JP7263985B2 - Subjective optometric device - Google Patents

Description

The present disclosure relates to a subjective optometric apparatus that subjectively measures optical characteristics of an eye to be examined.

By placing an optical member (e.g., spherical lens, cylindrical lens, etc.) in front of the subject's eye and presenting a target to the subject's eye via the optical member, the optical characteristics of the subject's eye are subjectively measured. Subjective optometric devices are known.

JP-A-5-176893

In the subjective measurement, a binocular visual function test is performed on the subject's eye, and a visual target is presented to the left eye and the right eye to confirm the fusion state. At this time, it was difficult for the examiner to imagine how the examinee visually recognized the target with both eyes.

In view of the above-described conventional technology, the technical problem of the present disclosure is to provide a subjective optometry apparatus and a subjective optometric program that enable a subject to easily imagine how a visual target observed with both eyes looks.

In order to solve the above problems, the present invention is characterized by having the following configurations.

A subjective optometric apparatus according to a first aspect of the present disclosure includes a visual target presenting unit that presents visual targets to the left eye and the right eye of a subject, and subjectively recognizes the optical characteristics of the left eye and the right eye. and an anterior segment image acquiring means for acquiring an anterior segment image of the left eye and the right eye in a state in which the optotype is presented to the left eye and the right eye. eye position information acquisition means for acquiring eye position information of the left eye and the right eye based on the anterior segment image; and a first image showing how the visual target is viewed with the left eye. and a second image showing how the visual target is viewed with the right eye, wherein both eyes when the visual target is viewed with the left eye and the right eye and display control means for causing a display means to display a fusion image showing how it looks in the view, wherein the display control means controls the positional relationship between the first image and the second image based on the eye position information is displayed on the display means so that the state of fusion by the left eye and the right eye can be grasped.

A subjective optometry program according to a second aspect of the present disclosure includes a visual target presenting unit that presents visual targets to the left eye and the right eye of a subject, and subjectively recognizes the optical characteristics of the left eye and the right eye. A subjective optometry program used in a subjective optometric device that measures to the subjective optometric device, which is executed by a processor of the subjective optometric device to determine the an anterior segment image acquiring step of acquiring an anterior segment image of the left eye and the right eye; and an eye position information acquiring step of acquiring eye position information of the left eye and the right eye based on the anterior segment image and a fusion image including a first image showing how the target looks when viewed with the left eye, and a second image showing how the target looks when viewed with the right eye and causing the subjective optometry device to perform a display control step of displaying on a display means a fusion image showing how the visual target is viewed with the left eye and the right eye. , the display control step displays the fusion image in which the positional relationship between the first image and the second image is set based on the eye position information on the display means; It is characterized by making it possible to grasp the fusion state by.

1 is an external view of a subjective optometric apparatus; FIG. It is a figure which shows the measurement part of a subjective optometric apparatus. FIG. 2 is a schematic configuration diagram of the inside of the subjective optometry apparatus viewed from the front. FIG. 2 is a schematic configuration diagram of the inside of the subjective optometric apparatus as viewed from the side; FIG. 2 is a schematic configuration diagram of the inside of the subjective optometric apparatus viewed from above; It is a figure which shows the control system of a subjective optometric apparatus. It is an example of left-eye and right-eye reference images. It is an example of the anterior segment images of the left eye and the right eye. It is an example of a monitor display screen.

<Overview>
An outline of a subjective optometric apparatus according to an embodiment of the present disclosure will be described. The items classified in <> below can be used independently or in conjunction with each other. The symbols L and R indicate left eye and right eye, respectively.

The subjective optometric apparatus in this embodiment subjectively measures the optical characteristics of the subject's eye. The optical characteristics of the subject's eye include at least any of eye refractive power (spherical power, cylindrical power, astigmatism axis angle, etc.), contrast sensitivity, binocular vision function (for example, amount of oblique vision, stereoscopic vision function, etc.), and the like. can be measured.

<Optical target presenting means>
The subjective optometric apparatus includes a target presenting means. The optotype presenting means presents the optotypes to the left and right eyes of the subject. A display means (for example, the display 31) may be used as the optotype presenting means. For example, the display means may be a display, such as LCOS (Liquid crystal on silicon), LCD (Liquid Crystal Display), organic EL (Electro Luminescence), and the like.

In this embodiment, the optotype presenting means may present the optotypes to the left eye and the right eye of the subject at the same time. For example, the optotype presenting means may also serve as left eye optotype presenting means for presenting the optotype to the left eye and right eye optotype presenting means for presenting the optotype to the right eye. good too. In this case, the optotype presenting area for presenting the optotype in the optotype presenting means is divided into the optotype presenting region for presenting the optotype for the left eye and the optotype presenting region for presenting the optotype for the right eye. It may be divided into a region and provided. Further, for example, the optotype presenting means may include left-eye optotype presenting means and right-eye optotype presenting means, respectively. In this case, the optotype presenting means for the left eye and the optotype presenting means for the right eye may be provided as a pair on the left and right.

<Subjective measuring means>
The subjective optometric apparatus may include a subjective measurement optical system (for example, the subjective measurement optical system 25). The subjective measurement optical system may include a projection optical system (for example, projection optical system 30). The projection optical system projects a target light beam toward the eye to be examined. For example, the projection optical system may have the above-described optotype presenting means as an optotype presenting unit that presents the optotype to the subject's eye. In this case, the projection optical system may project the optotype light flux emitted from the optotype presenting means toward the eye to be examined. The subjective measurement optical system may also include a corrective optical system (for example, corrective optical system 60). The corrective optical system is arranged in the optical path of the projection optical system and changes the optical properties of the target light beam. In this case, the projection optical system may project the target light flux emitted from the target presenting means and corrected through the correction optical system toward the eye to be examined.

<Anterior Segment Image Acquisition Means>
The subjective optometric apparatus includes an anterior segment image acquiring means (for example, the control unit 70). The anterior segment image acquiring means acquires an anterior segment image of the subject's eye. In this embodiment, the anterior segment image acquiring means acquires the anterior segment images of the left eye and the right eye in a state in which the optotypes are presented to the left eye and the right eye. Note that the anterior segment image may be a single image including the anterior segment of the left eye and the anterior segment of the right eye. Also, the anterior segment image may be an image of each of the anterior segment of the left eye and the anterior segment of the right eye (that is, two images).

The anterior segment image acquiring means may acquire the anterior segment images of the left eye and the right eye in real time. For example, the anterior segment image acquisition means may continuously acquire the anterior segment images of the left eye and the right eye. Further, for example, the anterior segment image acquiring means may acquire the anterior segment images of the left eye and the right eye at predetermined time intervals (for example, at intervals of 5 seconds, etc.).

For example, the subjective optometric apparatus may include, in addition to the subjective optometric apparatus, devices for imaging the anterior segments of the left and right eyes of the subject. In this case, the anterior segment image acquiring means acquires the anterior segment images by receiving the anterior segment images captured by the device for imaging the anterior segments of the left and right eyes of the subject. may As an example, the device for imaging the anterior segment of the left eye and right eye of the subject may be a wearable device (eg, glasses-type wearable terminal, head-mounted display, etc.).

For example, the subjective optometric apparatus may include an anterior segment imaging means (for example, the observation optical system 50 and the imaging section 90). The anterior segment imaging means images the anterior segments of the subject's left and right eyes in a state in which the visual targets are presented to the subject's left and right eyes. In this case, the anterior segment image acquiring means may acquire the anterior segment image captured by the anterior segment imaging means.

<Eye Position Information Acquisition Means>
The subjective optometric apparatus includes eye position information acquisition means (for example, the control unit 70). The eye position information acquiring means acquires eye position information regarding the eye positions of the left eye and right eye of the subject. For example, the eye position information may be information that can represent the line-of-sight directions of the left eye and the right eye. As an example, it may be information indicating the positions of the characteristic parts of the left eye and the right eye. Further, as an example, the information may be information indicating the deviation amount of the characteristic regions of the left eye and the right eye. Further, as an example, the information may be information indicating the rotation angles of the characteristic regions of the left eye and the right eye. Note that the position of the pupil, the position of the corneal vertex, and the like may be used as the characteristic parts of the left eye and the right eye.

