JP7331530B2 - Ophthalmic measuring device - Google Patents

Description

The present disclosure relates to an ophthalmologic measurement apparatus that objectively measures optical characteristics of an eye to be examined.

An ophthalmologic measuring apparatus is known that measures the objective optical characteristics of a subject's eye by projecting a measurement light flux toward the fundus of the subject's eye and receiving a fundus reflected light flux that is the measurement light flux reflected by the fundus. ing.

JP 2006-187483 A

The optical characteristics of the subject's eye, the adjustment information when the presentation distance of the fixation target to the subject's eye is changed, and the like, which are measured using the ophthalmologic measuring apparatus, are performed for each eye. At the time of measurement, it is said that it is preferable to confirm the fixation target in a state close to natural vision, but it is difficult to say that the measurement for each eye is close to natural vision.

In view of the above-described conventional technology, the technical problem of the present disclosure is to provide an ophthalmic measurement apparatus capable of performing measurement in a state in which the subject's eye is appropriately fused in a manner close to natural vision.

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

An ophthalmologic measurement apparatus according to the present disclosure includes fixation target presenting means for presenting a fixation target to the left eye and right eye of a subject, and objectively measuring the eye refractive power of the left eye and the right eye. an ophthalmologic measurement apparatus comprising: objective measurement means, eye position information acquiring means for continuously acquiring eye position information relating to the eye positions of the left eye and the right eye; and the left eye and the right eye. presentation distance changing means for continuously changing the presentation distance of the fixation target to the left eye and the right eye based on the continuous change of the presentation distance of the fixation target; presentation position changing means for continuously changing a presentation position to a presentation position that allows binocular fusion by the left eye and the right eye and that corresponds to the presentation distance; and the left eye. and adjustment information acquisition means for acquiring adjustment information relating to the adjustment function of the right eye, wherein the presentation distance change means is configured to adjust the left eye and the By detecting the release of the fusion state by the right eye, the control for gradually changing the presentation distance of the fixation target from far to near is stopped, and the objective measurement means controls the left eye and The ocular refractive power of the right eye is continuously measured from at least after the change of the presentation distance of the fixation target is started until the change of the presentation distance of the fixation target is stopped. and the accommodation information obtaining means obtains the binocular vision with the left eye and the right eye based on the change in the eye refractive power continuously measured in the left eye and the right eye. It is characterized by acquiring adjustment information.

1 is an external view of an ophthalmologic measurement apparatus; FIG. It is a figure which shows the structure of a measurement part. FIG. 2 is a schematic configuration diagram of the inside of the ophthalmologic measurement apparatus viewed from the front. FIG. 2 is a schematic configuration diagram of the inside of the ophthalmologic measurement apparatus as viewed from the side; FIG. 2 is a schematic configuration diagram of the inside of the ophthalmologic measurement apparatus viewed from above; It is a figure which shows the control system of an ophthalmologic measuring apparatus. It is an example of a fixation target displayed on the display. It is an example of an anterior segment observed image of the left eye. This is an example of a case where the fixation target has an attention target and a background target.

<Overview>
An outline of an ophthalmologic measurement 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.

In addition, in this embodiment, "same" includes "substantially the same". In addition, "coaxial" includes "substantially coaxial". In addition, "simultaneously" includes "substantially simultaneously". Also, "match" includes "substantially match". In addition, "conjugated" includes "substantially conjugated".

The ophthalmologic measurement apparatus according to this embodiment objectively measures the optical characteristics of an eye to be examined. The ophthalmologic measurement apparatus may comprise objective measurement means for objectively measuring the optical properties of the eye to be examined. At least one of eye refractive power (spherical power, cylindrical power, astigmatism axis angle, etc.), axial length, corneal shape, etc. may be measured as the optical characteristics of the eye to be examined. The ophthalmologic measurement apparatus may include, in addition to the objective measurement means, subjective measurement means for subjectively measuring the optical characteristics of the subject's eye. In this case, the optical characteristics of the eye to be examined include eye refractive power (spherical power, cylindrical power, astigmatic axis angle, etc.), contrast sensitivity, binocular vision function (for example, amount of oblique vision, stereoscopic vision function, etc.), etc. At least one of them may be measured.

