Optometry Control Program

Abstract

To provide an eye examination program which can accurately measure a subject eye.SOLUTION: A self eye examination program included in an eye examination control program executed by a self eye examination device comprises: the first acquisition step of acquiring the rough spherical dioptric power obtained by subjectively measuring a subject eye; and the second acquisition step of acquiring the final spherical dioptric power obtained by finely adjusting the rough spherical dioptric power, the second acquisition step being executed after the first acquisition step. The second acquisition step comprises: the examination starting step of setting the initial dioptric power correcting the subject eye by controlling correction means on the basis of the rough spherical power and starting the progress procedure to execute the examination in the state where the subject eye is corrected with the initial dioptric power; the answer detection step of detecting correctness of the answer of the test subject during the execution of the progress procedure; and the uncorrected state confirmation step of confirming whether or not the subject eye is in the uncorrected state on the basis of the correctness of the answer detected in the answer detection step.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to an optometry control program executed in a subjective optometry device that subjectively measures optical characteristics of a subject's eye. [Background technology]

[0002] There is known a subjective optometry device that measures the optical characteristics of a subject's eye by placing an optical element in front of the subject's eye and presenting a test target to the subject's eye via the optical element (see Patent Document 1). For example, using such a subjective optometry device, the correction power for correcting the subject's eye can be appropriately adjusted. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-18712 A Summary of the Invention [Problem to be solved by the invention]

[0004] Conventionally, the examiner is present with the examinee and adjusts the correction power of the examinee's eye in response to the examinee's answers. However, recently, self-eye examinations have been considered as a mechanism for easily performing subjective examinations of the examinee's eye. In self-eye examinations, even if the corrective power of the examinee's eye is not appropriate (for example, the corrective power is insufficient and the eye is not corrected), the examination proceeds automatically, so there are cases where accurate measurement results cannot be obtained.

[0005] In view of the above-described conventional techniques, the present disclosure has as its technical object to provide an eye examination control program capable of measuring a subject's eye with high accuracy. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention is characterized by having the following configuration.

[0007] The eye examination control program according to the present disclosure is an eye examination control program executed in a subjective eye examination device having an eye test target presenting means for presenting a test target to an eye to be examined and a correction means for changing optical characteristics of an eye test target light beam emitted from the eye test target presenting means, and includes a self-eye examination program for automatically proceeding with the eye examination based on an answer input by an examinee visually recognizing the test target, the self-eye examination program including a first acquisition step for acquiring a rough spherical power obtained by subjectively measuring the eye to be examined, and a second acquisition step, which is executed after the first acquisition step, for acquiring a final spherical power obtained by finely adjusting the rough spherical power, a second acquisition step of acquiring the final spherical power by controlling at least one of the optotype presenting means and the correcting means and executing a progression procedure for acquiring the final spherical power, the second acquisition step including: a test start step of setting an initial power for correcting the eye to be examined by controlling the correcting means based on the rough spherical power, and starting the progression procedure to carry out the test in a state in which the eye to be examined is corrected with the initial power, an answer detection step of detecting whether answers of the subject are corrected during the progression procedure, and an uncorrected confirmation step of confirming whether the eye to be examined is in an uncorrected state or not based on the correctness of the answers detected in the answer detection step, The uncorrected confirmation step includes a first spherical power adding step of presenting a test optotype having a predetermined visual acuity value to the subject, and adding a first spherical power stronger than a current correction power for correcting the subject's eye when the answer is detected as an incorrect answer, and an uncorrected confirmation ending step of presenting a test optotype having the predetermined visual acuity value to the subject, and ending the uncorrected confirmation step when the answer is detected as an incorrect answer in a state where the subject's eye has been corrected with the first spherical power, The final spherical power is obtained based on the confirmation result in the uncorrected confirmation step. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is an external view of a subjective optometry device. [Diagram 2] FIG. 2 is a schematic diagram of a projection optical system. [Diagram 3] FIG. 2 is a schematic diagram of an eye refractive power measuring unit. [Figure 4] FIG. 2 is a schematic diagram of a control system of the subjective optometry device. [Diagram 5] This is an example of the flow of the first step. [Figure 6]This is an example of the flow of the second step. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] <Summary> An embodiment of an optometry control program according to the present disclosure will be described. The items classified in <> below can be used independently or in conjunction with each other.

[0010] The optometry control program in this embodiment is executed in a subjective optometry device that has a target presenting means (e.g., a display 31) that presents a test target to the subject's eye and a correction means (e.g., an eye refractive power measuring unit 40) that changes the optical characteristics of the target light beam emitted from the target presenting means, and that subjectively measures the optical characteristics of the subject's eye. Alternatively, the program is executed in a subjective optometry system that includes such a subjective optometry device.

[0011] <Self-eye examination program> The eye examination control program in this embodiment includes a self-eye examination program that automatically proceeds with the eye examination based on the answer entered by the subject after visually checking the test optotype. The control means (e.g., the control unit 60) included in the subjective eye examination device executes the self-eye examination program, so that the eye examination (measurement) of the subject proceeds appropriately even without the examiner being present.

[0012] <First acquisition step> The self-eye examination program may include a first acquisition step. The first acquisition step is a step of acquiring a rough spherical power obtained by subjectively measuring the eye to be examined. In other words, it is a step of acquiring a provisional spherical power based on a subjective measurement of the eye to be examined, for roughly correcting the eye to be examined. The rough spherical power of the eye to be examined may be a spherical power obtained by presenting a test optotype (described later) different from the visual acuity test optotype to the eye to be examined. In other words, it may be a spherical power obtained by a test that does not measure the visual acuity value of the eye to be examined. For example, it may be a spherical power obtained by performing a red-green test and presenting a red-green optotype.

[0013] For example, in the first acquisition step, a rough spherical power obtained by measuring the eye to be examined in advance may be acquired by inputting the rough spherical power by the examiner operating an operation means (for example, the examiner controller 10). The rough spherical power obtained in advance may be acquired by receiving data from another device. As an example, the rough spherical power may be acquired by receiving a measurement result measured using a subjective optometry device different from the subjective optometry device used in the self-eye examination, a past measurement result linked to examinee information (ID, etc.), or the like. The rough spherical power may be acquired based on a measurement result measured in a series of steps of the self-eye examination. In this case, the subjective optometry device may be provided with a configuration for obtaining a rough spherical power of the eye to be examined, and the first acquisition step may include a step for measuring the rough spherical power.

