Subjective optometry device and subjective optometry program

Abstract

This invention provides a subjective optometry device and a subjective optometry program that can reduce the possibility of subjective optometry proceeding while the patient remains in an overcorrected state. [Solution] A subjective optometry device that includes a corrective optical system for applying a corrective power to the eye under examination and examines the subjective refractive power of the eye under examination by allowing the eye under examination to view an examination target via the corrective optical system, comprises an objective refractive power acquisition means for acquiring the objective refractive power, which is the objective refractive power measured by the eye under examination, and a control means, wherein the control means performs a first control step of acquiring a correction power, which is a correction power that corrects the corrective power corresponding to the objective refractive power, by applying the corrective power corresponding to the objective refractive power to the eye under examination and obtaining the correction power obtained as the accommodative power of the eye under examination when the eye under examination focuses on an examination target at a presentation distance set during the subjective examination, and a second control step of controlling the corrective power of the corrective optical system at the start of the subjective examination based on the acquired objective refractive power and the correction power.

Description

Technical Field

[0001] The present disclosure relates to a subjective eye examination apparatus that subjectively measures the eye refractive power of a subject's eye, and a subjective eye examination program executed in the subjective eye examination apparatus.

Background Art

[0002] A subjective eye examination apparatus is known that presents an examination target to a subject's eye via a correction optical system that applies a correction power to the subject's eye, and examines the subjective eye refractive power of the subject's eye based on the subject's response regarding how the examination target appears (see Patent Document 1). When starting a subjective examination using this type of subjective eye examination apparatus, it is common practice to use the value of the objective eye refractive power obtained by an objective eye refractive power measurement apparatus as the initial value of the correction power in the correction optical system.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in objective eye refractive power measurement apparatuses, the objective eye refractive power is generally acquired using a target optically arranged at infinity. On the other hand, in a subjective examination using a subjective eye examination apparatus, the examination is performed with the examination target presented at a finite presentation distance (for example, 5 m, 3 m, 1 m, etc.). For this reason, if the value of the objective eye refractive power obtained using a target at infinity is set as the initial value, the subject's eye may be in an over-corrected state depending on the presentation distance of the examination target. In addition, at the start of the examination process in which a fogging amount is applied to the subject's eye, even if a certain amount of fogging is applied, the examination may proceed without the over-corrected state being sufficiently resolved, and the final prescription value may also become an over-corrected prescription.

[0005] In view of the above-mentioned prior art, the technical objective of this disclosure is to provide a subjective optometry device and a subjective optometry program that can reduce the possibility of subjective optometry proceeding while the eye remains in an overcorrected state. [Means for solving the problem]

[0006] To solve the above problems, this disclosure is characterized by having the following configuration. (1) A subjective ophthalmography device according to a first aspect of the present disclosure is a subjective ophthalmography device that includes a corrective optical system for applying a corrective power to an eye to be examined, and examines the subjective refractive power of an eye to be examined by causing the eye to view an examination target through the corrective optical system, and comprises an objective refractive power acquisition means for acquiring the objective refractive power which is the refractive power of the eye to be examined measured objectively, and a control means, wherein the control means is a correction power which corrects the corrective power corresponding to the objective refractive power, and is characterized by performing a first control step of acquiring a correction power which is obtained as the accommodative power of the eye to be examined when the eye to be examined focuses on an examination target at a presentation distance set during the subjective examination, and a second control step of controlling the corrective power of the corrective optical system at the start of the subjective examination based on the acquired objective refractive power and the correction power. (2) A subjective optometry program according to a second aspect of the present disclosure is a subjective optometry program that is executed in a subjective optometry device that examines the subjective refractive power of an eye by causing the eye to view an examination target via the corrective optical system, wherein the subjective optometry program is executed by the control means of the subjective optometry device. The method is characterized by: a first control step of obtaining a correction power that corrects the correction power corresponding to the objectively observed refractive power, which is obtained as the accommodative power of the eye when the eye is focused on a test target at a presentation distance set during the subjective examination, by applying the correction power corresponding to the objectively observed refractive power to the eye being examined; and a second control step of controlling the correction power of the corrective optical system at the start of the subjective examination based on the obtained objectively observed refractive power and the correction power. [Brief explanation of the drawing]

[0007] [Figure 1] This is an external view of the subjective optometry device 100. [Figure 2] This is a schematic diagram of the light projection optical system 30. [Figure 3] This is a schematic diagram of the eye refractive power measurement unit 40. [Figure 4] This is a schematic diagram of the control system for the subjective optometry device 100. [Figure 5] This is a diagram of a flowchart. [Figure 6] This is an example of the operation screen 200 of the examiner's controller 10. [Figure 7] This diagram schematically illustrates the overcorrection state of eye E under examination. [Figure 8] This is an example of the operation screen 200 of the examiner controller 10 with adjusted initial values. [Figure 9] This is a diagram of a flowchart. [Figure 10] This is an example of the operation screen 290 of the examiner's controller 10. [Figure 11]This is an example of a table showing the relationship between the inspection distance, the correction frequency of the adjustment amount, and the adjusted cloud fog amount. [Figure 12] This is a diagram of a flowchart. [Figure 13] This is an example of the operation screen 200 of the examiner's controller 10. [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 ophthalmography device of this embodiment is configured to examine the subjective refractive power of the eye being examined.

[0010] <Correction optical system> The subjective optometry device of this embodiment includes a corrective optical system. The corrective optical system is configured to impart a corrective power to the eye being examined. Furthermore, the subjective optometry device of this embodiment is configured to examine the subjective refractive power of the eye being examined by allowing the eye to view a test target via the corrective optical system.