<Fixation target presenting means>
The ophthalmologic measurement apparatus includes a fixation target presenting means. The fixation target presenting means presents the fixation target to the left eye and right eye of the subject. Further, the fixation target presenting means may present a fixation target having parallax set by a parallax setting means described below to the left eye and the right eye.

A display means (for example, the display 31) may be used as the fixation target presenting means. The display means may be a display, and examples thereof include LCOS (Liquid crystal on silicon), LCD (Liquid Crystal Display), and organic EL (Electro Luminescence). In this case, the fixation target displayed on the fixation target presenting means (display means) can be presented to the left eye and right eye of the subject. The fixation target may be at least one of a point image target, a landscape target, and the like.

In this embodiment, the fixation target presenting means may present the fixation target to the left eye and the right eye at the same time. For example, the fixation target presenting means includes left eye fixation target presenting means for presenting the fixation target to the left eye and right eye fixation target presenting means for presenting the fixation target to the right eye. , may also be used. In this case, the fixation target presenting area for presenting the fixation target in the fixation target presenting means is a fixation target presenting area for presenting the fixation target for the left eye and the fixation target for presenting the fixation target for the right eye. and a fixation target presenting region for displaying the target. Further, for example, the fixation target presenting means may include a left eye fixation target presenting means and a right eye fixation target presenting means. In this case, the left eye fixation target presenting means and the right eye fixation target presenting means may be provided as a pair on the left and right.

<Presentation distance changing means>
The ophthalmologic measurement apparatus includes presentation distance changing means (for example, control unit 70). The presentation distance changing means changes the presentation distance of the fixation target to the left eye and right eye of the subject. In other words, the presentation distance changing means changes the optical inspection distance of the fixation target for the left eye and right eye of the subject. For example, the presentation distance changing means changes the presentation distance of the fixation target for the left eye and the presentation distance of the fixation target for the right eye to be the same presentation distance (same optical examination distance). may

In this embodiment, the presentation distance changing means may change the presentation distance of the fixation target to the left eye and right eye of the subject to any two or more distances. In this case, the two or more presentation distances may be selected from a distance presentation distance, an intermediate presentation distance, a near presentation distance, and the like. Also, the two or more presentation distances may be different presentation distances in the far presentation distance (or the intermediate presentation distance, the near presentation distance, etc.). Of course, two or more presentation distances may be combinations of these. As an example, there may be three presentation distances, 5 m as a far-use presentation distance and 40 cm and 20 cm as near-use presentation distances.

The presentation distance changing means changes the presentation distance of the fixation target to the left and right eyes of the subject by controlling a driving means (for example, driving mechanism 39) for moving the fixation target presenting means. You may let For example, in this case, the presentation distance of the fixation target may be changed by moving the fixation target presenting means in the optical axis direction. Further, the presentation distance changing means controls the driving means for inserting and removing the optical member in the optical path of the fixation target presenting means to change the presentation distance of the fixation target to the left and right eyes of the subject. You can change it. For example, in this case, the presentation distance of the fixation target may be changed by inserting or removing at least one optical member such as a lens, a prism, or a mirror in the optical path of the fixation target presentation means. Note that the presentation distance changing means is not limited to the configuration of changing the presentation distance of the fixation target by moving or inserting/removing the fixation target presentation means, and may have a different configuration. For example, a light field display may be used as the fixation target presenting means, and the presentation distance changing means may change the presentation distance of the object (here, the fixation target) reproduced by the light field display.

In this embodiment, the presentation distance changing means may continuously change the presentation distance of the fixation target to the left eye and right eye of the subject. For example, the presentation distance changing means may gradually change the presentation distances of the fixation target for the left eye and the right eye. Further, for example, the presentation distance changing means may change the presentation distances of the fixation target for the left eye and the right eye at intervals of a predetermined presentation distance. As an example, the presentation distance of the fixation target may be changed by a diopter interval corresponding to a predetermined presentation distance.