[0014] <Second acquisition step> The self-eye examination program may include a second acquisition step. The second acquisition step is executed after the first acquisition step. The second acquisition step is a step of acquiring a final spherical power obtained by finely adjusting the rough spherical power, and is a step of acquiring the final spherical power by controlling at least one of the optotype presenting means and the correcting means and executing a progress procedure for acquiring the final spherical power. That is, the second acquisition step may include a process of controlling at least one of the optotype presenting means or the correcting means based on the answer of the subject, and measuring the final spherical power obtained by finely adjusting the rough spherical power. The final spherical power of the subject's eye may be a spherical power obtained by presenting a visual acuity test optotype to the subject's eye. That is, it may be a spherical power obtained in a test to measure the visual acuity value of the subject's eye. For example, it may be a spherical power obtained by performing a corrective visual acuity test and presenting a Landolt ring optotype.

[0015] For example, in the second acquisition step, the final spherical power may be acquired as the most positive correction power value (i.e., the perfect correction value) that provides the best visual acuity of the subject's eye. Also, for example, in the second acquisition step, the final spherical power may be acquired as the correction power value that provides a predetermined visual acuity of the subject's eye and as a value (i.e., the prescription value) that is used when prescribing spectacles.

[0016] The second acquisition step may be a step of presenting a test target having a different visual acuity value from that of the first acquisition step. As an example, in this case, the visual acuity values ​​of the first acquisition step and the second acquisition step may be any of separate visual acuity values ​​(e.g., 0.3 and 0.7, etc.), adjacent visual acuity values ​​(e.g., 0.6 and 0.7, etc.), and partially overlapping visual acuity values ​​(e.g., 0.3 to 0.7 and 0.7 to 2.0, etc.).

[0017] In this embodiment, the visual acuity value of the test optotype presented to the subject's eye in the first acquisition step may be smaller than the visual acuity value of the test optotype presented in the second acquisition step. For example, in the first acquisition step, a test optotype different from the visual acuity test optotype (in other words, a test optotype having a predetermined visual acuity value and used for a purpose other than visual acuity testing) may be used as a test optotype having a smaller visual acuity value. As an example, a red-green optotype or the like may be used. For example, in the second acquisition step, a visual acuity test optotype (in other words, a test optotype having a predetermined visual acuity value and used for visual acuity testing) may be used as a test optotype having a larger visual acuity value than that in the first acquisition step. As an example, a Landolt ring optotype or the like may be used. In this case, it is difficult to notice that the correction state of the subject's eye is not appropriate (more specifically, the subject's eye is in an uncorrected state) in the first acquisition step, and even if the rough spherical power thus obtained in the second acquisition step is fine-tuned, the final spherical power may not be obtained with high accuracy. However, in this embodiment, by providing an uncorrected confirmation step (described later) in the second obtaining step, it is possible to appropriately change the spherical power even in such a configuration and obtain the final spherical power with high accuracy.

[0018] The second acquisition step may be a step of performing a test different from the first acquisition step. That is, the second acquisition step may be a step of performing a test for obtaining a final spherical power, which is a test different from the test for obtaining a rough spherical power. For example, the first acquisition step may obtain a rough spherical power measured by presenting a test optotype different from the visual acuity test optotype to the subject's eye. As an example, the first acquisition step may at least perform a red-green test in which a red-green optotype or the like is presented as a test optotype different from the visual acuity test optotype. Of course, in the first acquisition step, in addition to the red-green test, a cross cylinder test in which a point cloud optotype or the like is presented as a test optotype different from the visual acuity test optotype may be performed. For example, the second acquisition step may obtain a final spherical power measured by presenting a visual acuity test optotype to the subject's eye. As an example, the second acquisition step may perform a corrective visual acuity test in which a Landolt ring optotype or the like is presented as a visual acuity test optotype.

[0019] <Inspection start step> The second obtaining step may include an examination starting step. The examination starting step is a step of setting an initial power for correcting the eye to be examined by controlling the correction means based on the rough spherical power, and starting a procedure to perform the examination in a state in which the eye to be examined is corrected with the initial power. For example, the eye to be examined may be corrected with the initial power by placing a spherical lens in front of the eye to be examined based on the rough spherical power of the eye to be examined. The initial power may be the same as the rough spherical power, or may be a power obtained by adding a predetermined spherical power (e.g., -0.25D, etc.) to the rough spherical power.

[0020] <Answer detection step> The second acquisition step may include an answer detection step. The answer detection step is a step of detecting whether an answer of the subject is correct during the execution of the progress procedure. The answer detection step may detect whether the answer is correct based on the answer of the subject to a test optotype having a predetermined visual acuity value presented to the subject's eye. For example, the answer detection step may detect whether the answer is correct based on one answer of the subject to a test optotype having the same visual acuity value. Also, for example, the answer detection step may detect whether the answer is correct based on multiple answers of the subject to a test optotype having the same visual acuity value. In other words, the answer detection step may detect whether the answer of the subject is correct based on one answer or multiple answers.

[0021] In addition, when detecting correct answers based on multiple answers in the answer detection step, the optotype presenting means may be controlled so that test optotypes with the same visual acuity value and different directions are presented a preset number of times. In this case, the answer detection step does not necessarily need to obtain all the multiple answers, and may proceed to the next process when a predetermined number of correct answers (or incorrect answers) are detected.

[0022] <Uncorrected correction confirmation step> The second acquisition step may include an uncorrected confirmation step of confirming whether the test eye is in an uncorrected state based on the correctness of the answer detected in the answer detection step. For example, the second acquisition step may acquire the final spherical power of the test eye based on the confirmation result in the uncorrected confirmation step. The uncorrected state of the test eye is a state in which the spherical power for correcting the test eye is insufficient. For example, if the test eye is myopic, it represents a myopic state despite the addition of a predetermined spherical power to the test eye. In other words, it is a state in which the focus is formed in front of the retina of the test eye. For example, if the test eye is hyperopic, it represents a hyperopic state despite the addition of a predetermined spherical power to the test eye. In other words, it is a state in which the focus is formed behind the retina of the test eye. Since only a rough spherical power can be obtained in the first acquisition step, there are cases in which the correction state of the test eye is inappropriate. However, by including an uncorrected confirmation step in the second acquisition step, the possibility that the correction state of the test eye is in an uncorrected state is reduced, and a measurement result with high accuracy can be obtained.

[0023] The uncorrected confirmation step may include a first spherical power adding step. The first spherical power adding step is a step of presenting a test optotype having a predetermined visual acuity value (e.g., 0.7 to 2.0, etc.) to the subject, and adding a first spherical power stronger than the current correction power for correcting the subject's eye when the answer is detected as incorrect. That is, it is a step of making the absolute value of the spherical power added to the subject's eye a value larger than the current value. If a negative power is added to the subject's eye, a larger spherical power is added to the negative side, and if a positive power is added to the subject's eye, a larger spherical power is added to the positive side. For example, the incorrect answer of the subject may include a case where the direction of the test optotype selected by the subject is different from the direction of the test optotype presented to the subject's eye, resulting in an incorrect answer, and a case where the subject cannot visually recognize the test optotype, resulting in no answer (not sure).