[0011] For example, a corrective optical system may be capable of changing at least one of the spherical power, cylindrical power, and astigmatism axis angle of the corrective power by changing the optical elements. The optical elements may be at least one of the following: a spherical lens, a cylindrical lens, a cross-cylinder lens, a rotary prism, a wavefront modulation element, a variable focus lens, etc. Of course, other optical elements may also be used.

[0012] Further, for example, the correction optical system may change the spherical power of the correction power applied to the subject's eye by optically changing the presentation distance of the visual target to the subject's eye. In this case, in order to optically change the presentation distance of the visual target, the visual target presentation means may be configured to move in the optical axis direction. Further, in this case, in order to optically change the presentation distance of the visual target, an optical element (for example, a spherical lens or the like) disposed in the optical path may be configured to move in the optical axis direction.

[0013] It should be noted that the correction optical system may have a configuration combining a configuration for changing the optical element, a configuration for moving the visual target presentation means in the optical axis direction, and a configuration for moving the optical element disposed in the optical path in the optical axis direction.

[0014] For example, the correction optical system may be an eye refractive power measurement unit (for example, the eye refractive power measurement unit 40) in which an optical element is disposed in front of the eye of the subject's eye. For example, the eye refractive power measurement unit may have a variable focus lens, and may be configured to change the refractive power of the variable focus lens. Further, for example, the eye refractive power measurement unit includes a lens disk in which a plurality of optical elements are arranged on the same circumference, and a driving means (for example, a motor) for rotating the lens disk, and the driving means may be configured to electrically switch the optical elements by driving. Of course, the eye refractive power measurement unit may be configured to include a variable focus lens, a lens disk, and a driving means.

[0015] The subjective eye examination apparatus may include a target presentation unit. The target presentation unit presents a target to the eye to be examined. For example, the target presentation unit may be a display (e.g., display 31). Also, for example, the target presentation unit may be a light source and a target plate. Also, for example, the target presentation unit may be a light source and a DMD (Digital Micromirror Device). Also, for example, the target presentation unit may be a light field display. The light field display is a display capable of reproducing light rays emitted by an object by emitting different light for each direction from each pixel group unit. That is, the light field display can reproduce reflected light from an object or a light source according to the viewing position. Also, for example, the target presentation unit may be provided separately from the subjective eye examination apparatus. Also, for example, the target presentation unit does not necessarily have a light source, and may be a paper visual acuity chart or the like.

[0016] For example, the target luminous flux from the target presentation unit may be guided toward the eye to be examined 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 luminous flux emitted from the target presentation unit. As an example, it may include at least one of a lens, a mirror, and the like.

[0017] Further, in the present embodiment, the correction optical system may be configured such that an optical element is disposed between the target presentation unit and the optical member for guiding the target luminous flux from the light projection optical system toward the eye to be examined, and the optical characteristics of the target luminous flux are changed by controlling the optical element. That is, the correction optical system may have a configuration of a phantom lens refractometer (phantom correction optical system). In this case, the target luminous flux corrected by the correction optical system is guided to the eye to be examined via the optical member.

[0018] The corrective optical system may have a pair of corrective optical systems for the left and right eyes. For example, the components constituting the left eye corrective optical system and the components constituting the right eye corrective optical system may be made of the same material, or at least some of the components may be made of different material. Alternatively, for example, the left eye corrective optical system and the right eye corrective optical system may share at least some of the components constituting the left eye corrective optical system and the components constituting the right eye corrective optical system.

[0019] <Method for obtaining objective refractive power> The subjective eye examination device of this embodiment may include an objective refractive power acquisition means (for example, a control unit 60). The objective refractive power acquisition means acquires the objective refractive power of the eye being examined, which is measured objectively. For example, the objective refractive power may be at least one of the following: spherical power, cylindrical power, astigmatism axis angle, etc.

[0020] For example, the objective refractive power acquisition means may acquire the objective refractive power input by the operator's operation means (e.g., the operator's controller 10). Alternatively, for example, the objective refractive power acquisition means may read an identifier for each subject and acquire the objective refractive power stored in the identifier. As an example, the identifier may be an ID, string, one-dimensional code, two-dimensional code, color code, etc. Alternatively, for example, the objective refractive power acquisition means may acquire the objective refractive power by receiving data measured using an eye refractive power measuring device that objectively measures the objective refractive power of the subject's eye by projecting a measurement light beam onto the fundus of the subject's eye and receiving the reflected light beam of the measurement light beam reflected by the fundus.

[0021] <Control means> The subjective optometry device of this embodiment may include control means (for example, a control unit 60). For example, the control means performs a first control step and a second control step. For example, in the first control step, the setting means is configured to acquire a correction power to correct the correction power corresponding to the objective refractive power acquired by the objective refractive power acquisition means. For example, the correction power may be obtained as the accommodative power of the eye when the eye is given a correction power corresponding to the objective refractive power and the eye uses its accommodative power to focus on the test target at the presentation distance set during the subjective examination.

[0022] For example, in the second control step, the control means is configured to control the corrective power of the corrective optical system at the start of the subjective examination based on the objectively observed refractive power acquired and the corrected power acquired in the first control step. By having the first and second control steps performed by the control means, the possibility of the subjective examination proceeding in an overcorrected state can be reduced. Therefore, the possibility of the final prescription value being an overcorrection prescription can be reduced.

[0023] For example, the correction power obtained in the first control step may be based on the difference between the target distance of the target presented to the eye during objective refractive power measurement and the presentation distance of the test target presented during subjective testing. For example, if the target distance during objective refractive power measurement is fa (unit: m) and the presentation distance of the test target presented during subjective testing is f (unit: m), the correction power (unit: D (diopter)) can be calculated using the formula D = (1 / f) - (1 / fa). If the target distance during objective refractive power measurement is at infinity, it can be calculated as D = 1 / f. In other words, the correction power may be a power obtained by converting the difference between the target distance of the target presented to the eye during objective refractive power measurement and the presentation distance of the test target presented during subjective testing into a power. Furthermore, the correction power may be a power that corrects the corrective power of the corrective optical system at the start of the subjective examination so as to eliminate the accommodative power of the eye being examined that arises from the difference in the target presentation distance.