In this embodiment, the eye position information of the left eye and right eye of the subject may be obtained based on the anterior segment images of the left eye and right eye. For example, the eye position information of the subject's left eye and right eye may be sequentially acquired based on the anterior segment image newly acquired by the anterior segment image acquiring means.

For example, the eye position information obtaining means may detect the pupil positions of the left eye and the right eye by processing the anterior segment image, and measure the eye position based on the detected pupil positions. In this case, the pupil position may be any part of the pupil. For example, at least one of the pupil center position, the position of the outer peripheral edge of the pupil, and the like may be detected as the pupil position. Also, the eye position may be measured based on the interpupillary distances of the left and right eyes.

Further, for example, the eye position information acquiring means may detect the corneal vertex positions of the left eye and the right eye by processing the anterior segment image, and measure the eye position based on the detected corneal vertex positions. good. For example, the corneal vertex position may be detected by detecting target images projected to the left eye and right eye and based on the detected positions of the target images. Also, the eye position may be measured based on the distance between the corneal vertices of the left eye and the right eye.

Further, for example, the eye position information acquisition means detects both the pupil position and the corneal vertex position of the left eye and the right eye by processing the anterior segment image, and based on the detected pupil position and corneal vertex position, Eye position may be measured. For example, in this case, the eye position may be measured based on the amount of deviation between the pupil center position and the corneal vertex position.

<Display control means>
The subjective optometric apparatus includes display control means (for example, control unit 70). The display control means causes the display means (for example, the monitor 6a) to display a fusion image showing how the target is viewed with both eyes when the subject observes the target with the left eye and the right eye. For example, the fusion image includes a first image (for example, a first image 140L) showing how the subject observes the optotype with the left eye, and the subject observes the optotype with the right eye. and a second image (for example, the second image 140R) showing how it looks when the image is displayed.

The first image may be an image corresponding to the visual target presented to the left eye. For example, the first image may be the same image as the target image presented to the left eye. Further, for example, the first image may be an image obtained by simplifying the image of the optotype presented to the left eye. Similarly, the second image may be an image corresponding to the visual target presented to the right eye. For example, the second image may be the same image as the target image presented to the right eye. Also, for example, the second image may be an image obtained by simplifying the image of the optotype presented to the right eye. In addition, in the first image and the second image, as an example of an image obtained by simplifying the image of the optotype, an image showing the outline of the optotype may be used.

In this embodiment, the fusion image showing how the subject sees with both eyes may be displayed on the display means based on the eye position information of the left eye and the right eye. More specifically, the display control means may cause the display means to display a fusion image in which the positional relationship between the first image and the second image is set based on eye position information of the left eye and the right eye. . In this case, the distance between the first image and the second image may be set based on eye position information of the left eye and the right eye. As an example, the distance from the center of the first image to the center of the second image may be set based on eye position information of the left eye and right eye. For example, the display control means sets the display position of the first image to predetermined position coordinates based on the eye position information of the left eye, and sets the display position of the second image based on the eye position information of the right eye. It may be set to predetermined position coordinates. As a result, the fusion image is displayed on the display means such that the first image and the second image are at least partly superimposed, separated, or the like.

The display control means may cause the display means to display a fusion image obtained by changing the transmittance of at least one of the first image and the second image. For example, the display control means may change the transmittance of one of the first image and the second image, and display the image with the changed transmittance superimposed on the image without the changed transmittance. Further, for example, the display control means may change the transmittance of both the first image and the second image, and display one of the first image and the second image superimposed on the other image. . In this case, the transmittances of the first image and the second image may be changed to the same transmittance, or may be changed to different transmittances. Thereby, even if the first image and the second image are partially or wholly superimposed and displayed, the degree of overlap between the first image and the second image can be easily grasped. By changing the transmittance of the first image and the second image to different transmittances, the first image and the second image can be distinguished.

For example, such control to change the transmittance is performed at least when the positional relationship between the first image and the second image is set such that the first image and the second image partially overlap. All you have to do is Of course, this may be performed when the positional relationship between the first image and the second image is set such that the first image and the second image are entirely overlapped. Alternatively, it may be executed when the positional relationship between the first image and the second image is set so that the first image and the second image are separated from each other without overlapping.

For example, the display control means may cause the display means to display a fusion image capable of distinguishing between the first image and the second image. For example, the display control means performs at least one control such as control to change the transmittance, control to change the color, control to display the identifier, etc., for at least one of the first image and the second image. , a fusion image in which the first image and the second image are identifiable may be displayed on the display means.

For example, when changing the transmittance, the display control means may change the transmittance of the first image and the second image to different transmittances. Further, for example, when changing the colors, the display control means may change the colors of the first image and the second image to colors different from each other. As an example, the color scheme, color tone (at least one of shading, intensity, contrast, etc.), etc., of the first image and the second image may be changed. Further, for example, when displaying an identifier, the display control means may display the identifier on at least one of the first image and the second image. As an example, at least one of symbols, characters, graphics, and the like may be displayed on at least one of the first image and the second image. As a result, the first image and the second image can be distinguished from each other, making it easier to grasp the deviation between the images. That is, it becomes easier to grasp the deviation of the fusion state between the left eye and the right eye of the subject.

Note that the display control means is configured to execute any of the above-described control for changing the transmittance of the first image and the second image, control for changing the color, control for displaying the identifier, and the like. may be used, or may be configured to be executed in combination.

For example, the display control means can identify that the first image corresponds to the visual target observed with the left eye of the subject and the second image corresponds to the visual target observed with the right eye of the subject. The fusion image may be displayed on the display means. For example, the display control means performs at least one control such as control to change the transmittance, control to change the color, control to display the identifier, etc., for at least one of the first image and the second image. , the display means displays a fusion image that makes it possible to identify that the first image corresponds to the visual target observed with the left eye and the second image corresponds to the visual target observed with the right eye. good.

As an example, when changing the transmittance, the display control means changes the transmittance of the first image and the second image to be different from each other, and furthermore, the correspondence relationship between the first image and the second image and the transmittance may be presented. Further, as an example, when changing the colors, the display control means changes the colors of the first image and the second image to mutually different colors, and further changes the correspondence relationship between the first image and the second image and the colors. may be presented. Further, as an example, when displaying the identifier, the display control means may display the identifier representing left and right on at least one of the first image and the second image. This makes it easier to grasp how much the first image and the second image are shifted left and right. That is, it becomes easier to grasp the appropriateness of the fusion state between the left eye and the right eye of the subject.

The display control means displays on the display means a reference position at which the first image and the second image are positioned together with such a fusion image, and a reference position at which the state of fusion between the left eye and the right eye is good. may be displayed. In other words, the reference position where the first image and the second image are positioned and which indicates that there is no misalignment between the eye positions of the left eye and the right eye may be displayed on the display means. For example, by displaying the reference position, it is possible to easily determine the direction of the oblique direction of the left eye and the right eye from the deviation of the first image and the second image with respect to the reference position. In addition, for example, by displaying the reference position, it is possible to appropriately inspect the left eye and the right eye based on the deviation of the first image and the second image with respect to the reference position. For example, the examination may be performed by changing the presentation positions of the optotypes presented to the left eye and the right eye so that the left eye and the right eye are easily fused.

Further, the display control means may cause the display means to display fusion information indicating the state of fusion by the left eye and the right eye together with such a fusion image. For example, the fusion information may be information indicating whether the left eye and the right eye are fusioning or not. Further, for example, the fusion information may be information representing eye position shift between the left eye and the right eye based on the eye position information of the left eye and the right eye. In this case, the eye position shift between the left eye and the right eye may be expressed as a horizontal component and a vertical component. Also, in this case, the misalignment between the left eye and the right eye may be represented by a prism. As an example, the amount of prisms and the direction of the prisms may be indicated. The direction of the prism may be an index such as Base In or Base Out, an index such as inward or outward, or an angle.

In addition, the display control means is configured to execute either control to display the reference position where the first image and the second image are positioned, or control to display the fusion information of the left eye and the right eye, as described above. , or may be configured to be executed in combination.