In this embodiment, the presentation distance changing means may stop such continuous change of the presentation distance based on the eye position information acquired by the eye position information acquiring means described later. At this time, even if the continuous change in the presentation distances to the left and right eyes of the subject is stopped, the measurement of the optical characteristics of the left and right eyes by the objective measurement means described later may be continued. good. At this time, even if the measurement of the optical characteristics of the left eye and the right eye by the objective measurement means described later is terminated as the continuous change in the presentation distance to the left eye and right eye of the subject stops. good.

<Means for changing presentation position>
The ophthalmologic measurement apparatus includes presentation position changing means (for example, control unit 70). The presentation position changing means changes the presentation position of the fixation target with respect to the left eye and right eye of the subject. In this embodiment, the presentation position changing means changes the presentation position of the fixation target on the display screen of the fixation target presentation means for the left eye and the right eye of the subject.

The presentation position changing means presents the fixation target at a presentation position corresponding to the presentation distance of the fixation target changed by the presentation distance changing means, the presentation position enabling binocular fusion by the left eye and the right eye. You can change the position. That is, the presentation position changing means controls the fixation target presentation means to present the fixation target to the left eye and the right eye at a presentation position where binocular fusion is possible corresponding to the presentation distance of the fixation target. Each may be presented.

In this embodiment, the presentation position changing means controls the display of the fixation target presentation means in accordance with the presentation distance of the fixation target to the left and right eyes of the subject, thereby increasing the size of the fixation target. can be changed. At this time, the presentation position changing means may change the size of the fixation target in consideration of changes in the visual angles of the left and right eyes according to the presentation distance of the fixation target to the left and right eyes. good.

Further, in the present embodiment, the presentation position changing means controls the display of the fixation target presentation means in accordance with the presentation distance of the fixation target to the left eye and right eye of the subject. position can be moved. At this time, the presentation position changing means may change the position of the fixation target in consideration of the change in the convergence angle of the left eye and the right eye according to the presentation distance of the fixation target to the left eye and the right eye. good.

The presentation position changing means changes either the size of the fixation target or the position of the fixation target on the display screen of the fixation target presentation means in correspondence with the presentation distance of the fixation target to the left eye and the right eye. may be changed. Of course, the presentation position changing means changes the size and position of the fixation target on the display screen of the fixation target presentation means in correspondence with the presentation distance of the fixation target to the left and right eyes. Both can be changed.

When the presentation distance changing means continuously changes the presentation distance of the fixation target with respect to the left and right eyes of the subject, the presentation position changing means changes the presentation distance of the fixation target continuously. Based on this, the presentation position of the fixation target corresponding to the presentation distance of the fixation target may be continuously changed. That is, the presentation position changing means gradually enlarges or reduces the size of the fixation target, or changes the position of the fixation target, in accordance with the continuous change in the presentation distance of the fixation target to the left eye and the right eye. may be controlled to gradually move the .

When the presentation distance of the fixation target continuously changes, the presentation position changing means may change the presentation position of the fixation target in accordance with an arbitrary presentation distance interval of the fixation target. In this case, the presentation position of the fixation target may be associated with each presentation distance of the fixation target. Further, in this case, the presentation position of the fixation target may be associated with each fixed presentation distance of the fixation target. For example, the presentation position of the fixation target may be changed every time the presentation distance of the fixation target changes by 5 cm.

<Objective measuring means>
The ophthalmologic measuring device comprises objective measuring means. The objective measurement means includes an objective measurement optical system (for example, the objective measurement optical system 10). The objective measurement optical system may include a projection optical system (for example, projection optical system 10a). The projection optical system projects a measurement light beam toward the fundus of the subject's eye (at least one of the left eye and the right eye). Also, the objective measurement optical system may include a light receiving optical system (for example, the light receiving optical system 10b). The light-receiving optical system receives a fundus-reflected light flux that is the measurement light flux reflected by the fundus of the subject's eye (at least one of the left eye and the right eye). In other words, the objective measurement optical system consists of a light projecting optical system that projects a measurement light beam toward the fundus of the eye to be inspected, and a light receiving optical system that receives the fundus reflection light beam that is the measurement light beam reflected by the fundus of the eye to be inspected. and may be provided.