[0024] For example, after the correction power corresponding to the acquired objectively perceived refractive power is set as an initial value, the control means may, in the second control step, adjust the set initial value based on the correction power and control the corrective optical system so that the adjusted correction power is applied to the eye under examination at the start of the subjective examination.

[0025] If the start of the subjective examination coincides with the start of an examination process in which a predetermined amount of fog is applied to the eye under examination (for example, a red-green test), the control means may, in the second control step, adjust the predetermined amount of fog based on the correction power to the corrected power corresponding to the objective refractive power of the eye. This adjusted amount of fog is equivalent to the case where, at the start of the examination process in which the amount of fog is applied to the eye under examination, the predetermined amount of fog is applied to the corrected power after the initial value has been adjusted based on the correction power.

[0026] For example, the control means may obtain the correction power by calculation using the aforementioned calculation formula, or it may obtain the correction power based on a table showing the relationship between the presentation distance of the test target and the correction power, rather than obtaining the correction power by calculation. In addition, in the examination step in which a predetermined amount of fog is applied to the eye under examination, the corrected power at the start of the subjective examination may be adjusted based on a table showing the relationship between the presentation distance of the test target and the amount of fog adjusted based on the correction power.

[0027] For example, the control means may be configured to execute the first and second control steps when the presentation distance of the test target is shorter than a predetermined distance. If the presentation distance of the test target is greater than or equal to the predetermined distance, the possibility of overcorrection at the start of the subjective examination is low, even if the first and second control steps are not executed. Therefore, the examiner can proceed with the examination using the same examination policy as before.

[0028] <Means for setting presentation distance> The subjective optometry device of this embodiment may include a presentation distance setting means (for example, a control unit 60). The presentation distance setting means sets a plurality of presentation distances as the presentation distance of the test target presented during subjective examination. For example, the presentation distance of the target may be at least one of the following: distance (for example, 5.0 m), intermediate distance (for example, 1.0 m), and near distance (for example, 40 cm).

[0029] Furthermore, for example, the distance for presenting the target may include multiple distances. For example, 5.0m and 4.0m. Also, for example, the intermediate distance for presenting the target may include multiple intermediate distances. For example, 2.0m and 1.0m. Also, for example, the near distance for presenting the target may include multiple near distances. For example, 0.8m and 0.4m. Of course, the system is not limited to these examples, and the numerical values ​​for the predetermined presentation distances can be set as appropriate.

[0030] This allows the subject to adjust the initial value or amount of cloudiness to reduce the likelihood of the subject's eye being overcorrected, under corrective optical system settings corresponding to the target presentation distance, before starting subjective measurement.

[0031] At least one of the distance, intermediate distance, and near distance set by the presentation distance setting means may be set according to the country or region. For example, as an example of presentation distance for a regionally set target, if the region setting of the target is set to UK, the target presentation distance is set to 6.0m. This makes it easier to set the target presentation distance when starting a subjective test.

[0032] <Mode switching method> For example, a subjective optometry device may be equipped with a mode switching mechanism that switches between a first mode, in which the corrective power of the corrected optical system at the start of the subjective examination is set using a correction power, and a second mode, in which the corrective power is set without using a correction power. In this case, in the first mode, the examiner can proceed with the examination without hesitation using the same examination policy as before, and in the second mode, the possibility of the subjective examination proceeding in an overcorrected state can be reduced.

[0033] 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.

[0034] In this case, the subjective optometry program is executed in a subjective optometry device that includes a corrective optical system for applying a corrective power to the eye under examination, an objective refractive power acquisition means for acquiring the objective refractive power of the eye under examination which is objectively measured, and a control means, and the subjective optometry program is executed by the control means of the subjective optometry device, and the subjective optometry program is executed by the control means of the subjective optometry device to perform a correction power that corrects the corrective power corresponding to the objective refractive power, which is obtained as the accommodative power of the eye under examination when the eye under examination focuses on the test target at a presentation distance set during the subjective examination, and a second control step is performed to control the corrective power of the corrective optical system at the start of the subjective examination based on the acquired objective refractive power and the correction power.

[0035] <Examples> An embodiment of a subjective eye examination device according to this embodiment will be described.

[0036] 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 presentation window 2, a speaker 3, a holding unit 4, an examiner controller 10, a projection optical system 30 which is an example of a target presentation means, a refractive power measurement unit 40, and the like.

[0037] 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.

[0038] 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.

[0039] The examiner controller 10 is used by the examiner to operate the subjective ophthalmoscopic examination device 100. The examiner controller 10 includes a switch unit 11, a monitor 12, etc. The switch unit 11 receives signals for various settings (e.g., movement of the ocular refractive power measurement unit 40, etc.). The monitor 12 displays various information (e.g., measurement results of the eye under examination E, etc.). The monitor 12 may also function as a touch panel that also serves as the switch unit 11. Signals from the examiner controller 10 are output to the control unit 60 via wired or wireless communication.

[0040] <Light projection optics (target presentation means)> Figure 2 is a schematic diagram of the light projection optical system 30. Figure 2(a) shows the optical arrangement during distance vision testing. Figure 2(b) shows the optical arrangement during near vision testing. The light projection optical system 30 projects a target light beam toward the eye E under examination. For example, the light projection optical system 30 includes a display 31, a planar mirror 32, a concave mirror 33, a distance / near switching unit 34, etc.