For example, the display control means may update and display the fusion image based on the output signal for updating the fusion image. For example, the output signal may be sequentially output at the timing when the eye position information acquiring means acquires the eye position information. In this case, by setting the acquisition timing of the anterior segment image by the anterior segment image acquiring means to a predetermined time interval, each time the eye position information is acquired based on the anterior segment images acquired in sequence, the output A signal may be output. Further, in this case, the acquisition timing of the anterior segment image by the anterior segment image acquisition means is set in real time, and the acquisition timing of the eye position information by the eye position information acquisition means based on the anterior segment image acquired in real time. is set at a predetermined time interval, the output signal may be output each time the eye position information is acquired. With these configurations, the fusion image updated at predetermined time intervals can be displayed on the display means, and the fusion image changes finely and becomes difficult to see due to the subject's blinking, measurement errors, etc. It is possible to suppress

In the present embodiment, the anterior segment image obtaining means obtains an anterior segment image in real time, and the eye position information obtaining means sequentially obtains eye position information based on the newly obtained anterior segment image. Alternatively, the display control means may update the fusion image in real time based on the sequentially acquired eye position information and cause the display means to display the fusion image. As a result, changes in the state of fusion between the left eye and the right eye can be grasped in real time.

Note that the present disclosure is not limited to the apparatus described in this embodiment. For example, terminal control software (program) that performs the functions of the following embodiments is supplied to a system or device via a network or various storage media, and a control device (eg, CPU, etc.) of the system or device reads the program. It is also possible to execute

<Example>
An example of a subjective optometric apparatus (hereinafter referred to as an optometric apparatus) according to this embodiment will be described.

FIG. 1 is an external view of an optometric apparatus. For example, the optometric apparatus 1 includes a housing 2, a presentation window 3, a forehead rest 4, a chin rest 5, a controller 6, an imaging section 90, and the like.

The housing 2 has therein a measuring section 7, a deflecting mirror 81, a reflecting mirror 84, a concave mirror 85, etc., which will be described later. The presentation window 3 is used to present a visual target to the eye E to be examined. The forehead rest 4 is used to keep the distance between the subject's eye E and the optometric apparatus 1 constant. The chin rest 5 is used to keep the distance between the eye E to be examined and the optometric apparatus 1 constant.

The controller 6 includes a monitor 6a, a switch section 6b, and the like. The monitor 6a displays various kinds of information (for example, measurement results of the eye E to be examined, etc.). The monitor 6a is a touch panel, and the monitor 6a also functions as the switch section 6b. The switch section 6b is used to perform various settings (for example, input of a start signal, etc.). A signal corresponding to an operation instruction from the controller 6 is output to the control section 70 by wired communication via a cable (not shown). A signal corresponding to an operation instruction from the controller 6 may be output to the control section 70 by wireless communication via infrared rays or the like.

The imaging unit 90 includes an imaging optical system (not shown). For example, the imaging optical system is used for imaging the subject's face. For example, the imaging optical system may be composed of an imaging device and a lens.

<Measuring section>
The measurement unit 7 includes a left eye measurement unit 7L and a right eye measurement unit 7R. In this embodiment, the left-eye measuring section 7L and the right-eye measuring section 7R are made of the same member. Of course, the left-eye measuring section 7L and the right-eye measuring section 7R may be composed of at least a part of different members. The measuring unit 7 has a pair of left and right subjective measuring units described later and a pair of left and right objective measuring units described later. The target luminous flux and the measurement luminous flux from the measurement unit 7 are guided to the subject's eye E via the presentation window 3 .

FIG. 2 is a diagram showing the measuring section 7. As shown in FIG. In FIG. 2, a left eye measurement unit 7L is taken as an example of the measurement unit 7. As shown in FIG. The right eye measuring section 7R is omitted because it has the same configuration as the left eye measuring section 7L. For example, the left eye measurement unit 7L includes an objective measurement optical system 10, a subjective measurement optical system 25, a first target projection optical system 45, a second target projection optical system 46, an observation optical system 50, and the like.

<Objective measurement optical system>
The objective measurement optical system 10 is used as part of the configuration of an objective measurement unit that objectively measures the optical characteristics of an eye to be examined. In the present embodiment, as an optical characteristic of the eye E to be examined, an objective measurement unit for measuring the eye refractive power of the eye E to be examined will be described as an example. The optical characteristics of the subject's eye E may be the axial length of the eye, the shape of the cornea, etc., in addition to the refractive power of the eye. For example, the objective measurement optical system 10 is composed of a projection optical system 10a and a light receiving optical system 10b.

The projection optical system 10a projects a spot-shaped measurement index onto the fundus of the eye E to be inspected through the center of the pupil of the eye E to be inspected. For example, the projection optical system 10a includes a light source 11, a relay lens 12, a hole mirror 13, a prism 15, an objective lens 102, a dichroic mirror 35, a dichroic mirror 29, and the like.

The light-receiving optical system 10b takes out the fundus-reflected light flux reflected by the fundus of the eye E to be examined through the periphery of the pupil of the eye E to be examined in a ring shape. For example, the light receiving optical system 10b includes a dichroic mirror 29, a dichroic mirror 35, an objective lens 102, a prism 15, a hole mirror 13, a relay lens 16, a mirror 17, a light receiving diaphragm 18, a collimator lens 19, a ring lens 20, an imaging device 22, etc.

In this embodiment, the description of the projection optical system 10a and the light receiving optical system 10b is omitted. For details of these, see, for example, Japanese Patent Application Laid-Open No. 2018-47049.

<Self-aware measurement optical system>
The subjective measurement optical system 25 is used as part of the configuration of a subjective measurement unit that subjectively measures the optical characteristics of the eye E to be examined. In the present embodiment, as an example of the optical characteristics of the eye E to be inspected, a subjective measuring unit that measures the refractive power of the eye E to be inspected is taken. The optical characteristics of the subject's eye E may be contrast sensitivity, binocular vision function (for example, the amount of oblique vision, stereoscopic vision function, etc.), etc., in addition to eye refractive power. For example, the subjective measurement optical system 25 is composed of a projection optical system 30 and a correction optical system 60 .

<Light projection optical system>
The projection optical system 30 projects a target light beam toward the eye E to be examined. For example, the projection optical system 30 includes a display 31, a projection lens 33, a projection lens 34, a reflection mirror 36, an objective lens 101, a dichroic mirror 35, a dichroic mirror 29, and the like.

The display 31 displays visual targets (fixation target, test target, etc.). The target light flux emitted from the display 31 is projected onto the subject's eye E through the optical members from the projection lens 33 to the dichroic mirror 29 in order. The dichroic mirror 35 makes the optical path of the objective measurement optical system 10 and the optical path of the subjective measurement optical system 25 a common optical path. That is, the dichroic mirror 35 makes the optical axis L1 of the objective measurement optical system 10 and the optical axis L2 of the subjective measurement optical system 25 coaxial. The dichroic mirror 29 is an optical path branching member. The dichroic mirror 29 reflects the target luminous flux from the projection optical system 30 and the measurement luminous flux from the projection optical system 10a, which will be described later, and guides them to the eye E to be examined.

<Corrective optical system>
Corrective optical system 60 is arranged in the optical path of projection optical system 30 . Further, the correction optical system 60 changes the optical characteristics of the target light flux emitted from the display 31 . For example, the correction optical system 60 includes an astigmatism correction optical system 63, a drive mechanism 39 described later, and the like.

The astigmatism correcting optical system 63 is used to correct the cylindrical power and astigmatism axis angle of the eye E to be examined. The astigmatic correction optical system 63 is arranged between the projection lens 33 and the projection lens 34 . The astigmatism correcting optical system 63 is composed of two positive cylindrical lenses 61a and 61b having the same focal length. The cylindrical lens 61a and the cylindrical lens 61b are independently rotated about the optical axis L2 by driving the rotating mechanism 62a and the rotating mechanism 62b.

In this embodiment, the configuration using the cylindrical lenses 61a and 61b as the astigmatism correcting optical system 63 has been described as an example, but the present invention is not limited to this. The astigmatism correcting optical system 63 may have any structure as long as it can correct the cylindrical power, astigmatism axis angle, and the like. As an example, a corrective lens may be moved in and out of the optical path of the projection optical system 30 .

In this embodiment, the light source 11 and the relay lens 12 included in the projection optical system 10a, the light receiving aperture 18, the collimator lens 19, the ring lens 20, and the imaging element 22 included in the light receiving optical system 10b, and the light projecting optical system 30 are provided. The display 31 is integrally movable in the optical axis direction by a driving mechanism 39 . That is, the display 31, the light source 11, the relay lens 12, the light receiving diaphragm 18, the collimator lens 19, the ring lens 20, and the imaging device 22 are synchronized as the drive unit 95, and are moved integrally by the drive mechanism 39. . The drive mechanism 39 consists of a motor and a slide mechanism. A position to which the drive mechanism 39 has moved is detected by a potentiometer (not shown).