[0024] In the uncorrected condition confirmation step, a stronger spherical power may be added as the first spherical power. In detail, if the eye to be examined is myopic, -0.25D may be added as the first spherical power. If the eye to be examined is hyperopic, +0.25D may be added as the first spherical power. Of course, one or more levels of spherical power may be added. The level of the first spherical power may be preset or may be arbitrarily selected by the examiner.

[0025] The uncorrected confirmation step may include an uncorrected confirmation end step. The uncorrected confirmation end step is a step of presenting a test optotype having a predetermined visual acuity value to the subject, and ending the uncorrected confirmation step when the answer is detected as an incorrect answer in a state where the subject's eye is corrected with a first spherical power. In other words, the uncorrected confirmation end step is a step of presenting a test optotype having the same visual acuity value as that in the first spherical power adding step to the subject, and ending the uncorrected confirmation step when the answer is detected as an incorrect answer in a state where the subject's eye is corrected with a first spherical power. Note that the detection of an incorrect answer by the subject in the uncorrected confirmation end step indicates that the subject's eye is not in an uncorrected state.

[0026] In the uncorrected confirmation end step, if the answer of the examinee is detected as a correct answer, the uncorrected confirmation step may not be ended and may proceed to the next process. For example, at least one of the optotype presenting means or the correction means may be controlled to change at least one of the visual acuity value or the spherical power of the test optotype. For example, such control may be repeated until the answer of the examinee is an incorrect answer, thereby ending the uncorrected confirmation step. Note that detection of the correct answer of the examinee in the uncorrected confirmation end step indicates that the examinee's eye is in an uncorrected state.

[0027] <Overcorrection Check Step> The second acquisition step may include an overcorrection confirmation step of confirming whether the subject's eye is in an overcorrected state based on the correctness of the answer detected in the answer detection step. For example, the second acquisition step may acquire the final spherical power of the subject's eye based on the confirmation result in the uncorrected confirmation step and the confirmation result in the overcorrection confirmation step. The overcorrection state of the subject's eye is a state in which the spherical power correcting the subject's eye is excessive. For example, if the subject's eye is myopic, adding a predetermined spherical power to the subject's eye represents a state in which the subject's eye has become hyperopic. In other words, it is a state in which the focus is formed behind the retina of the subject's eye. For example, if the subject's eye is hyperopic, adding a predetermined spherical power to the subject's eye represents a state in which the subject's eye has become myopic. In other words, it is a state in which the focus is formed in front of the retina of the subject's eye. Since only a rough spherical power can be obtained in the first acquisition step, the correction state of the test eye may be inappropriate. However, by including an overcorrection confirmation step in the second acquisition step, the possibility that the correction state of the test eye is an uncorrected state as well as an overcorrected state are reduced, thereby enabling accurate measurement results to be obtained.

[0028] The overcorrection confirmation step may include a second spherical power adding step. The second spherical power adding step is a step of presenting a test target having a predetermined visual acuity value to the subject, and adding a second spherical power weaker than the current correction power for correcting the subject's eye when the answer is detected as an incorrect answer. That is, it is a step of making the absolute value of the spherical power added to the subject's eye smaller than the current value. If a negative power is added to the subject's eye, a smaller spherical power is added to the negative side, and if a positive power is added to the subject's eye, a smaller spherical power is added to the positive side. For example, the incorrect answer of the subject may include a case of an incorrect answer and a case of no answer.

[0029] In the overcorrection confirmation step, a stronger spherical power may be added as the second spherical power. In detail, if the eye to be examined is myopic, +0.25D may be added as the second spherical power. If the eye to be examined is hyperopic, -0.25D may be added as the second spherical power. Of course, one or more levels of spherical power may be added. The level of the second spherical power may be preset or may be arbitrarily selected by the examiner.

[0030] The overcorrection confirmation step may include an overcorrection confirmation end step. The overcorrection confirmation end step is a step of presenting a test optotype having a predetermined visual acuity value to the subject, and ending the overcorrection confirmation step when the answer is detected as an incorrect answer in a state where the subject's eye is corrected with a second spherical power. In other words, the overcorrection confirmation end step is a step of presenting a test optotype having the same visual acuity value as that in the second spherical power addition step to the subject, and ending the overcorrection confirmation step when the answer is detected as an incorrect answer in a state where the subject's eye is corrected with a second spherical power. Note that the detection of an incorrect answer by the subject in the overcorrection confirmation end step indicates that the subject's eye is not in an overcorrected state.

[0031] In the overcorrection confirmation end step, if the answer of the subject is detected as a correct answer, the overcorrection confirmation step may not be ended, and the process may proceed to the next step. For example, at least one of the optotype presenting means or the correction means may be controlled to change at least one of the visual acuity value or the spherical power of the test optotype. For example, such control may be repeated until the answer of the subject is an incorrect answer, thereby ending the overcorrection confirmation step. In addition, if the answer of the subject is detected as a correct answer, the second spherical power for correcting the subject may be regarded as an allowable range for the final spherical power, and the overcorrection confirmation step may be ended. Note that the detection of the correct answer of the subject in the overcorrection confirmation end step indicates that the subject's eye is in an overcorrected state.

[0032] In this embodiment, the uncorrected confirmation step and the overcorrected confirmation step included in the second acquisition step may be executed first, or may be executed first. For example, regardless of the eye to be examined (myopic or hyperopic), the uncorrected confirmation step may be executed first, and the overcorrected confirmation step may be executed later. Of course, regardless of the eye to be examined, the overcorrected confirmation step may be executed first, and the uncorrected confirmation step may be executed later. That is, the procedure of the second acquisition step may be changed according to the eye to be examined, and the final spherical power may be acquired. More specifically, the order of the first spherical power addition step and the second spherical power addition step may be changed, and the final spherical power may be acquired.

[0033] Also, for example, if the subject's eye is myopic, the uncorrected confirmation step may be performed first, and if the subject's eye is hyperopic, the overcorrected confirmation step may be performed first. Of course, if the subject's eye is myopic, the overcorrected confirmation step may be performed first, and if the subject's eye is hyperopic, the uncorrected confirmation step may be performed first. That is, the final spherical power may be obtained without changing the procedure of the second acquisition step according to the subject's eye. More specifically, the final spherical power may be obtained without changing the order of the first spherical power addition step and the second spherical power addition step.

[0034] <Example> An example of a subjective optometry device according to the present embodiment will be described below. In this example, the left-right direction of the optometry device is represented as the X direction, the up-down direction as the Y direction, and the front-rear direction as the Z direction.

[0035] Fig. 1 is an external view of a subjective optometry device 100. Fig. 1(a) shows a state in which an eye refraction measurement unit 40 is supported in a standby position. Fig. 1(b) shows a state in which the eye refraction measurement unit 40 is supported in a 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 subject controller 20, an eye refraction measurement unit 40, and the like.

