objective eye refractive power into the second objective eye refractive power when the first distance and the second distance are different and the first objective eye refractive power exceeds a predetermined threshold value.

4. The optometric apparatus according to claim 1, a detection means for detecting the second distance in the subjective measurement of the subject's eye, The optometry apparatus, wherein the second distance acquisition means acquires the second distance based on a detection result of the detection means.

5. An optometry program for use in an optometry apparatus having an optotype presenting means for emitting an optotype light beam toward an eye to be examined, and a correction means for changing an optical characteristic of the optotype light beam, the optometry program comprising: When executed by a processor of the optometry device, an objective refractive power acquisition step of acquiring an objective refractive power in an objective measurement of the subject's eye; a first distance acquiring step of acquiring a first distance from a corneal apex of the subject's eye to a lens wearing reference position in the objective measurement of the subject's eye; a second distance acquiring step of acquiring a second distance from a corneal apex of the subject's eye to a lens wearing reference position in a subjective measurement of the subject's eye; a conversion step of converting a first objective refractive power based on the first distance into a second objective refractive power based on the second distance when the first distance and the second distance are different; an output step of outputting the second objective eye refractive power; An optometry program that causes the optometry device to execute the above steps.

6. An optometry apparatus for measuring the ocular refractive power of a subject's eye, comprising: an objective refractive power acquiring means for acquiring an objective refractive power in the objective measurement of the subject's eye; a first distance acquisition means for acquiring a first distance from a corneal apex of the subject's eye to a lens wearing reference position in the objective measurement of the subject's eye; a second distance acquiring means for acquiring a second distance from a corneal apex of the subject's eye to a lens wearing reference position in a subjective measurement of the subject's eye; a conversion means for converting a first objective refractive power based on the first distance into a second objective refractive power based on the second distance when the first distance and the second distance are different; an output means for outputting the second objective eye refractive power; An optometric apparatus comprising:

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