[0041] The display 31 displays a visual target (e.g., a fixation target, a test target, etc.). The visual target is presented to the eye E when the light beam emitted from the display 31 forms an image on the fundus of the eye E being examined. For example, the display 31 may be an LCD (Liquid Crystal Display), an organic EL (Electro Luminescence), a plasma display, etc.

[0042] The planar mirror 32 reflects the target light beam from the display 31 and guides it to the concave mirror 33. The planar mirror 32 also reflects the target light beam from the display 31 and guides it to the eye under examination E. For example, during near vision testing of the eye under examination E, the planar mirror 32 is positioned so that the distance from the eye under examination E to the display 31 (presentation distance) is optically 40 cm. It is also possible to use reflective materials such as prisms, beam splitters, or half mirrors instead of the planar mirror 32.

[0043] The concave mirror 33 reflects the target light beam from the display 31 and guides it to the planar mirror 32. For example, the concave mirror 33 is positioned so that the distance from the eye E to the display 31 (presentation distance) is optically 5m during distance vision testing of the eye E. It is also possible to use reflective materials such as aspherical mirrors or free-form mirrors instead of the concave mirror 33. Furthermore, it is also possible to use lenses or the like instead of the concave mirror 33.

[0044] The distance / near switching unit 34 switches the arrangement of the display 31 during distance vision testing and near vision testing of the eye being examined E. For example, the distance / near switching unit 34 moves the display 31 held in the holder by moving the holder through the drive of a drive unit (motor, etc.) not shown. This switches the distance vision arrangement and near vision arrangement of the display 31.

[0045] For example, during distance vision testing of the eye under examination E, the display screen of the display 31 is directed towards the back of the housing 1 (see Figure 2(a)). The target light beam from the display 31 enters the planar mirror 32 through the optical axis L1 and is reflected by the planar mirror 32 in the direction of the optical axis L2. It also enters the concave mirror 33 through the optical axis L2 and is reflected by the concave mirror 33 in the direction of the optical axis L3. Furthermore, it enters the planar mirror 32 through the optical axis L3 and is reflected by the planar mirror 32 in the direction of the optical axis L4. As a result, the target light beam, which has passed through each optical component inside the housing 1 and is emitted to the outside of the housing 1, is projected onto the eye under examination E.

[0046] For example, during a near vision test of the eye under examination E, the display screen of the display 31 is directed towards the top surface of the housing 1 (see Figure 2(b)). The target light beam from the display 31 enters the plane mirror 32 passing through the optical axis L3 and is reflected by the plane mirror 32 in the direction of the optical axis L4. As a result, the target light beam, which has passed through each optical component inside the housing 1 and exited to the outside of the housing 1, is projected onto the eye under examination E.

[0047] In this embodiment, during the intermediate examination of the eye E under test, the presentation distance of the target is changed by driving a drive unit 35 that moves the display 31 in the direction of the optical axis L1. Alternatively, the presentation distance of the target to the eye E under test may be optically changed by, for example, a configuration that switches and arranges multiple optical elements in the optical path. Alternatively, the presentation distance of the target may be optically changed by, for example, a configuration that moves a lens placed in the optical path in the optical axis direction. As a result, the eye E under test is projected with a target light beam that has been emitted to the outside of the housing 1 via each optical member inside the housing 1, and whose presentation distance has been changed.

[0048] <Ocular refractive power measurement unit (corrective optical system)> Figure 3 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 an example of a corrective optical system. The corrective optical system is placed in the optical path of the light projection optical system 30 and applies a corrective power to the eye being examined. 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.

[0049] 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).

[0050] 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.

[0051] The lens unit 42 includes a lens disc 50 inside. The lens disc 50 has a pair of left and right lens discs: a left lens disc 50L and a right lens disc 50R. The lens disc 50 is rotated by the drive of the drive unit 51 (left drive unit 51L and right drive unit 51R).

[0052] Furthermore, the lens disc 50 has an aperture (or a 0D lens) and multiple optical elements 52 (left optical element 52L and right optical element 52R) arranged on the same circumference. These optical elements are rotated by the drive unit 53 (left drive unit 53L and right drive unit 53R). This allows the desired optical element 52 to be switched and positioned in the inspection window 43 at the desired angle.

[0053] The lens disc 50 consists of one lens disc or multiple lens discs. For example, a spherical lens disc, a cylindrical lens disc, an auxiliary lens disc, etc., may be provided. For example, a spherical lens disc may have multiple spherical lenses with different spherical powers (spherical refractive powers). For example, a cylindrical lens disc may have multiple cylindrical lenses with different cylindrical powers (cylindrical refractive powers). For example, an auxiliary lens disc may have a shielding plate, a polarizing filter, a red filter / green filter, a dispersion prism, a Maddox lens, a rotary prism, a cross cylinder lens, an auto cross cylinder lens, an alignment lens, etc. A drive unit 51 and a drive unit 53 may be provided for each lens disc.

[0054] <Department Head> Figure 4 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. The CPU controls the operation of each part of the subjective optometry device 100. Various types of information are temporarily stored in the RAM. Various programs executed by the CPU are stored in the ROM. Note that the control unit 60 may be composed of multiple control units (i.e., multiple processors).

[0055] The control unit 60 is connected to a speaker 3, a display 31, an examiner controller 10, a non-volatile memory 70 (hereinafter referred to as memory 70), 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, 51, 53), etc. The control unit 60 is also connected to an objective eye refractive power measurement device 300.

[0056] Memory 70 is a non-transient storage medium that can retain its contents even when the power supply is cut off. For example, memory 70 can be a hard disk drive, flash ROM, USB memory, etc.

[0057] In this disclosure, the term "processor" refers to one or more hardware processors configured to execute program code contained in a program (i.e., one or more instructions of a program). In other words, a "processor" is a hardware device capable of performing one or more programmed operations. For example, a "processor" may be a general-purpose or application-specific processor and may be at least one of a CPU, microprocessor, GPU, and DFP (Data Flow Processor).