[0036] The housing 1 has a light projection optical system 30 inside. The presentation window 2 transmits the visual target light beam from the light projection optical system 30. The visual target light beam is projected onto the subject's eye E through the presentation window 2. When an eye refractive power measuring unit 40 is disposed between the subject's eye E and the presentation window 2 (see FIG. 1(b)), the visual target light beam is projected onto the subject's eye E through the presentation window 2 and a test window 43 described below. This presents a test visual target to the subject's eye E. The speaker 3 outputs audio guidance and the like.

[0037] The holding unit 4 holds the eye refraction measuring unit 40. For example, the holding unit 4 moves an arm by driving a driving unit (motor or the like) not shown, thereby moving the eye refraction measuring unit 40 connected to the arm. This allows the eye refraction measuring unit 40 to be switched between a standby position and a measurement position.

[0038] The examiner's controller 10 is used by the examiner to operate the subjective optometry device 100. The examiner's controller 10 includes a switch section 11, a monitor 12, and the like. The switch section 11 inputs signals for performing various settings (e.g., moving the eye refractive power measuring unit 40, etc.). The monitor 12 displays various information (e.g., measurement results of the examinee's eye E, etc.). The monitor 12 may function as a touch panel that also serves as the switch section 11. Signals from the examiner's controller 10 are output to the control section 60 by wired communication or wireless communication.

[0039] The subject controller 20 is used to input the subject's answer. The subject controller 20 includes an answer lever 21, an answer button 22, and the like. The answer lever 21 is used when the subject inputs a direction relative to the test target. For example, signals in four directions, up, down, left, and right, corresponding to the directions of the gaps in the rings of the Landolt ring target, can be input by tilting the lever. The answer button 22 is used when the subject does not select a direction relative to the test target. The signal from the subject controller 8 is output to the control unit 60 by wired or wireless communication.

[0040] <Projection optical system> Fig. 2 is a schematic diagram of the light projection optical system 30. Fig. 2(a) shows the optical arrangement during a distance test. Fig. 2(b) shows the optical arrangement during a near test. The light projection optical system 30 projects a visual target light beam toward the subject's eye E. For example, the light projection optical system 30 includes a display 31, a plane mirror 32, a concave mirror 33, a near / far switcher 34, and the like.

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

[0042] The plane mirror 32 reflects the visual target light beam from the display 31 and guides it to the concave mirror 33. The plane mirror 32 also reflects the visual target light beam from the display 31 and guides it to the subject's eye E. For example, the plane mirror 32 is disposed so that the distance (presentation distance) from the subject's eye E to the display 31 during a near vision test of the subject's eye E is optically 40 cm. Note that instead of the plane mirror 32, it is also possible to use a reflecting member such as a prism, a beam splitter, or a half mirror.

[0043] The concave mirror 33 reflects the visual target light beam from the display 31 and guides it to the plane mirror 32. For example, the concave mirror 33 is disposed so that the distance (presentation distance) from the subject's eye E to the display 31 during a distance test of the subject's eye E is optically 5 m. Note that instead of the concave mirror 33, it is also possible to use a reflective member such as an aspheric mirror or a free-form mirror. Also, instead of the concave mirror 33, it is also possible to use a lens or the like.

[0044] The far / near switching unit 34 switches the arrangement of the display 31 between a distance test and a near test of the subject's eye E. For example, the far / near switching unit 34 moves the holding unit by driving a drive unit (motor or the like) not shown, thereby moving the display 31 held by the holding unit. This allows the display 31 to be switched between a distance arrangement and a near arrangement.

[0045] For example, during a distance test of the subject's eye E, the display screen of the display 31 is directed toward the back of the housing 1 (see FIG. 2(a)). The visual target light beam from the display 31 passes through the optical axis L1 and enters the plane mirror 32, where it is reflected in the direction of the optical axis L2. It also passes through the optical axis L2 and enters the concave mirror 33, where it is reflected in the direction of the optical axis L3. It also passes through the optical axis L3 and enters the plane mirror 32, where it is reflected in the direction of the optical axis L4. As a result, the visual target light beam that has passed through each optical member inside the housing 1 and is emitted to the outside of the housing 1 is projected onto the subject's eye E.

[0046] For example, during a near vision test of the subject's eye E, the display screen of the display 31 is directed toward the upper surface of the housing 1 (see FIG. 2(b)). The visual target light beam from the display 31 passes through the optical axis L3 and enters the plane mirror 32, and is reflected by the plane mirror 32 in the direction of the optical axis L4. As a result, the visual target light beam that has passed through each optical member inside the housing 1 and is emitted to the outside of the housing 1 is projected onto the subject's eye E.

[0047] <Eye refractive power measurement unit (corrective optical system)> 3 is a schematic diagram of the eye refraction measuring unit 40. The eye refraction measuring unit 40 subjectively measures the refractive power of the subject's eye E. The eye refraction measuring unit 40 is also used as a correction optical system. The correction optical system is disposed in the optical path of the projection optical system 30, and changes the optical characteristics of the visual target light beam. For example, the eye refraction measuring unit 40 includes a forehead rest 41, a lens unit 42, an examination window 43, a moving unit 44, and the like.

[0048] The forehead rest 41, against which the subject's head rests, fixes the subject's eye E at a predetermined examination position and maintains a constant distance from the subject's 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 (a left examination window 43L and a right examination window 43R).

[0049] 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 driving unit 45 (left driving unit 45L and right driving 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 driving unit 46. For a detailed configuration of the moving unit 44, please refer to, for example, Japanese Patent Application Laid-Open No. 2004-329345.

[0050] The lens unit 42 includes a lens disk 50 therein. The lens disk 50 has a pair of left and right lens disks, a left lens disk 50L and a right lens disk 50R. The lens disk 50 is rotated by driving a drive unit 51 (left drive unit 51L and right drive unit 51R). The lens disk 50 also has an opening (or a 0D lens) and a plurality of optical elements 52 (left optical element 52L and right optical element 52R) arranged on the same circumference. These optical elements are rotated by driving a drive unit 53 (left drive unit 53L and right drive unit 53R). As a result, the desired optical element 52 is switched and positioned in the inspection window 43 at the desired angle.

[0051] The lens disk 50 is composed of one lens disk or multiple lens disks. For example, a spherical lens disk, a cylindrical lens disk, an auxiliary lens disk, etc. may be provided. As an example, the spherical lens disk may have multiple spherical lenses with different spherical powers (spherical refractive powers). Also, as an example, the cylindrical lens disk may have multiple cylindrical lenses with different cylindrical powers (cylindrical refractive powers). Also, as an example, the auxiliary lens disk 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, a positioning lens, etc. The driving unit 51 and the driving unit 53 may be provided for each lens disk.