The drive mechanism 39 moves the display 31 in the direction of the optical axis L2 by moving the drive unit 95 in the direction of the optical axis. Thus, in the objective measurement, the subject's eye E can be fogged. In the subjective measurement, it is possible to optically change the presentation distance of the optotype with respect to the eye E to be inspected and correct the spherical power of the eye E to be inspected. That is, the configuration for moving the display 31 in the direction of the optical axis L2 is used as a spherical correction optical system for correcting the spherical power of the eye to be examined E, and by changing the position of the display 31, the spherical power of the eye to be examined E is corrected. be done. The configuration of the spherical correction optical system may be different from that of this embodiment. For example, multiple optical elements may be placed in the optical path to correct spherical power. Further, for example, the spherical power may be corrected by placing a lens in the optical path and moving the lens in the optical axis direction.

<First Index Projection Optical System and Second Index Projection Optical System>
The first index projection optical system 45 and the second index projection optical system 46 are arranged between the dichroic mirror 29 and a deflection mirror 81 which will be described later. The first index projection optical system 45 emits near-infrared light for projecting an infinite alignment index onto the cornea of the eye E to be examined. The second target projection optical system 46 is arranged at a position different from that of the first target projection optical system 45, and emits near-infrared light for projecting a finite alignment target onto the cornea of the subject's eye. The near-infrared light (alignment light) emitted from the second target projection optical system 46 is also used as an anterior segment imaging light for imaging the anterior segment of the subject's eye by the observation optical system 50 .

<Observation optical system>
An observation optical system (imaging optical system) 50 includes a dichroic mirror 29, an objective lens 103, an imaging lens 51, an imaging element 52, and the like. The dichroic mirror 29 transmits the anterior segment observation light and the alignment light. The imaging device 52 has an imaging plane arranged at a position conjugate with the anterior ocular segment of the eye E to be examined. An output from the imaging element 52 is input to the control section 70 . As a result, the image of the anterior segment of the subject's eye E is picked up by the imaging element 52 and displayed on the monitor 6a. The observation optical system 50 also serves as an optical system for detecting an alignment index image formed on the cornea of the subject's eye E by the first index projection optical system 45 and the second index projection optical system 46. A position of the alignment index image is detected.

<Internal Configuration of Optometry Apparatus>
The internal configuration of the optometric apparatus 1 will be described. FIG. 3 is a schematic configuration diagram of the inside of the optometric apparatus 1 viewed from the front. FIG. 4 is a schematic configuration diagram of the inside of the optometric apparatus 1 as viewed from the side. FIG. 5 is a schematic configuration diagram of the inside of the optometric apparatus 1 viewed from above. 4 and 5 show only the optical axis of the left eye measuring section 7L for convenience of explanation.

The optometric apparatus 1 includes a subjective measurement unit. For example, the subjective measurement unit is composed of the measurement unit 7, deflection mirror 81, driving mechanism 82, driving unit 83, reflecting mirror 84, concave mirror 85, and the like. Note that the subjective measurement unit is not limited to this configuration. For example, a configuration without the reflecting mirror 84 may be used. In this case, the target light flux from the measurement unit 7 may be irradiated from a direction oblique to the optical axis L of the concave mirror 85 after passing through the deflecting mirror 81 . Further, for example, a configuration having a half mirror may be used. In this case, the target luminous flux from the measurement unit 7 may be irradiated in a direction oblique to the optical axis L of the concave mirror 85 via a half mirror, and the reflected luminous flux may be guided to the eye E to be examined. .

The optometric apparatus 1 has a left eye driving section 9L and a right eye driving section 9R, and can move the left eye measuring section 7L and the right eye measuring section 7R in the X direction, respectively. can. For example, by moving the left-eye measurement unit 7L and the right-eye measurement unit 7R, the distance between the measurement unit 7 and a deflecting mirror 81, which will be described later, changes, and the target luminous flux from the measurement unit 7 changes. The presentation position in the Z direction is changed. As a result, the target light flux corrected by the correction optical system 60 is guided to the eye E to be examined, and an image of the target light flux corrected by the correction optical system 60 is formed on the fundus of the eye E to be examined. The measuring part 7 is adjusted in the Z direction.

For example, the deflection mirror 81 has a pair of left and right eye deflection mirrors 81R and 81L. For example, the deflection mirror 81 is arranged between the correction optical system 60 and the eye E to be examined. That is, the corrective optical system 60 in this embodiment has a left eye corrective optical system and a right eye corrective optical system which are provided in pairs on the left and right sides, and the left eye deflection mirror 81L is the left eye corrective optical system. system and the left eye EL, and a right eye deflection mirror 81R is arranged between the right eye correction optical system and the right eye ER. For example, the deflection mirror 81 is preferably arranged at a pupil conjugate position.

For example, the left-eye deflection mirror 81L reflects the light beam projected from the left-eye measuring section 7L and guides it to the left eye EL. Further, for example, the left eye deflection mirror 81L reflects the fundus reflected light flux from the left eye EL and guides it to the left eye measuring section 7L. For example, the right-eye deflection mirror 81R reflects the light flux projected from the right-eye measuring section 7R and guides it to the right eye ER. Further, for example, the right eye deflection mirror 81R reflects the fundus reflected light flux from the right eye ER and guides it to the right eye measuring section 7R. In this embodiment, the configuration using the deflecting mirror 81 as the deflecting member that reflects and guides the light beam projected from the measuring unit 7 to the eye E to be inspected is described as an example, but the configuration is limited to this. not. The deflection member may be a prism, a lens, or the like as long as it can reflect and guide the light flux projected from the measurement unit 7 onto the eye E to be examined.

For example, the driving mechanism 82 is composed of a motor (driving section) and the like. For example, the drive mechanism 82 has a drive mechanism 82L for driving the left-eye deflection mirror 81L and a drive mechanism 82R for driving the right-eye deflection mirror 81R. For example, the driving mechanism 82 drives the deflection mirror 81 to rotate. For example, the drive mechanism 82 rotates the deflection mirror 81 about a horizontal (X direction) rotation axis and a vertical (Y direction) rotation axis. That is, the drive mechanism 82 rotates the deflection mirror 81 in the XY directions. Note that the deflection mirror 81 may be rotated in either the horizontal direction or the vertical direction.

For example, the drive unit 83 is composed of a motor or the like. For example, the drive section 83 has a drive section 83L for driving the left-eye deflection mirror 81L and a drive section 83R for driving the right-eye deflection mirror 81R. For example, the drive unit 83 drives the deflection mirror 81 in the X direction. For example, by moving the left-eye deflection mirror 81L and the right-eye deflection mirror 81R, the distance between the left-eye deflection mirror 81L and the right-eye deflection mirror 81R is changed, and the distance between the pupils of the subject's eye E is changed. Depending on the distance, the distance in the X direction between the left-eye optical path and the right-eye optical path can be changed.

For example, a plurality of deflection mirrors 81 may be provided in each of the left-eye optical path and the right-eye optical path. For example, there is a configuration in which two deflection mirrors are provided in each of the left-eye optical path and the right-eye optical path (for example, a configuration in which two deflection mirrors are provided in the left-eye optical path, etc.). In this case, one deflection mirror may be rotated in the X direction and the other deflection mirror may be rotated in the Y direction. For example, by rotating the deflecting mirror 81, an apparent light beam for forming an image of the target light beam in front of the eye to be examined is deflected, and the formation position of the image of the target light beam is optically corrected. can be done.

For example, the concave mirror 85 is shared by the left eye measuring section 7L and the right eye measuring section 7R. For example, the concave mirror 85 is shared by the left-eye optical path including the left-eye corrective optical system and the right-eye optical path including the right-eye corrective optical system. That is, the concave mirror 85 is arranged at a position where it passes through both the left-eye optical path including the left-eye correction optical system and the right-eye optical path including the right-eye correction optical system. Of course, the concave mirror 85 does not have to be shared by the left-eye optical path and the right-eye optical path. That is, the configuration may be such that a concave mirror is provided in each of the left-eye optical path including the left-eye correction optical system and the right-eye optical path including the right-eye correction optical system. For example, the concave mirror 85 guides the target light flux that has passed through the corrective optical system 60 to the eye E to be inspected, and forms an image of the target light flux that has passed through the corrective optical system 60 in front of the eye E to be inspected.