[0058] In this disclosure, the term “memory” refers to one or more hardware memories that are non-transitional tangible recording media configured to record at least one of computer program code and data in a manner accessible from a processor. “Memory” can be implemented by memory technologies such as SRAM, SDRAM, non-volatile / flash type memory, or other types of memory. The computer program code that constitutes the program is recorded in memory and executed by the processor to realize various functions in the eyeglass lens processing apparatus 1.

[0059] In this disclosure, the term “circuit” refers to one or more logic circuits as hardware, configured to enable the eyeglass lens processing apparatus 1 to perform functions. In other words, “circuit” refers to one or more non-programmable devices. For example, “circuit” could be a custom IC designed to be non-programmable for a specific application.

[0060] In this disclosure, at least one of a circuit and a processor having memory storing computer program code enables the eyeglass lens processing apparatus 1 to function. The expression "at least one of a circuit and a processor" should be interpreted as disjunctive (logical OR) and not as at least one circuit and at least one processor.

[0061] <Control operation> The control operation of the optometry device 100, which has the above configuration, will be explained in detail with reference to the flowchart in Figure 5.

[0062] <Eye positioning: S1> First, the examiner operates the examiner controller 10 to select a switch (not shown) to lower the 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 10. For example, this moves the refractive power measurement unit 40 to the examination position (see Figure 1(b)) and positions the refractive power measurement unit 40 on the optical axis L4. Next, the examiner aligns the eye E to the refractive power measurement unit 40. The examiner adjusts the corneal vertex distance VD to match the interpupillary distance PD of the eye. This completes the alignment of the eye E.

[0063] <Acquisition of objective refractive power: S2> Next, the examiner obtains the objective refractive power of the eye E under examination, which is measured objectively. For example, the objective refractive power is obtained by obtaining the objective refractive power measured in advance using the objective refractive power measuring device 300. The examiner operates the examiner controller 10 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 300 to transmit the objective refractive power associated with the subject ID, based on the input signal from the switch. When the control unit of the objective refractive power measuring device 300 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 300. As a result, the control unit 60 can obtain the objective refractive power of the eye E under examination. For example, in this embodiment, let's assume that both the right and left eyes obtained objective refractive powers with a spherical power of -3.00D, a cylindrical power of 0.00D, and an astigmatism axis angle of 0D. Note that in this embodiment, for the sake of clarity, the cylindrical power of the objective refractive power is assumed to be 0.00D.

[0064] <Initial value setting: S3> Next, the examiner sets the initial values ​​for the subjective examination. Figure 6 shows an example of the operation screen 200 of the examiner controller 10. For example, the operation screen 200 displays objective buttons 210, subjective buttons 220, a field for the corrected value of the eye E under examination 230, an objective value field 232, an initial value button 240, a test distance selection button 250, etc. The operation screen 200 also has a target selection field 245 for selecting the test target to be presented during the subjective examination.

[0065] The objective button 210 displays the acquired objective refractive power in the corrected value field 230 of the eye under examination E. The subjective button 220 switches to a screen for making various settings during subjective examination. The corrected value field 230 of the eye under examination E displays the corrected power applied to the eye under examination. The initial value button 240 is for setting the initial values ​​for starting the subjective examination.

[0066] The operation screen 200 is provided with various buttons (switches) for setting the examination distance (S3), which will be described later. The examination distance selection button 250 has multiple selection buttons to set multiple presentation distances for the examination target presented during the subjective examination. In this embodiment, the examination distance selection button 250 includes a button 251 indicating the distance, a button 252 indicating the intermediate distance, a button 253 indicating the near distance, etc. By the examiner operating the examiner controller 10 and selecting a distance selection button 250, the presentation distance of the target presented to the eye E under examination is changed. In this embodiment, the distance distance is set to 5.0m, the intermediate distance to 1.0m, and the near distance to 0.4m, respectively, as the examination distances.

[0067] Regarding the setting of initial values, the examiner operates the examiner controller 10 to select the objective button 210. The control unit 60 displays the objective refractive power acquired in step S2 in the objective value column 232 in response to the operation signal from the examiner controller 10. The objective value column 232 has two columns, one for the right eye and one for the left eye. Next, the examiner operates the examiner controller 10 to select the subjective button 220. The control unit 60 displays a screen for setting each aspect of the subjective examination in response to the operation signal from the examiner controller 10. Next, the examiner operates the examiner controller 10 to select the initial value button 240. The control unit 60, in response to an operation signal from the examiner controller 10, copies the objective refractive power value in the objective value column 232 and displays it in the corrected value column 230. It also drives the refractive power measurement unit 40 (corrective optical system) to place an optical element corresponding to the corrected power (the same power as the objective refractive power in this embodiment) in the examination window 43. This sets the initial values ​​for starting the subjective examination. In this embodiment, the initial values ​​for both the right and left eyes are set to a spherical power of -3.00D, a cylindrical power of 0.00D, and an astigmatism axis angle of 0 degrees. Note that the initial values ​​for the corrected power in the refractive power measurement unit 40 and the corrected value column 230 may be set not by the initial value button 240, but by the operation of the subjective button 220, which copies the objective refractive power value based on that operation signal.

[0068] <Inspection distance setting: S4> Next, the examiner sets the presentation distance (in other words, the test distance) of the test target when conducting the subjective test. The examiner operates the examiner controller 10 to select the presentation distance of the test target to be displayed on the operation screen 200. For example, if the subject requests eyeglass lenses (prescription) that prioritize visibility at a working distance of 1.0m, the examiner selects the button 252 indicating the intermediate distance from among the multiple test distance selection buttons 250. The control unit 60 controls the drive unit 35 of the near / far switching unit 34 in response to the operation signal from the examiner controller 10, and switches the display 31 to the intermediate position so that the presentation distance of the test target becomes 1.0m.