[0052] The eye refractive power measuring unit 40 may be configured to change the optical characteristics of the visual target light beam. For example, as in this embodiment, the eye refractive power measuring unit 40 may be configured to control an optical element. Also, for example, the eye refractive power measuring unit 40 may be configured to control a wavefront modulation element.

[0053] <Control Unit> FIG. 4 is a schematic diagram of a control system of the subjective optometry device 100. For example, the control unit 60 includes a CPU (processor), a RAM, a ROM, etc. The CPU controls the driving of each unit in the subjective optometry device 100. Various information is temporarily stored in the RAM. Various programs executed by the CPU are stored in the ROM. As an example, a program for realizing an application (self-optometry application) that automatically progresses the optometry based on answers input by the subject is stored. The control unit 60 may be composed of multiple control units (i.e., multiple processors).

[0054] The control unit 60 is connected to the speaker 3, the display 31, the examiner's controller 10, the subject's controller 20, a non-volatile memory 70 (hereinafter, memory 70), etc. Also connected to the control unit 60 are a drive unit for the holding unit 4, a drive unit for the near / far switching unit 34, a drive unit for the eye refractive power measuring unit 40 (drive units 45, 46, 51, 53), etc.

[0055] The memory 70 is a non-transient storage medium that can retain stored contents even if the power supply is cut off. For example, the memory 70 may be a hard disk drive, a flash ROM, a USB memory, or the like.

[0056] <Control action> The control operation of the subjective optometry apparatus 100 will be described.

[0057] For example, in a self-eye examination, an objective test and a subjective test are performed in sequence on the subject's left eye. The objective test provides an objective value for the left eye. The subjective test provides a subjective value for the left eye. After each test on the subject's left eye is completed, each test on the subject's right eye is performed in the same manner, and the objective and subjective values ​​for the right eye are obtained.

[0058] In this embodiment, the subjective test of the left eye will be described in detail. For example, the subjective test is composed of a first step and a second step. In the first step, the left eye is subjectively measured to obtain a correction power for correcting the left eye. For example, a rough spherical power is obtained by a red-green test on the left eye. In addition, a final cylinder power and a final astigmatism axis angle are obtained by a cross cylinder test on the left eye. In the second step, the left eye is subjectively measured to obtain a final spherical power that is a fine adjustment of the rough spherical power for correcting the left eye. The first and second steps are automatically progressed by the execution of a self-eye examination application.

[0059] Below, the first and second steps will be described in order, taking as an example a case where the left eye is myopic.

[0060] <First step> 5 shows an example of the flow of step 1. For example, step 1 includes a plurality of inspection items, and proceeds in the order of red-green inspection P1-1, cross cylinder inspection P1-2, cross cylinder inspection P1-3, and red-green inspection P1-4.

[0061] <Red-green inspection (P1-1)> In the red-green test P1-1, the spherical power based on the objective value of the left eye is adjusted to a rough spherical power. For example, in a state where the left eye is corrected with a predetermined spherical power based on the objective value, the subject's answer to visually recognize a red-green optotype is used to determine whether the left eye is in a myopic, emmetropic, or hyperopic state.

[0062] The control unit 60 displays a red-green optotype on the display 31, with the red optotype placed on the left side and the green optotype placed on the right side. The control unit 60 also places a spherical lens in the left test window 43L. The control unit 60 also generates a voice guide from the speaker 3, asking the examiner which color optotype the examiner can clearly see. As an example, the control unit 60 generates a voice guide to tilt the answer lever 21 to the left if the examiner can clearly see the red optotype, tilt the answer lever 21 to the right if the examiner can clearly see the green optotype, and press the answer button 22 if the two are about the same.

[0063] When the control unit 60 receives a leftward input signal from the answer lever 21, it determines that the left eye is myopic, and when it receives a rightward input signal, it determines that the left eye is hyperopic. When it receives an input signal from the answer button 22, it determines that the left eye is emmetropic. When the left eye is hyperopic, it is overcorrected, and the spherical power is weakened until it becomes emmetropic (or myopic).

[0064] <Cross cylinder inspection (P1-2)> In the cross cylinder test P1-2, the astigmatism axis angle based on the objective value of the left eye is adjusted to the final astigmatism axis angle. For example, in a state where the left eye is corrected at a predetermined astigmatism axis angle based on the objective value, it is determined whether the astigmatism axis angle of the left eye coincides with the astigmatism axis angle for correcting the left eye, based on the subject's response to visually recognizing the point cloud optotype.

[0065] The control unit 60 displays one point cloud target on the display 31. The control unit 60 also rotates the autocross cylinder lens arranged in the left test window 43L so that the axis angle is set to adjust the astigmatism axis angle. The control unit 60 also generates a voice guide from the speaker 3, asking which of the two point cloud targets separated in the field of view of the left eye is clearly visible. As an example, a voice guide is generated to tilt the answer lever 21 in the direction of the point cloud target that is clearly visible, and to press the answer button 22 if the two are the same.

[0066] When the control unit 60 receives an input signal from the answer lever 21, it determines that the astigmatism axis angle of the left eye does not match the astigmatism axis angle for correcting the left eye. When the control unit 60 receives an input signal from the answer button 22, it determines that the astigmatism axis angle of the left eye matches the astigmatism axis angle for correcting the left eye. The control unit 60 repeats changing the astigmatism axis angle until the astigmatism axis angles match. This allows the final astigmatism axis angle for properly correcting the left eye to be obtained.

[0067] <Cross cylinder inspection (P1-3)> In the cross cylinder test P1-3, the cylinder power based on the objective value of the left eye is adjusted to the final cylinder power. For example, in a state where the left eye is corrected with a predetermined cylinder power based on the objective value, the suitability of the cylinder power is judged based on the examinee's answer when viewing the point cloud optotype. The control unit 60 rotates the auto cross cylinder lens arranged in the left test window 43L to an axial angle for adjusting the cylinder power, and generates a voice guide from the speaker 3 that shows how to operate the answer lever 21 and the answer button 22. For example, the voice guide in the cross cylinder test P1-3 may be the same as the voice guide in the cross cylinder test P1-2.

[0068] When the control unit 60 receives an input signal from the answer lever 21, it determines that the cylindrical power for correcting the left eye is not appropriate. When the control unit 60 receives an input signal from the answer button 22, it determines that the cylindrical power for correcting the left eye is appropriate. The control unit 60 repeats changing the cylindrical power until the cylindrical power becomes appropriate. In this way, the cylindrical power for appropriately correcting the left eye is obtained.