<Optical path of subjective measurement part>
The optical path of the subjective measurement unit will be described by taking the optical path for the left eye as an example. The optical path for the right eye has the same configuration as the optical path for the left eye. For example, in the subjective measurement unit for the left eye, the target light beam emitted from the display 31 in the subjective measurement optical system 25 enters the astigmatism correction optical system 63 via the projection lens 33, and enters the astigmatism correction optical system 63. 63, the light is guided from the left eye measurement unit 7L to the left eye deflection mirror 81L via the projection lens 34, the reflection mirror 36, the objective lens 101, the dichroic mirror 35, and the dichroic mirror 29. be done. The target luminous flux reflected by the left-eye deflecting mirror 81L is reflected by the reflecting mirror 84 toward the concave mirror 85 . The optotype light flux emitted from the display 31 reaches the left eye EL via each optical member in this manner.

As a result, an image of the target luminous flux corrected by the corrective optical system 60 is formed on the fundus of the left eye EL with reference to the spectacle wearing position of the left eye EL (for example, about 12 mm from the corneal vertex position). Therefore, the adjustment of the spherical power by the spherical power correcting optical system (in this embodiment, the drive mechanism 39 is driven) is performed in front of the eye, and the astigmatism correcting optical system 63 is arranged as if it were in front of the eye. are equivalent. In a natural state, the subject can collimate the target light beam image formed in front of the eyes at a predetermined examination distance optically via the concave mirror 85 .

<Control section>
FIG. 6 is a diagram showing a control system of the optometric apparatus 1. As shown in FIG. For example, various members such as the monitor 6a, the nonvolatile memory 75 (hereinafter referred to as the memory 75), the light source 11, the image sensor 22, the display 31, and the image sensor 52 included in the measurement unit 7 are electrically connected to the control unit 70. It is Further, for example, the control unit 70 is electrically connected to drive units (not shown) including the drive unit 9, the drive mechanism 39, the drive unit 83, and the like.

For example, the control unit 70 includes a CPU (processor), RAM, ROM, and the like. For example, the CPU controls each member in the optometric apparatus 1 . For example, RAM temporarily stores various information. For example, the ROM stores various programs, targets, initial values, and the like for controlling the operation of the optometric apparatus 1 . Note that the controller 70 may be configured by a plurality of controllers (that is, a plurality of processors).

For example, the memory 75 is a non-transitory storage medium that can retain stored content even when the power supply is interrupted. For example, the memory 75 can be a hard disk drive, flash ROM, USB memory, or the like. For example, the memory 75 stores a control program for controlling the objective measurement section and the subjective measurement section.

<Control operation>
A control operation of the optometric apparatus 1 will be described.

<Alignment of measurement unit with respect to eye to be examined>
The examiner instructs the examinee to place the chin on the chin rest 5 and observe the presentation window 3 . Further, the examiner operates the switch section 6b to select a fixation target for fixating the eye E to be examined. The control unit 70 causes the display 31 to display the fixation target according to the input signal from the switch unit 6b. A fixation target is presented in front of the subject's eye E by projecting the target light flux from the display 31 .

Subsequently, the examiner operates the switch section 6 b to select a switch for starting alignment between the eye E to be examined and the measurement section 7 . The control unit 70 projects an alignment index image onto the cornea of the eye E to be examined by the first index projection optical system 45 and the second index projection optical system 46 according to the input signal from the switch unit 6b. Further, the control unit 70 uses the alignment index image to detect deviations of the measurement unit 7 in the X, Y, and Z directions with respect to the eye E, and moves the measurement unit 7 based on these deviations. This completes the alignment.

<Acquisition of optical characteristics by subjective measurement>
When the alignment of the measurement unit 7 with respect to the eye E to be examined is completed, the examiner starts subjective measurement of the eye E to be examined. For example, the subjective measurement is sequentially performed on the left eye EL and the right eye ER, and the subjective value of the left eye EL and the subjective value of the right eye ER are obtained.

The examiner operates the switch section 6b to select a predetermined test target (for example, Landolt's ring target) and a predetermined presentation distance (test distance) for presenting the test target. The control unit 70 causes the display 31 to display the test target in response to the input signal from the switch unit 6b. Further, the control unit 70 controls driving of the drive mechanism 39 to move the display 31 along the optical axis L2 so that the optical distance from the subject's eye E to the display 31 becomes a predetermined presentation distance.

Subsequently, the examiner operates the switch section 6b to set a desired correction power. The examiner acquires in advance the optical characteristics of the eye E to be examined (for example, the optical characteristics in objective measurement of the eye E to be examined, the optical characteristics in subjective measurement of the eye E to be examined, etc.), and based on this, A desired correction power may be set. The control unit 70 controls at least one of the projection optical system 30 and the correction optical system 60 according to the input signal from the switch unit 6b. For example, the control unit 70 may correct the spherical power of the subject's eye E by driving the drive mechanism 39 and moving the display 31 in the direction of the optical axis L2. Further, for example, the control unit 70 drives the rotation mechanism 62a and the rotation mechanism 62b to rotate the cylindrical lens 61a and the cylindrical lens 61b around the optical axis L2b. and/or may be corrected. As a result, the ocular refraction of the subject's eye E is corrected with a predetermined diopter value (for example, 0D).

The examiner operates the switch section 6b to switch the visual acuity value of the test optotype to be presented to the eye E to be examined, and confirms whether or not the correction power for correcting the eye E to be examined is appropriate. If the correction power for correcting the eye to be examined E is inappropriate, the ocular refraction of the eye to be examined E is corrected with a diopter value different from the predetermined diopter value, and it is again checked whether the correction power is appropriate. You can check. The control unit 70 acquires the correction power judged appropriate by the examiner as the subjective value of the eye E to be examined, and stores it in the memory 75 .

<Acquisition of reference image>
In this embodiment, prior to starting the subjective measurement for both eyes, which will be described later, a reference image to be used for determining eye misalignment is acquired in advance. For example, a reference image may be acquired by fixating a fixation target or the like before the subjective measurement in which the subjective values of the left eye EL and the right eye ER are sequentially measured. Further, for example, the reference image may be acquired during the subjective measurement in which the subjective values of the left eye EL and the right eye ER are sequentially measured. For example, the reference image may be an anterior segment image in which the left eye EL and the right eye ER observe a visual target (fixation target or test target) placed in front of each eye. . Of course, the anterior segment image may be a state in which the left eye EL and the right eye ER observe a visual target arranged in a direction different from the front direction.

Here, a case where the reference image is acquired during the subjective measurement (during the subjective measurement for one eye) is taken as an example. For example, while the subjective value of the left eye EL (right eye ER) is being measured, the left eye EL (right eye ER) observes a predetermined test target at a predetermined presentation distance. An image is previously acquired as a reference image. The control unit 70 irradiates the cornea of the left eye EL (right eye ER) with the measurement light flux from the infrared light sources provided in the first index projection optical system 45 and the second index projection optical system 46, and the left eye EL ( A bright spot image is projected onto the cornea of the right eye (ER). The control unit 70 also acquires a reference image of the left eye EL (right eye ER) using the imaging device 52 of the observation optical system 50 .

FIG. 7 is an example of reference images for the left eye EL and right eye ER. FIG. 7A shows a reference image 120L for the left eye EL. FIG. 7B shows a reference image 120R for the right eye ER. As the reference image 120L of the left eye EL, a bright spot image 125 formed on the cornea of the left eye EL is displayed together with the image of the left eye EL. The bright spot image 125 consists of a ring index image B1 that appears with the infrared light source of the first index projection optical system 45 and a ring index image B2 that appears with the infrared light source of the second index projection optical system 46 .

The control unit 70 analyzes the reference image 120L and detects the pupil and the bright spot image 125 from the rise and fall of luminance. Further, the control unit 70 detects the pupil center position PL by calculating the center of the pupil. Further, the control unit 70 detects the corneal vertex position KL by calculating the center of the ring index image B2. Of course, the control unit 70 may detect the corneal apex position KL from the ring index image B1, or may detect the corneal apex position KL from the ring index image B1 and the ring index image B2. Similarly, as the reference image 120R of the right eye ER, the image of the right eye ER and the bright point image 125 formed on the cornea of the right eye ER are displayed. The control unit 70 analyzes the reference image 120R to detect the pupil center position PR and the corneal vertex position KR of the right eye ER.