[0069] <Acquisition of correction frequency for overcorrection reduction: S5> The control unit 60 acquires a correction power to reduce overcorrection based on the presentation distance of the test target presented during subjective eye examination. In this embodiment, the objective refractive power obtained at an infinity target presentation distance is used as the initial value, and in subjective examination, the test target is presented at a presentation distance of 1.0 m. Therefore, in this step, a correction power SK is acquired to reduce the possibility of the eye being overcorrected due to this difference in presentation distance. This adjusts the correction power of the corrective optical system at the start of subjective examination.

[0070] Figure 7 schematically illustrates the overcorrected state of the eye E under examination due to differences in the presentation distance of the test target, and the corrected state in which overcorrection is prevented. Figure 7(a) shows the state in which the presentation distance of the test target is infinity, similar to the measurement using the objective eye refractive power measuring device 300, and the corrective power corresponding to the objective eye refractive power obtained in step S2 (in this embodiment, -3.00D) is applied to the eye under examination. In this case, the target light beam L4 from the target placed optically at infinity is imaged at the fundus position t1 when the eye under examination E is in a state where the accommodative power of the lens S is not being used (accommodation release state). That is, in Figure 7(a), the eye under examination E is in an accommodation release state and is focused on the test target placed at infinity.

[0071] Figure 7(b) shows a state where the corrective power applied to the eye E is the same as in Figure 7(a), corresponding to the objective refractive power, and the presentation distance of the test target is shorter than that used when measuring the objective refractive power (1.0 m in this embodiment). In this case, the target light beam L4 from the target at a distance of 1.0 m will focus at a position t2 behind the fundus when the eye E is not using its accommodative power. In this case, as shown by the dotted line, the eye E can change the thickness of its lens S (use its accommodative power) to position the image of the target light beam L4 at the fundus position t1. In other words, when the presentation distance of the test target is shorter than that used when measuring the objective refractive power, if the corrective power is the same as the objective refractive power, the eye E will be overcorrected. If the eye E being examined is overcorrected, the subject may report that they saw the test target correctly by using their eye's accommodative power during the subjective examination, potentially leading to inaccurate test results.

[0072] Figure 7(c) shows the state in which a correction power SK, which reduces the overcorrection of the eye under examination E, is added to the correction power of the objectively awake eye, compared to Figure 7(b). In Figure 7(b) above, if a correction power SK equivalent to the accommodative power of the eye under examination E when it uses its accommodative power to focus is added to the correction power of the objectively awake eye, the eye under examination E can focus the target light beam L4 from the test target at a presentation distance of 1.0 m onto the fundus position t1, even in an unaccommodated state. In other words, the eye under examination E can focus on the test target at a presentation distance of 1 m without using its accommodative power.

[0073] The correction power SK shown in Figure 7(c) can be determined based on the difference between the target distance of the target presented to the eye during objective refractive power measurement and the presentation distance of the test target presented during subjective testing. For example, if the target distance during objective refractive power measurement is fa (unit: m) and the presentation distance of the test target presented during subjective testing is f (unit: m), the correction power SK (unit: D (diopter)) can be calculated using the formula D = (1 / f) - (1 / fa). When the target distance during objective refractive power measurement is at infinity, D = 1 / f. In this embodiment, since the presentation distance of the target is set to 1.0m (step S4), the correction power SK is +1.00D.

[0074] <Initial value adjustment: S6> In this embodiment, the control unit 60 adjusts the initial value set in step S3 based on the correction power SK. Figure 8 shows an example of the operation screen 200 of the examiner controller 10 after the initial value has been adjusted. For example, the control unit 60 sets the spherical power of -2.00D, which is the sum of the spherical power of the objectively observed eye's refractive power of -3.00D obtained in step S2 and the correction power SK of +1.00D obtained in step S5 according to the presentation distance of the visual target, as the corrected power at the start of the subjective examination, and displays the adjusted corrected power in the corrected value column 230 of the eye E being examined. The control unit 60 also controls the drive of the eye refractive power measurement unit 40 (corrective optical system) and places the optical element with the adjusted corrected power in the examination window 43. The adjusted corrected power may also be marked with an asterisk (e.g., "*"), a change in text color, etc.

[0075] As a result, as shown in Figure 7(c), the target light beam is focused at position t1 in the fundus without the eye E exerting its accommodative power, allowing the subjective examination to begin with reduced overcorrection. Therefore, the possibility of the subjective examination progressing while the eye is overcorrected can be reduced.

[0076] <Start of self-awareness testing: S7> For example, the subjective measurement of eye E involves the following tests in order: red-green test (R / G test), astigmatism test, second red-green test (R / G test), visual acuity test, binocular balance test, etc. For example, the initial red-green test is to adjust the spherical power set at the start of the subjective test to a more appropriate spherical power. For example, the astigmatism test is to adjust the cylindrical power and astigmatism axis angle set at the start of the subjective test to a more appropriate cylindrical power and astigmatism axis angle. The second red-green test is to prevent overcorrection of the spherical power and obtain the best visual acuity. For example, the visual acuity test is to obtain the monocular full correction power that yields the best visual acuity value for eye E. The binocular balance test is to check how well the target is seen in both eyes in relation to the monocular full correction power of both eyes and adjust the balance of the corrective powers of the left and right eyes. Based on these subjective tests, the prescription values ​​for eyeglasses are determined.