[0069] <Red-green inspection (P1-4)> In the red-green test P1-4, the rough spherical power adjusted in the red-green test P1-1 is further adjusted as necessary. For example, if accommodation is working in the left eye, the rough spherical power is further adjusted. For example, in a state where the left eye is corrected with the rough spherical power based on the red-green test P1-4, it is determined whether accommodation is working in the left eye based on the subject's answer when viewing the red-green optotype.

[0070] The red-green test P1-4 is the same as the red-green test P1-1, so the explanation will be omitted. When the left eye is in a hyperopic state, accommodation is considered to be working, and the spherical power is weakened until the left eye is in a normal (or myopic) state. This allows a rough spherical power for correcting the left eye to be obtained.

[0071] In the first step, the rough spherical power, the final cylindrical power, and the final cylindrical axis angle are obtained by performing each test item on the left eye in this way. This determines the corrective power of the left eye at the start of the second step (hereinafter, the initial power).

[0072] <Second step> In the first step, the spherical power of the subject's eye is roughly adjusted to obtain a rough spherical power, which may result in an inappropriate correction state of the subject's eye. In particular, in the above-mentioned red-green test, a red-green optotype having a small visual acuity value (for example, a visual acuity value equivalent to 0.3 to 0.5) may be used, which is likely to cause such a problem. The smaller the visual acuity value, the larger the display size, and the larger the visual acuity value, the smaller the display size. Even if the spherical power for correcting the left eye is inappropriate, the subject can view each optotype because the display sizes of the red and green optotypes are large. For example, even if the spherical power of the left eye is insufficient (i.e., the left eye is in an uncorrected state) and the left eye is in a myopic state, the subject can view each optotype in a blurred state.

[0073] In the red-green test, it is expected that the left eye will be judged to be in a state of emmetropia when the subject sees each optotype clearly and judges that they have the same level of vision. However, in the above case, the subject may judge that the left eye has emmetropia even though it is in a state of myopia because the subject judges that the optotypes have the same level of vision when they are blurred. This may result in the test proceeding with the left eye uncorrected, making it difficult to obtain accurate test results. For this reason, in the second step performed after the first step, the rough spherical power for correcting the left eye is fine-tuned to obtain the final spherical power for properly correcting the left eye.

[0074] Fig. 6 shows an example of the flow of the second step. The second step includes an uncorrected state confirmation step P3 for confirming whether the spherical power of the left eye is insufficient or not, and an overcorrected state confirmation step P4 for confirming whether the spherical power of the left eye is excessive or not.

[0075] The control unit 60 arranges a spherical lens, a cylindrical lens, a cross cylinder lens, etc. in the left test window 43L so as to correct the left eye with the initial power (step P2-1). Here, for convenience, the initial power based on the rough spherical power of the left eye is set to a spherical power of 0D (initial spherical power of 0D), a cylindrical power of 0D, and an astigmatism axis angle of 0°. The control unit 60 also displays a Landolt ring having a predetermined visual acuity value on the display 31 as the initial target (step P2-2). As an example, a Landolt ring having a visual acuity value of 0.7 is displayed as the initial target. The control unit 60 also generates a voice guide from the speaker 3 asking about the direction of the gap in the ring of the Landolt ring. As an example, a voice guide is generated to tilt the answer lever 21 according to the direction of the gap in the ring of the Landolt ring, and to press the answer button 22 if the direction of the gap is unknown.

[0076] When the control unit 60 receives an input signal from the answer lever 21, it detects whether the answer by the subject is correct or incorrect (step P2-3). If the answer is correct, it proceeds to a step for changing the visual acuity value of the Landolt ring presented to the left eye. If the answer is incorrect, it proceeds to uncorrected confirmation step P3 for checking whether the left eye is in an uncorrected state. Note that when an input signal is received from the answer button 22, a no-answer (don't know) answer by the subject is regarded as an incorrect answer, and it proceeds to uncorrected confirmation step P3.

[0077] First, a case where the step proceeds from step P2-3 to a step of changing the visual acuity value of the Landolt ring will be described. If the subject's answer in step P2-3 is correct, the control unit 60 switches the visual acuity value of the Landolt ring presented to the left eye to a visual acuity value one step higher (step P2-4). That is, the visual acuity value of the Landolt ring is increased by one increment and switched to a value larger than the current value. As an example, the visual acuity value of the Landolt ring is switched to 0.8.

[0078] Next, the control unit 60 again generates a voice guide asking the subject about the direction of the gap in the ring of the Landolt ring and detects whether the answer by the subject is correct (step P2-5). If the answer is correct, it further detects whether the Landolt ring presented to the subject has the highest visual acuity value (for example, 2.0, etc.) (step P2-6). If the value is different from the highest visual acuity value, the process returns to step P2-4, and the visual acuity value of the Landolt ring is changed to a visual acuity value one step higher. As an example, the visual acuity value of the Landolt ring is changed to 0.9. For example, the control unit 60 controls the display on the display 31 so that the visual acuity value is increased by one step until it reaches the highest visual acuity value every time the answer of the subject is detected as correct in step P2-5. If the answer in step P2-5 is incorrect, the process proceeds to uncorrected confirmation step P3. If the answer is detected as the highest visual acuity value in step P2-6, the process proceeds to overcorrected confirmation step P4.

[0079] Next, a case will be described where the procedure proceeds from step P2-3 to step P3 for confirming whether the left eye is in an uncorrected state. If the subject's answer in step P2-3 is incorrect, the control unit 60 switches the spherical power for correcting the left eye at present to a spherical power that is one step stronger (step P3-1). As an example, the spherical power for the left eye is switched to -0.25D, one step stronger than the initial spherical power 0D.

[0080] Next, the control unit 60 again generates a voice guide asking the subject about the direction of the gap in the ring of the Landolt ring and detects whether the answer by the subject is correct or not (step P3-2). For example, if the state in which the initial spherical power is added to the left eye is an uncorrected state, the uncorrected state of the left eye is improved by adding a spherical power stronger than the initial spherical power to the left eye.

[0081] If the answer in step P3-2 is correct, the control unit 60 further detects whether the Landolt ring presented to the subject is the highest visual acuity value (step P2-7). If the value is different from the highest visual acuity value, it is assumed that the left eye is in an uncorrected state, and the process proceeds to step P2-4. That is, the state in which the left eye is corrected with one step stronger spherical power is maintained, and the visual acuity value of the Landolt ring is changed to a visual acuity value one step higher. Thereafter, each time the answer is detected as correct in step P2-5, the visual acuity value is changed one step higher until it reaches the highest visual acuity value, while keeping the one step stronger spherical power. Also, if the answer in step P3-2 is incorrect, the control unit 60 assumes that the left eye is not in an uncorrected state, and ends the uncorrected confirmation step P3. Also, if the control unit 60 detects the highest visual acuity value in step P2-7, it ends the uncorrected confirmation step P3.