For example, the control unit 70 stores in the memory 75 the shift amount ΔdL1 between the pupil center position PL of the left eye EL and the corneal vertex position KL detected from the reference image 120L. Further, for example, the control unit 70 stores in the memory 75 the shift amount ΔdR1 between the pupil center position PR of the right eye ER and the corneal vertex position KR detected from the reference image 120R.

<Confirmation of fusion state>
Subsequently, the examiner presents the test optotype for the left eye to the left eye EL at a predetermined presentation distance while correcting the left eye EL, and presents the test target for the left eye to the right eye ER while correcting the right eye ER. A test optotype for the right eye is presented at a predetermined presentation distance, and the fusion test by the left eye EL and the right eye ER is started.

For example, the examiner can determine the state of fusion between the subject's left eye EL and right eye ER from the subject's response or the like. However, in this embodiment, the appearance when the subject observes the test optotype with the left eye EL and the right eye ER (that is, the appearance when the subject observes the test optotype with both eyes) is displayed on the monitor 6a. This allows the examiner to easily imagine the fusion state of the subject's left eye EL and right eye ER. In addition, this allows the examiner to perform an appropriate fusion test on the subject's left eye EL and right eye ER. This will be explained below.

For example, the examiner operates the switch section 6b to select a predetermined test target to be presented to the left eye EL and the right eye ER and a predetermined presentation distance. In response to an input signal from the switch unit 6b, the control unit 70 causes the display 31 (hereinafter referred to as the display 31L) provided in the left eye measurement unit 7L to display the test optotype for the left eye, and the right eye measurement unit 7R A test optotype for the right eye is displayed on the provided display 31 (hereinafter referred to as display 31R), and these displays are moved in the direction of the optical axis L2.

<Calculation of Displacement of Eye Position Based on Image of Anterior Segment>
While presenting the test target to the left eye EL and the right eye ER, the control unit 70 projects the bright point images onto the corneas of the left eye EL and the right eye ER to produce an anterior segment image of the left eye EL, and an anterior segment image of the right eye ER are respectively acquired.

FIG. 8 is an example of the anterior segment images of the left eye EL and right eye ER. FIG. 8A shows an anterior segment image 150L of the left eye EL. FIG. 8B shows an anterior segment image 150R of the right eye ER. The control unit 70 analyzes the anterior segment image 150L of the left eye EL, detects the pupil center position PL and the corneal vertex position KL of the left eye EL, and analyzes the anterior segment image 150R of the right eye ER. , the pupil center position PR and the corneal vertex position KR of the right eye ER. The control unit 70 also obtains a shift amount ΔdL2 between the pupil center position PL and the corneal vertex position KL of the left eye EL, and a shift amount ΔdR2 between the pupil center position PR and the corneal vertex position KR of the right eye ER.

The control unit 70 determines whether the eye positions of the left eye EL and the right eye ER are normal based on the amount of deviation (the amount of deviation ΔdL1 and the amount of deviation ΔdR1) obtained from the reference image 120 of the left eye EL and the right eye ER. The amount of deviation (the amount of deviation ΔdL2 and the amount of deviation ΔdR2) obtained from the anterior segment images obtained during the subjective measurement of the eye EL and the right eye ER is used for determination.

For example, the control unit 70 determines whether or not the shift amount ΔdL2 exceeds a preset threshold with respect to the shift amount ΔdL1 in the left eye EL. For example, the control unit 70 may determine that the eye position of the left eye EL is normal when the shift amount ΔdL2 exceeds a predetermined threshold with respect to the shift amount ΔdL1. Further, for example, the control unit 70 may determine that the eye position of the left eye EL is misaligned when the misalignment amount ΔdL2 is less than a predetermined threshold with respect to the misalignment amount ΔdL1.

Similarly, the control unit 70 determines whether or not the shift amount ΔdR2 exceeds a preset threshold with respect to the shift amount ΔdR1 in the right eye ER. For example, the control unit 70 may determine that the eye position of the right eye ER is normal when the shift amount ΔdR2 exceeds a predetermined threshold with respect to the shift amount ΔdR1. Further, for example, the control unit 70 may determine that the eye position of the right eye ER is misaligned when the amount of misalignment ΔdR2 relative to the amount of misalignment ΔdR1 is less than a predetermined threshold for the right eye ER.

Note that, in this embodiment, an allowable range may be provided for the threshold of the amount of deviation between the left eye EL and the right eye ER. For example, the control unit 70 determines the misalignment of the left eye EL and the right eye ER based on the allowable range (that is, the misalignment of the left eye EL and the right eye ER from the upper limit to the lower limit of the allowable range). By determining whether or not it is settled), it can be considered that there is no eye position deviation when the eye position deviation between the left eye EL and the right eye ER is slight. For this reason, it is possible to suppress changes in minute deviations due to measurement errors or the like.

For example, when the eye positions of the left eye EL and the right eye ER are normal (that is, when there is no eye position deviation in either the left eye EL or the right eye ER), the left eye EL and the right eye ER are the test targets can be considered to be fused. Further, for example, if at least one of the left eye EL and the right eye ER has misalignment, it may be possible that the left eye EL and the right eye ER cannot fuse the test optotype.

<Display of fusion image>
The control unit 70 monitors a fusion image showing how the subject observes the test optotype with both eyes based on the direction and deviation amount of the corneal vertex position in the left eye EL and the right eye ER. 6a. For example, based on the direction of the corneal vertex position KL of the left eye EL and the amount of deviation ΔdL, the control unit 70 generates a first image showing how the left eye EL observes the test optotype for the left eye. It is displayed on the monitor 6a. Further, for example, the control unit 70 generates a second image showing how the right eye ER observes the test target for the right eye based on the direction of the corneal apex position KR of the right eye ER and the amount of deviation ΔdR. is displayed on the monitor 6a. That is, the control unit 70 causes the monitor 6a to display a fusion image including the first image and the second image.

FIG. 9 is an example of the display screen of the monitor 6a. FIG. 9(a) shows the display screen when the left eye EL and the right eye ER are misaligned. FIG. 9(b) shows a display screen in a state where the left eye EL is not misaligned and the right eye ER is misaligned. FIG. 9(c) shows the display screen when the left eye EL and right eye ER are not misaligned. In this embodiment, the monitor 6a displays a fusion image 140 (a first image 140L and a second image 140R), a reference position 130, an identification mark 135, fusion information 138, and the like. For example, the reference position 130 is the position where the first image 140L and the second image 140R are positioned when there is no misalignment between the left eye EL and the right eye ER. For example, the identification mark 135 is a mark that enables identification of the first image 140L and the second image 140R. For example, the fusion information 138 is information indicating the state of fusion between the left eye EL and the right eye ER. Note that the anterior segment image 150L of the left eye EL, the anterior segment image 150R of the right eye ER, and the like may be displayed together on the monitor 6a.

The control unit 70 sets the display position of the first image 140L based on the misalignment of the left eye EL. For example, the control unit 70 determines the movement direction and the movement amount of the display position of the first image 140L with respect to the reference position 130 based on the shift amount ΔdL2 of the left eye EL. Similarly, the control unit 70 sets the display position of the second image 140R based on the misalignment of the right eye ER. For example, the control unit 70 determines the movement direction and the movement amount of the display position of the second image 140R with respect to the reference position 130 based on the shift amount ΔdL2 of the right eye ER. Note that the amount of deviation ΔdL2 and the amount of deviation ΔdR2 in the left eye EL and the right eye ER may be associated in advance with the number of pixels forming the display screen of the monitor 6a.

As a result, the display position is set such that the center CL of the first image 140L is arranged at a predetermined position based on the eye position deviation with respect to the reference position 130 . again. As a result, the display position is set such that the center CR of the second image 140R is arranged at a predetermined position based on the eye position deviation with respect to the reference position 130. FIG.