[0077] This embodiment describes the red-green test at the start of the subjective examination. The examiner operates the examiner controller 10 and selects the red-green target switch located in the target selection field 245 to start the red-green test of the eye E under examination. The control unit 60 displays the red-green targets on the display 31 in response to the input signal from the examiner controller 10. When the control unit 60 receives an operation signal for the red-green target switch, it controls the refractive power measurement unit 40 (corrective optical system) based on that input signal to apply a predetermined amount of haze (for example, +0.50D) to the corrected power placed in the examination window 43. In this embodiment, the spherical power of the corrective optical system to which the correction power SK of +1.00D has been added becomes -2.00D, and when the amount of haze of +0.50D is added to this, the spherical power of the corrected power at the start of the red-green test becomes -1.50D.

[0078] Furthermore, the assignment of cloud / fog levels in the red-green test at the start of the subjective assessment may not be automatically performed based on the operation signal of the red-green target switch, but rather the examiner may operate a dial switch (not shown) located on the examiner controller 10 to appropriately assign and change the cloud / fog levels.

[0079] The red-green test determines whether the subject's eye E, corrected to the desired spherical power, is nearsighted, emmetropic, or farsighted. For example, if the subject can clearly see the test target, red indicates nearsightedness, green indicates farsightedness, and if both are clearly visible, it indicates emmetropia.

[0080] Based on the subject's response to the test target, the examiner changes the spherical power correcting the subject's eye E by operating a switch located on the switch unit 11. For example, the step (stage) of changing the spherical power correcting the subject's eye E can be changed in increments of 0.25D. For example, if the subject responds that they can clearly see the red target, the examiner determines that the subject's eye E is myopic and changes the spherical power of the subject's eye E by one step to the negative side (in this case, -0.25D is added to the current -1.50D to change it to -1.75D). Furthermore, the examiner repeats changing the spherical power correcting the subject's eye E one step at a time based on the subject's response to the test target. If the subject responds that they can see the red and green targets to the same degree, the examiner determines that the subject's eye E is emmetropic and ends the test. For example, if the subject reports being able to clearly see the green target, the examiner will determine that eye E is hyperopic and change the spherical power of eye E by one step to the positive side. If it is determined that eye E is emmetropic, the initial red-green test is completed. Subsequently, astigmatism testing, a second red-green test, visual acuity testing, etc., are performed in order until the full corrected power for the right eye is obtained, and the subjective examination of the right eye is completed. The examiner will then perform a similar subjective examination of the left eye, and once the subjective examination of the left eye is completed, an examination will be performed to adjust the power of both eyes in a binocular balance test, for example, to obtain the final prescription value and complete the subjective examination.

[0081] <Example of transformation> In the above embodiment, the corrected power at the start of the subjective examination based on the corrected power SK is adjusted based on the corrected power SK by operating the adjustment switch 240, which is set to an initial value corresponding to the objective refractive power of the eye. However, the embodiment is not limited to this. For example, since the subjective examination starts with the red-green test, in which a certain amount of fog is applied to the eye under examination, the predetermined amount of fog applied to the eye under examination during this red-green test (in the above embodiment, +0.50D) may be adjusted based on the corrected power SK. That is, at the start of the subjective examination, which is the start of the red-green test, the control unit 60 adjusts the predetermined amount of fog applied to the eye under examination based on the corrected power SK, in relation to the corrected power corresponding to the objective refractive power of the eye. In this embodiment, the predetermined amount of fog of +0.50D is added to the corrected power SK of +1.00D, so that a fog of +1.50D is applied to the eye under examination. This adjusted amount of fog is equivalent to the case where a predetermined amount of fog is applied to the corrected power after the initial value has been adjusted based on the corrected power SK, at the start of the Red-Green test, which is the start of the subjective test, as shown in the flowchart of Figure 5 above.

[0082] Figure 9 is a flowchart of the above-mentioned modification example (a modification example in which the amount of cloud cover is adjusted based on the correction frequency SK), and the cloud cover adjustment step S6 is changed compared to the flowchart in Figure 5.

[0083] Furthermore, the adjustment of the corrected power SK at the start of the subjective examination is not limited to the above-mentioned examples and the above-mentioned examples of changes, and may be a combination of adjusting the initial value and adjusting the amount of cloud cover.

[0084] Furthermore, in the above embodiment, the acquisition of the correction frequency SK corresponding to the presentation distance (test distance) of the test target was assumed to be obtained by calculation (D=1 / f) by the control unit 60, but this is not limited to this. For example, the correction frequency SK may be acquired based on a table (data relating the correction frequency SK to the test distance) that is stored in the memory 70 in advance. Also, regarding the adjusted amount of cloud cover in the above transformation example, the adjustment amount may be acquired based on a table stored in the memory 70.

[0085] Figure 11 is an example of Table 400 showing the relationship between the examination distance (distance of the visual target) 401, the correction power SK of the adjustment amount 402, and the adjusted haze amount 403. In the example of Table 400 in Figure 11, the examination distance is assumed to change in 1.0m steps between 5.0m and 1.0m, but the examination distance may change in finer steps. If the change in correction power by the refractive power measurement unit 40 (corrective optical system) is in 0.25D steps, then any adjustment amount and haze amount corresponding to the examination distance that are not integer multiples of 0.25D should be rounded to the value that increases in 0.25D steps.

[0086] Furthermore, in the above embodiments and modification examples, the correction power KS and the amount of cloudiness are changed according to the difference in the presentation distance (test distance) of the test target, but this is not limited to this. For example, if the presentation distance of the test target is shorter than a predetermined presentation distance, the correction power of the corrective optical system at the start of the subjective test may be adjusted based on the correction power KS.

[0087] Figure 12 shows a flowchart of the operation control in this modified example. In the flowchart of Figure 12, a step S10 is added after the step S4 of setting the test distance to determine whether the test distance (the distance at which the test target is presented) is shorter than a predetermined distance. For example, if the test distance is set to be shorter than 5.0m in step S4 (if S10 is YES), then, as in the flowchart of Figure 5, the process proceeds to the step of obtaining the corrected frequency KS (S5), the step of obtaining the corrected frequency (S6), and then to the subjective test step (S7).