[0082] In addition, if the process proceeds from step P2-5 to step P3 for checking uncorrected teeth, the process is basically the same and will be omitted.

[0083] After the uncorrected confirmation step P3 is completed, the process proceeds to an overcorrection confirmation step P4 to confirm whether the left eye is in an overcorrected state. If the answer in step P3-2 is incorrect, the control unit 60 switches the spherical power currently correcting the left eye to a spherical power two steps weaker (step P4-1). As an example, since the left eye is corrected to -0.25D, which is one step stronger than the initial spherical power of 0D, the spherical power is switched to +0.25D, which is two steps weaker than -0.25D. In other words, the spherical power of the left eye is switched to +0.25D, which is one step weaker than the initial spherical power of 0D.

[0084] Next, the control unit 60 again generates a voice guide asking the subject about the direction of the gap in the ring of the Landolt ring and detects whether the answer by the subject is correct or not (step P4-2). For example, if the state in which the initial spherical power was added to the left eye was an overcorrection state, the overcorrection state of the left eye is improved by adding a spherical power weaker than the initial spherical power to the left eye.

[0085] If the answer in step P4-2 is correct, the control unit 60 determines that the left eye was overcorrected and proceeds to step P4-1. For example, the left eye is corrected with a spherical power that is one step weaker. Thereafter, every time the answer is detected as correct in step P4-2, the spherical power is changed to one step weaker. If the answer by the subject is incorrect, the control unit 60 determines that the left eye was not overcorrected and ends the overcorrection confirmation step P4.

[0086] In addition, when proceeding from step P2-6 and step P2-7 to overcorrection confirmation step P4, the procedure is basically the same and will be omitted.

[0087] In the second step, the rough spherical power for the left eye is finely adjusted in this way to obtain the final spherical power for the left eye (step P2-8). For example, the spherical power corrected when the answer was last detected as correct in step P4-2 is obtained as the final spherical power.

[0088] The control unit 60 can obtain the best visual acuity value and the fully corrected value of the left eye by completing the second step for the left eye. For example, the visual acuity value of the Landolt ring presented to the left eye in step P4-2 is acquired as the best visual acuity value. Also, for example, the final correction power (i.e., the final spherical power, the final cylindrical power, and the final astigmatism axis angle) including the final spherical power obtained in step P2-6 is acquired as the fully corrected value, which is the weakest correction power that provides the best visual acuity of the left eye. The control unit 60 stores the best visual acuity value and the fully corrected value of the left eye in the memory 70, and ends the subjective test.

[0089] As described above, for example, the eye examination control program in this embodiment includes a self-eye examination program that automatically progresses the eye examination based on the answer entered by the subject after visually viewing the test optotype, and includes a first acquisition step of acquiring a rough spherical power obtained by subjectively measuring the eye to be examined, and a second acquisition step that is executed after the first acquisition step of acquiring a final spherical power obtained by fine-adjusting the rough spherical power, in which the second acquisition step acquires the final spherical power by controlling at least one of the optotype presenting means and the correction means and executing a progression procedure for fine-adjusting the rough spherical power. The second acquisition step includes an examination start step of setting an initial power for correcting the eye to be examined by controlling the correction means based on the rough spherical power, starting a procedure to carry out an examination in a state in which the eye to be examined is corrected with the initial power, an answer detection step of detecting whether the answer of the examinee during the procedure is correct, and an uncorrected confirmation step of confirming whether the eye to be examined is in an uncorrected state or not based on the correctness of the answer detected in the answer detection step, and acquiring a final spherical power based on the confirmation result in the uncorrected confirmation step. By providing the eye examination control program with such a configuration, even in a self-eye examination in which an examiner is not present, the possibility that the correction state of the eye to be examined is in an uncorrected state is reduced, and a measurement result with high accuracy can be obtained.

[0090] Also, for example, in the eye examination control program in this embodiment, the uncorrected confirmation step is configured to include a first spherical power adding step of presenting a test optotype having a predetermined visual acuity value to the subject, and adding a first spherical power stronger than the current correction power for correcting the subject's eye when the answer is detected as incorrect, and an uncorrected confirmation ending step of presenting a test optotype having the predetermined visual acuity value to the subject, and ending the uncorrected confirmation step when the answer is detected as incorrect in a state in which the subject's eye is corrected with the first spherical power. This allows the subject's eye to be checked at an appropriate time for whether it is in an uncorrected state, allowing the examination to be carried out efficiently, and allowing the correction state of the subject's eye to be easily adjusted to a suitable state.

[0091] Also, for example, in the eye examination control program in this embodiment, the second acquisition step is configured to include an overcorrection confirmation step of confirming whether the subject's eye is in an overcorrected state or not based on the correctness of the answer detected in the answer detection step. This reduces the possibility that the subject's eye is in an uncorrected state and an overcorrected state even in a self-eye examination without an examiner present, and allows for accurate measurement results to be obtained.

[0092] Also, for example, in the eye examination control program in this embodiment, the overcorrection confirmation step is configured to include a second spherical power adding step of presenting a test optotype having a predetermined visual acuity value to the subject, and adding a second spherical power weaker than the current correction power for correcting the subject's eye when the answer is detected as incorrect, and an overcorrection confirmation ending step of presenting a test optotype having a predetermined visual acuity value to the subject, and ending the overcorrection confirmation step when the answer is detected as incorrect in a state in which the subject's eye is corrected with the second spherical power. This allows the subject's eye to be checked for overcorrection at an appropriate time, allowing the examination to be carried out efficiently, and the correction state of the subject's eye to be easily adjusted to a suitable state.

[0093] Also, for example, in the eye examination control program in this embodiment, the visual acuity value of the test optotype presented to the subject's eye in the first acquisition step is configured to be smaller than the visual acuity value of the test optotype presented to the subject's eye in the second acquisition step. In this case, it is particularly difficult to notice the uncorrected state of the subject's eye, but the correction state can be appropriately changed by proceeding with the examination via the uncorrected confirmation step.

[0094] <Example of transformation> In this embodiment, in the flowchart of FIG. 6, the spherical power for correcting the left eye is changed in one step (or two steps) in step P3-1 and step P4-1 based on the correctness of the answer of the examinee, but the present invention is not limited to this. Of course, the spherical power may be changed in a step other than one step. In addition, the spherical power may be changed in any step by the examiner, or may be changed in a step that is set in advance based on an experiment or simulation.

[0095] In this embodiment, in the flowchart of Fig. 6, the highest visual acuity value that can be presented by the subjective optometry device is set as the default highest visual acuity value in steps P2-6 and P2-7, but the present invention is not limited to this. For example, the highest visual acuity value of such a test target may be arbitrarily determined by the examiner. In other words, any value included in the visual acuity value that can be presented by the subjective optometry device may be set as the highest visual acuity value.