For example, when both the left eye EL and the right eye ER are misaligned, the center CL of the first image 140L and the center CR of the second image 140R are misaligned with respect to the reference position 130. The display position is set so that it is arranged at a predetermined position based on the Therefore, for example, as shown in FIG. 9A, the first image 140L and the second image 140R are displayed separately without overlapping each other. For example, in a state where the left eye EL is not out of alignment and the right eye ER is out of alignment, the center CL of the first image 140L is located at the reference position 130, and the center CR of the second image 140R is located at the reference position 130. The display position is set so as to be arranged at a predetermined position based on the eye position deviation with respect to the . Therefore, for example, as shown in FIG. 9B, the first image 140L and the second image 140R are partially overlapped and displayed.

In addition, in FIGS. 9A and 9B, the greater the eye misalignment of at least one of the left eye EL and the right eye ER, the further apart the first image 140L and the second image 140R are displayed. . In addition, in FIGS. 9A and 9B, the smaller the misalignment of at least one of the left eye EL and the right eye ER, the more partially the first image 140L and the second image 140R overlap. Is displayed.

Further, for example, when there is no eye misalignment between the left eye EL and the right eye ER, the center CL of the first image 140L is positioned at the reference position 130, and the center CR of the second image 140R is positioned at the reference position. 130. Therefore, for example, as shown in FIG. 9C, the first image 140L and the second image 140R match and are displayed so as to be entirely overlapped.

For example, the examiner confirms the monitor 6a and confirms the positional relationship between the first image 140L and the second image 140R, thereby easily grasping the appropriateness of the state of fusion between the left eye EL and the right eye ER. be able to.

In this embodiment, when at least a portion of the first image 140L and the second image 140R overlap and one of the first image 140L and the second image 140R is hidden behind the other image, the It may be difficult to confirm the positional relationship between the first image 140L and the second image 140R, and it may not be possible to grasp the appropriateness of the state of fusion between the left eye EL and the right eye ER. In particular, such a situation is likely to occur when the first image 140L and the second image 140R partially overlap each other. Therefore, the control unit 70 may change the transmittance of the first image 140L and the second image 140R and display them on the monitor 6a. As an example, the transmittance of the first image 140L and the second image 140R may each be set to 50% and displayed on the monitor 6a. This allows the examiner to visually recognize both the first image 140L and the second image 140R even when at least a part of the first image 140L and the second image 140R overlap.

Further, in this embodiment, when the first image 140L and the second image 140R do not overlap, or when the first image 140L and the second image 140R partially overlap, the left eye EL is the test target. It may be difficult to know which of the first image 140L and the second image 140R corresponds to the appearance obtained by observing , and the appearance obtained by observing the test optotype with the right eye ER. Therefore, the control unit 70 may display the identification mark 135 on the first image 140L and the second image 140R. As an example, a symbol representing left may be attached to the first image 140L, and a symbol representing right may be attached to the second image 140R. This allows the examiner to easily understand which image, the left eye EL or the right eye ER, corresponds to the first image 140L or the second image 140R. This also allows the examiner to determine whether the image observed with either the left eye EL or the right eye ER is deviated from the above-described reference position 130 (in other words, the left eye EL and the right eye ER which eye misalignment occurs) can be intuitively understood.

Furthermore, in this embodiment, the control unit 70 may display fusion information 138 on the first image 140L and the second image 140R. For example, the fusion information 138 may be the amount of prism that represents the misalignment of the left eye EL and right eye ER. As an example, numerical values such as 8 prisms (Δ8), 5 prisms (Δ5), etc. may be displayed. Further, for example, the fusion information 138 may be the direction of the prism (the direction of the base) that represents the misalignment of the left eye EL and the right eye ER. As an example, indicators such as Base In (BI) and Base Out (BO) may be displayed. As a result, particularly when the first image 140L and the second image 140R are separated from each other or when they partially overlap each other, the degree of misalignment between the left eye EL and the right eye ER can be easily understood, and the left eye EL In addition, it is possible to grasp the adequacy of the fusion state (for example, the degree of poor fusion state) by the right eye ER.

<Prescription based on eye misalignment>
For example, the examiner grasps the state of fusion between the left eye EL and the right eye ER from the positional relationship between the first image 140L and the second image 140R, and thereby obtains an appropriate image for the left eye EL and the right eye ER. can prescribe. For example, when the fusion image 140 as shown in FIGS. 8(a) and 8(b) is displayed on the display screen of the monitor 6a, the examiner views the misaligned eye ( For example, a prism lens based on the above-described prism quantity) may be arranged.

Further, for example, the examiner may move the presentation position of the test target based on the eye position deviation so that the left eye EL and the right eye ER are easily fused. In this case, the control unit 70 moves the apparent presentation position of the test target for the left eye EL and the right eye ER (that is, the apparent presentation position on the display screens of the displays 31L and 31R). The rotation of 81 may be controlled to change the convergence angle. For example, the amount of rotation of the deflection mirror 81 may be automatically set based on the misalignment between the left eye EL and the right eye ER. Further, for example, the amount of rotation of the deflection mirror 81 may be manually set by the examiner operating the monitor 6a. As an example, the amount of rotation of the deflection mirror 81 may be set based on the amount of movement by which the examiner moves the display position of at least one of the first image 140L and the second image 140R on the monitor 6a. Note that the number of pixels forming the display screen of the monitor 6a and the amount of rotation of the deflection mirror 81 may be associated in advance.

As a result, for example, the fusion image 140 shown in FIGS. 8A and 8B changes to the fusion image 140 shown in FIG. 8C on the display screen of the monitor 6a. That is, the first image 140L and the second image 140R approach each other, and the first image 140L and the second image 140R change so as to coincide with each other. For example, in such a case, the examiner can determine that the poor fusion state due to the left eye EL and right eye ER has been improved.

As described above, for example, the subjective optometry apparatus of the present embodiment, based on the eye position information of the left eye and right eye of the examinee, indicates how the optotype is viewed with the left eye. A fusion image is displayed in which the positional relationship between the first image and the second image showing how the visual target is viewed with the right eye is set. This allows the examiner to easily imagine how the examinee sees the visual target with the left eye and the right eye. In addition, this allows the examiner to easily grasp the state of fusion between the left eye and the right eye of the subject.

Also, for example, the subjective optometry apparatus in this embodiment displays a fusion image in which the transmittance of at least one of the first image and the second image is changed. As a result, even if the first image and the second image overlap entirely or partially, the examiner can easily grasp the degree of overlap between the first image and the second image. can. In particular, when the first image and the second image partially overlap each other, the boundary between the first image and the second image can be seen, making it easier to grasp the mutual deviation. By changing the transmittances of the first image and the second image to different transmittances, it is also possible to distinguish between the first image and the second image.

Also, for example, the subjective optometry apparatus of the present embodiment displays a fusion image that allows discrimination between the first image and the second image. This makes it easier for the examiner to distinguish each image and grasp the shift between the first image and the second image.

Further, for example, the subjective optometric apparatus in this embodiment can identify that the first image corresponds to the visual target observed with the left eye and the second image corresponds to the visual target observed with the right eye. Display the fusion image. As a result, the examiner can distinguish between the images, and can easily grasp the deviation between the first image and the second image. compliance) can be easily checked. For example, depending on the fusion state of the left eye and the right eye, the first image is not always positioned on the left side of the display screen of the monitor and the second image is positioned on the right side. If each image is made to correspond to the visual target observed with each eye, even in such a case, the examiner can easily understand the degree of left-right deviation.

Further, for example, the subjective optometric apparatus in the present embodiment is a reference position where the first image and the second image are positioned together with the fusion image, and is the reference position where the fusion state of the left eye and the right eye is good. display the position. Accordingly, the examiner can easily determine the directions of the obliqueness of the left eye and the right eye, etc. from the deviation of the first image and the second image with respect to the reference position. In addition, this allows the examiner to appropriately inspect the left eye and right eye based on the displacement of the first image and the second image with respect to the reference position.

Further, for example, the subjective optometry apparatus in the present embodiment displays fusion information indicating a state of fusion together with the fusion image. For example, the adequacy of the fusion state, the amount of deviation between the left eye and the right eye, and the like may be displayed. This allows the examiner to more easily grasp the state of fusion between the left eye and the right eye of the subject.

Also, for example, the subjective optometry apparatus in this embodiment displays a fusion image in which the first image and the second image are superimposed. For this reason, compared to the case where an image corresponding to the visual target observed with the left eye and an image corresponding to the visual target observed with the right eye are displayed separately, the vision with both eyes of the subject is improved. can intuitively imagine.