[0088] On the other hand, if the examination distance is set to 5.0m or more in step S4 (if S10 is NO), the steps for obtaining the corrected power KS (S5) and the corrected power acquisition step (S6) are omitted, and the process proceeds to the subjective examination step (S7). In other words, if the examination distance is 5m or more, the subjective examination begins with the corrected power corresponding to the objective refractive power set to the initial value, as in the conventional method. When the examination distance is 5m, the corrected power KS becomes 0.20D using the calculation formula (D=1 / f), which is smaller than the 0.25D step of typical spectacle lens power steps, making overcorrection unlikely. Therefore, even if adjustments based on the corrected power KS are omitted when disclosing the subjective examination results, there are few practical problems. In this modified example, if the examination distance is set to 5.0m or more, the examiner can proceed with the subjective examination using the same eye examination policy as in the conventional method.

[0089] Furthermore, the addition of step S10, which determines whether the test distance for the above-mentioned variability (the presentation distance of the test target) is shorter than a predetermined distance, may be applied to the case of a variability example (flowchart in Figure 9) where the amount of cloud fog is adjusted based on the correction frequency SK.

[0090] Furthermore, in the above embodiment, the correction power of the corrective optical system at the start of the subjective examination was adjusted (set) using a correction power SK corresponding to the examination distance, but it is not always necessary to adjust the correction power using the correction power SK. For this reason, for example, the subjective optometry device 100 may be provided with a mode switching means that can switch between a first mode in which the correction power of the corrective optical system at the start of the subjective examination is adjusted (set) using the correction power SK, and a second mode in which it is adjusted (set) without using the correction power. For example, as shown in Figure 13, a switching button 241 for inputting a signal to switch between the first mode and the second mode may be provided on the operation screen 200 of the examiner controller 10. In this case, the switching button 241 functions as a mode switching means. In this modified example, in the first mode, the subjective examination can be started by setting the correction power of the objective eye refractive power as is to the initial value, just as in the conventional method, and the examiner can proceed with the examination without hesitation using the same optometry policy as in the conventional method. In the second mode, the possibility of subjective assessments progressing while the teeth are still in an overcorrected state can be reduced. [Explanation of Symbols]

[0091] 1 cabinet 2. Presentation window 10. Examiner's Controller 30 Floodlight Optics 31 displays 40. Refractive power measurement unit 43 Inspection window 60 Control Unit 100 Self-aware eye examination device

Claims

1. A subjective optometry device that includes a corrective optical system for applying a corrective power to the eye under examination, and examines the subjective refractive power of the eye under examination by allowing the eye under examination to view an examination target through the corrective optical system, The system comprises an objective refractive power acquisition means for acquiring the objective refractive power of the eye under examination, and a control means, The control means is A first control step of obtaining a correction power that corrects the correction power corresponding to the objectively observed refractive power, wherein the correction power corresponding to the objectively observed refractive power is applied to the eye under examination, and the correction power obtained is the accommodative power of the eye under examination when the eye under examination focuses on the test target at the presentation distance set during the subjective examination. A second control step controls the corrective power of the corrective optical system at the start of the subjective examination based on the acquired objective refractive power and the corrected power, A subjective optometry device characterized by performing the following actions.

2. In the subjective ophthalmoscopic device described in claim 1, The subjective optometry device is characterized in that the correction power is obtained based on the difference between the target distance of the target presented to the eye under examination during the measurement of the objective refractive power of the eye and the presentation distance of the test target presented during the subjective examination.

3. In the subjective ophthalmoscopic device described in claim 1, The aforementioned subjective examination begins at the start of the examination process in which the amount of cloudiness is applied to the eye being examined. The control means is characterized by adjusting the amount of cloudiness based on the correction power, and is a subjective optometry device.

4. In the subjective ophthalmoscopic device according to any one of claims 1 to 3, The control means is characterized in that it executes the first control step and the second control step when the presentation distance of the test target is shorter than a predetermined distance.

5. In the subjective ophthalmoscopic device according to any one of claims 1 to 4, A subjective optometry device characterized by comprising a mode switching means for switching between a first mode in which the corrective power of the corrective optical system at the start of the subjective examination is set using the correction power, and a second mode in which the corrective power is set without using the correction power.

6. In the subjective ophthalmoscopic device according to any one of claims 1 to 5, A subjective optometry device further comprising presentation distance setting means for setting a plurality of presentation distances as the presentation distance of the test target presented during the subjective examination.

7. In the subjective ophthalmoscopic device described in claim 6, A subjective optometry device characterized in that the presentation distance of the test target set by the presentation distance setting means is at least one of the following: distance, intermediate distance, and near distance.

8. In the subjective ophthalmoscopic device described in claim 7, A subjective optometry device characterized in that at least one of the distance, intermediate, and near viewing distances set by the presentation distance setting means is set according to the country or region.

9. A subjective optometry program is performed in a subjective optometry device that includes a corrective optical system for assigning a corrective power to the eye under examination, an objective refractive power acquisition means for acquiring the objective refractive power of the eye under examination which is objectively measured, and a control means, and the subjective refractive power of the eye under examination is examined by having the eye under examination view an examination target via the corrective optical system. The subjective eye examination program is executed by the control means of the subjective eye examination device, A first control step of obtaining a correction power that corrects the correction power corresponding to the objectively observed refractive power, wherein the correction power corresponding to the objectively observed refractive power is applied to the eye under examination, and the correction power obtained is the accommodative power of the eye under examination when the eye under examination focuses on the test target at the presentation distance set during the subjective examination. A second control step controls the corrective power of the corrective optical system at the start of the subjective examination based on the acquired objective refractive power and the corrected power, A subjective eye examination program characterized by performing the following actions.

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