[0096] In this embodiment, in the flowchart of FIG. 6, when the answer in step P4-2 is correct, the spherical power for correcting the left eye is weakened, and the control for adjusting the spherical power is repeated until the answer is correct, but the present invention is not limited to this. For example, when the answer in step P4-2 is correct, the spherical power for correcting the eye to be examined at present may be set as the allowable range of the final spherical power, and the system may proceed to step P2-8. That is, regardless of whether the answer in step P4-2 is correct or not, the system may proceed to step P2-8, but whether the spherical power corrected at the previous time point for the left eye is set as the final spherical power or the spherical power for correcting the left eye at present is set as the final spherical power may be changed depending on the answer.

[0097] In this embodiment, the first and second steps are described using the example in which the left eye is myopic, but the present invention is not limited to this. For example, the first and second steps can be performed in the same manner even if the left eye is hyperopic.

[0098] For example, the flowchart of the second step shown in FIG. 6 can be applied even if the left eye is farsighted. However, since the uncorrected state and the overcorrected state have an inverse relationship between myopic and hyperopic eyes, the uncorrected confirmation step P3 can be considered as an overcorrected confirmation step, and the overcorrected confirmation step P4 can be considered as an uncorrected confirmation step. That is, when the answer is detected to be incorrect in step P2-3 or step P2-5, the control unit 60 switches the spherical power for correcting the left eye to -0.25D, which is one step weaker, in step P3-1, and if the answer in step P3-2 is incorrect, the control unit 60 ends the overcorrected confirmation step and proceeds to the uncorrected confirmation step. Also, when the answer is detected to be incorrect in step P3-2, the control unit 60 switches the spherical power for correcting the left eye to +0.25D, which is two steps stronger, in step P4-1, and if the answer in step P4-2 is incorrect, the control unit 60 ends the uncorrected confirmation step.

[0099] Of course, for a hyperopic eye, the overcorrection confirmation step may be performed after the undercorrection confirmation step, as in the case of a myopic eye. In this case, at least a part of a flowchart may be different for a myopic eye and a hyperopic eye. The control unit 60 may detect whether the eye is myopic or hyperopic, and perform control based on the corresponding flowchart based on the detection result.

[0100] In this embodiment, a Landolt ring having a predetermined visual acuity value is presented to the left eye, and the control based on the flow chart is performed based on the correctness or incorrectness of one answer of the subject who visually recognizes the Landolt ring. However, the present invention is not limited to this. For example, the control based on the flow chart may be performed based on the correctness or incorrectness of multiple answers of the subject. In this case, the direction of the gap of the ring of the Landolt ring having a predetermined visual acuity value may be changed.

[0101] As an example, the control unit 60 may present a Landolt ring having a predetermined visual acuity value to the left eye five times by changing the direction of the slits in the ring. At this time, the control unit 60 may detect the answer to the Landolt ring having the predetermined visual acuity value as a correct answer if the subject answers correctly three or more times out of the five times. Also, at this time, the control unit 60 may detect the answer to the Landolt ring having the predetermined visual acuity value as an incorrect answer if the subject answers incorrectly three or more times out of the five times.

[0102] For example, by configuring the eye examination control program in this way, it is possible to more accurately determine whether the correction state of the eye to be examined is appropriate. In this embodiment, such control may be executed at least in the uncorrected state confirmation step P3. Of course, it may also be executed in the overcorrected state confirmation step P4 or in the step of changing the visual acuity value of the Landolt ring. [Explanation of symbols]

[0103] 1 Case 2 Presentation window 3 Speakers 10 Examiner's controller 20 Subject Controller 30 Projection optical system 40 Eye Refractive Index Measuring Unit 43 Inspection window 60 Control section 100 Self-examination device

Claims

1. optotype presenting means for presenting a test optotype to the subject's eye; a correction means for changing an optical characteristic of a visual target light beam emitted from the visual target presenting means; having An optometry control program executed in a subjective optometry device that subjectively measures optical characteristics of the subject's eye, a self-eye examination program that automatically proceeds with the eye examination based on an answer entered by a subject after visually checking the test optotype, The self-eye examination program includes: a first acquisition step of acquiring a rough spherical power obtained by subjectively measuring the eye to be examined; A second acquisition step is executed after the first acquisition step, and is for acquiring a final spherical power obtained by finely adjusting the rough spherical power, the second acquisition step being for acquiring the final spherical power by controlling at least one of the optotype presenting means and the correction means and executing a progression procedure for acquiring the final spherical power; Including, The second acquisition step includes: an examination start step of setting an initial power for correcting the eye to be examined by controlling the correction means based on the rough spherical power, and starting the procedure to perform an examination in a state in which the eye to be examined is corrected with the initial power; an answer detection step for detecting whether the answer of the subject is correct or incorrect while the procedure is being performed; an uncorrected state confirmation step for confirming whether or not the subject's eye is in an uncorrected state based on the correctness of the answer detected in the answer detection step; Including, The uncorrected confirmation step includes: a first spherical power adding step of presenting a test target having a predetermined visual acuity value to the subject, and adding a first spherical power stronger than a current correction power for correcting the subject's eye when the answer is detected as an incorrect answer; a test target having the predetermined visual acuity value is presented to the subject, and the answer is detected as an incorrect answer in a state where the subject's eye is corrected with the first spherical power, and an uncorrected confirmation terminating step is performed; Including, The optometry control program is characterized in that the final spherical power is obtained based on a confirmation result in the uncorrected confirmation step.

2. The optometry control program according to claim 1, The second acquisition step includes: an overcorrection confirmation step of confirming whether or not the subject's eye is in an overcorrected state based on the correctness of the answer detected in the answer detection step; The overcorrection confirmation step includes: a second spherical power adding step of presenting a test target having a predetermined visual acuity value to the subject, and adding a second spherical power weaker than a current correction power for correcting the subject's eye when the answer is detected as an incorrect answer; an overcorrection confirmation terminating step of presenting a test target having the predetermined visual acuity value to the subject, and terminating the overcorrection confirmation step when the answer is detected as an incorrect answer in a state in which the subject's eye is corrected with the second spherical power; Including, The optometry control program is characterized in that the final spherical power is obtained based on the confirmation result in the overcorrection confirmation step.

3. The optometry control program according to claim 1 or 2, the answer detection step detects whether the answer to the test optotype having the predetermined visual acuity value is correct or incorrect based on a plurality of answers; The eye examination control program is characterized in that the uncorrected confirmation ending step ends the uncorrected confirmation step when the correctness of the answer is detected to be an incorrect answer based on the multiple answers.

4. In the optometry control program according to any one of claims 1 to 3, An eye examination control program, characterized in that the visual acuity value of the test optotype presented to the test eye in the first acquisition step is smaller than the visual acuity value of the test optotype presented to the test eye in the second acquisition step.

Images