<transformation example>
Note that, in the present embodiment, the configuration for acquiring the anterior segment images of the left eye EL and the right eye ER by using the observation optical system 50 has been described as an example, but the present invention is not limited to this. For example, in the present embodiment, an imaging optical system (not shown) included in the imaging unit 90 may be used to acquire the anterior segment images of the left eye EL and the right eye ER. For example, in this case, a facial image including at least the subject's left eye EL and right eye ER is acquired as the anterior segment image. The control unit 70 acquires the eye positions of the left eye EL and the right eye ER from the face image (anterior segment image), and displays a fusion image based on the eye positions on the monitor 6a.

Here, when the subject's face is tilted, fusion by the left eye EL and the right eye ER cannot be performed well, and the first image 140L and the second image 140R in the fusion image are displaced in the vertical direction. may be displayed. Therefore, the control unit 70 may display the face image on the monitor 6a together with the fusion image. By checking the face image, the examiner determines whether the poor fusion state of the left eye EL and the right eye ER is based on the tilt of the face or misalignment of the eyes. can be judged easily.

In this embodiment, the configuration in which the test target is presented to the left eye EL and the right eye ER at a predetermined presentation distance has been described as an example, but the present invention is not limited to this. In the present embodiment, a configuration may be adopted in which test targets are presented to the left eye EL and the right eye ER by continuously changing the presentation distance. The control unit 70 controls the displays on the displays 31L and 31R, and gradually moves the displays 31L and 31R at a constant speed, thereby providing the left eye EL and the right eye ER with an examination image corresponding to the presentation distance. mark can be presented.

For example, at this time, the control unit 70 acquires the anterior segment images of the left eye EL and the right eye ER in real time while moving the display 31L and the display 31R. The eye position may be acquired sequentially based on the images. Further, for example, the control unit 70 outputs an output signal for updating the fusional image each time a new eye position is acquired, updates the fusional image in real time based on the output signal, and monitors the monitor 6a. may be displayed in As a result, changes in the state of fusion between the left eye EL and the right eye ER can be grasped in real time.

In this embodiment, a first image 140L showing how the test target is viewed with the left eye EL, and a second image 140R showing how the test target is viewed with the right eye ER. , are images of the same size, but the present invention is not limited to this. For example, the first image 140L and the second image 140R may be images of different sizes. For example, even if the test optotype presented to the left eye EL and the test optotype presented to the right eye ER are of the same size, the diopter of the left eye EL and the right eye ER is 2D or more. If there is a difference in , etc., the state of anisotropic vision tends to occur. Therefore, the control unit 70 may change the sizes of the first image 140L and the second image 140R in consideration of the difference in power between the left eye EL and the right eye ER, and display them on the monitor 6a. When the first image 140L and the second image 140R are displaced from the reference position 130, the examiner believes that the poor state of fusion between the left eye EL and the right eye ER is based on anisotropic vision. It can be inferred that there is

For example, in such a case, the control unit 70 may cause the display 31L and the display 31R to display test targets that take into account the difference in power between the left eye EL and the right eye ER. That is, the control unit 70 may display the test optotype presented to the left eye EL and the test optotype presented to the right eye ER in different sizes on the displays 31L and 31R. This may improve the state of anisotropic vision in the left eye EL and the right eye ER. The examiner again confirms the deviation between the first image 140L and the second image 140R with respect to the reference position 130, and examines whether or not the poor state of fusion between the left eye EL and the right eye ER is improved. good too.

In this embodiment, when presenting the test optotype to the left eye EL and right eye ER of the subject, the parallax is set based on the presentation distance of the test optotype to the left eye EL and right eye ER. good too. In this case, the control unit 70 sets a parallax amount such that the left-eye test target displayed on the display 31L and the right-eye test target displayed on the display 31R float (or sink). It is possible to give a three-dimensional effect to the test optotype. For example, when the test optotypes are presented to the left eye EL and the right eye ER at the distance presentation distance, the parallax amount of each test optotype is set small. Further, for example, when the test optotypes are presented to the left eye EL and the right eye ER at the near presentation distance, the amount of parallax of each test optotype is set large. This makes it easier for the left eye EL and the right eye ER to fuse the left eye test target and the right eye test target when presented with these test targets.

The control unit 70 acquires the eye position from each anterior segment image in the state where the left eye EL and the right eye ER observe such an examination target, and displays a fusion image based on the eye position on the monitor 6a. Let At this time, similarly to the test visual targets presented to the left eye EL and the right eye ER, the first image 140L showing how the test visual target appears in the left eye EL and the appearance of the test visual target in the right eye ER are shown. If the amount of parallax is set for the second image 140R, it may be difficult to confirm the fusion state. For example, the subject observes the test visual target with parallax at a predetermined presentation distance, but the examiner observes the first image 140L and the second image 140R with parallax at a distance different from the predetermined presentation distance. Therefore, even if these images are totally superimposed, it seems that there is a misalignment.

Therefore, the control unit 70 may control the display of the first image 140L and the second image 140R so that even if the first image 140L and the second image 140R overlap as a whole, such deviation does not occur. For example, the control unit 70 may display the first image 140L and the second image 140R for which the amount of parallax is not set. Further, for example, the control unit 70 may set the amount of parallax for the first image 140L and display it, and may display the same image as the first image 140L as the second image 140R. Of course, for example, the control unit 70 may set the amount of parallax for the second image 140R and display it, and may display the same image as the second image 140R as the first image 140L.

1 Subjective Optometry Apparatus 7 Measurement Unit 25 Subjective Measurement Optical System 70 Control Unit 75 Memory 81 Deflecting Mirror 84 Reflecting Mirror 85 Concave Mirror

Claims (6)

A subjective optometry apparatus for subjectively measuring optical characteristics of the left eye and the right eye, comprising optotype presenting means for presenting optotypes to the left and right eyes of a subject,
an anterior segment image acquiring means for acquiring an anterior segment image of the left eye and the right eye in a state where the target is presented to the left eye and the right eye;
eye position information acquiring means for acquiring eye position information of the left eye and the right eye based on the anterior segment image;
A fusion image including a first image showing how the target looks when viewed with the left eye and a second image showing how the target looks when viewed with the right eye, wherein , a display control means for causing a display means to display a fusion image showing how the visual target is viewed with the left eye and the right eye;
with
The display control means displays on the display means the fusion image in which the positional relationship between the first image and the second image is set based on the eye position information, and the left eye and the right eye A subjective optometric device characterized by being able to grasp a fusional state. In the subjective optometric device of claim 1,
The subjective optometry apparatus, wherein the display control means causes the display means to display the fusion image obtained by changing the transmittance of at least one of the first image and the second image. In the subjective optometric device of claim 1 or 2,
The subjective optometry apparatus, wherein the display control means causes the display means to display the fusion image capable of distinguishing between the first image and the second image. In the subjective optometric device according to claims 1 to 3,
The display control means is configured to be capable of identifying that the first image corresponds to the visual target observed with the left eye and the second image corresponds to the visual target observed with the right eye. A subjective optometric apparatus, characterized in that an image is displayed on the display means. In the subjective optometric device according to any one of claims 1 to 4,
The display control means determines a reference position at which the first image and the second image are positioned together with the fusion image, and which is a reference position at which the fusion state of the left eye and the right eye is good. and a subjective optometric apparatus characterized by displaying on said display means. A subjective optometric program for use in a subjective optometric apparatus that has optotype presenting means for presenting optotypes to the left and right eyes of an examinee and subjectively measures the optical characteristics of the left and right eyes. and
By being executed by the processor of the subjective optometric device,
an anterior segment image acquiring step of acquiring an anterior segment image of the left eye and the right eye in a state in which the visual target is presented to the left eye and the right eye;
an eye position information acquiring step of acquiring eye position information of the left eye and the right eye based on the anterior segment image;
A fusion image including a first image showing how the target looks when viewed with the left eye and a second image showing how the target looks when viewed with the right eye, wherein , a display control step of causing a display means to display a fusion image showing how the visual target is viewed with both eyes when the visual target is observed with the left eye and the right eye;
causing the subjective optometric device to execute
The display control step displays on the display means the fusion image in which the positional relationship between the first image and the second image is set based on the eye position information, and the left eye and the right eye A subjective optometry program characterized by making it possible to grasp the state of fusion.

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