As an example, the objective measurement optical system projects a spot-shaped measurement light flux onto the fundus through the center of the pupil of the eye to be inspected, and extracts a ring-shaped fundus reflection light flux through the periphery of the pupil of the eye to be inspected. Alternatively, a ring-shaped fundus reflected image may be captured by the imaging element. As an example, the objective measurement optical system projects a spot-shaped measurement light beam onto the fundus through the peripheral portion of the pupil of the eye to be examined, and transforms the fundus reflection light into a ring shape through the center of the pupil of the eye to be examined. A configuration may also be adopted in which a ring-shaped fundus reflected image is captured by an imaging element by taking out the lens. Further, as an example, the objective measurement optical system may be configured to include a beam deflection means (for example, the prism 15). Further, as an example, the objective measurement optical system may be configured to include a Shack-Hartmann sensor. Further, as an example, the objective measurement optical system may be configured to have a phase difference method for projecting a slit onto the subject's eye.

In this embodiment, the objective measurement means measures a plurality of optical characteristics for the subject's eye (at least one of the left eye and the right eye), and at least changes in the presentation distance of the fixation target are started. may be measured after For example, the objective measurement means may measure the optical characteristics of the subject's eye at any two or more presentation distances after the start of changing the presentation distance of the fixation target. In this case, the timing for measuring the optical characteristics may be any one of when the presentation distance starts changing, when the presentation distance changes, and when the presentation distance ends changing.

Further, for example, the objective measurement means continuously measures the optical characteristics of the subject's eye (at least one of the left eye and the right eye) at least after starting to change the presentation distance of the fixation target. may In this case, the objective measurement means may continuously measure the optical characteristics during the change of the presentation distance including the start and end of the change of the presentation distance. In this case, the objective measurement means may continuously measure the optical characteristics during the change of the presentation distance, excluding the start and end of the change of the presentation distance.

Of course, in this embodiment, the objective measurement means measures the optical characteristics of the subject's eye (at least one of the left eye and right eye) before starting to change the presentation distance of the fixation target. may That is, the objective measurement means starts measuring the optical characteristics of the subject's eye before the start of changing the presentation distance of the fixation target, and after the start of changing the presentation distance of the fixation target. Measurement may continue. Further, the objective measurement means does not measure the optical characteristics of the subject's eye before the start of changing the presentation distance of the fixation target, and measures the optical characteristics after the start of changing the presentation distance of the fixation target. You can start measuring.

In this embodiment, the objective measurement means continuously measures the optical characteristics of the subject's eye (at least one of the left eye and the right eye) based on the eye position information acquired by the eye position information acquiring means described later. Measurement may be terminated. Of course, as described above, when the presentation distance changing means stops the continuous change of the presentation distance based on the eye position information, the left Continuous optical property measurements for the eye and the right eye may be terminated.

<Convergence angle changing means>
The ophthalmologic measurement apparatus includes convergence angle changing means (for example, control unit 70). The convergence angle changing means changes the convergence angles of the subject's left eye and right eye based on the presentation distance. For example, the convergence angle changing means can change the convergence angle by controlling the display of the fixation target presenting means. More specifically, the convergence angle can be changed by changing the position of the fixation target displayed on the fixation target presenting means.

Further, for example, the convergence angle changing means can change the convergence angle by controlling the driving of the deflecting optical member that deflects the optical axis of the objective measuring means. For example, in the present embodiment, the convergence angle can be changed by controlling the rotation of the deflecting optical member (for example, deflecting mirror 81) included in the objective measuring means. In addition, the convergence angle changing means may change the convergence angle by inserting and removing a deflection optical member in the optical path of the objective measuring means. A prism or a mirror may be used as the deflecting optical member.

In this embodiment, the convergence angle changing means controls at least one of the display of the fixation target presenting means and the driving of the deflection optical member according to the presentation distance of the fixation target to the left eye and right eye. Thus, the convergence angles of the left eye and right eye can be changed based on the presentation distance of the fixation target. For example, in this case, the convergence angle changing means controls the display of the fixation target presenting means or the driving of the deflection optical member according to the presentation distance of the fixation target to the left eye and the right eye. Alternatively, it may be determined whether to control the display of the fixation target presenting means and to control the driving of the deflection optical member.

<Parallax Setting Means>
The ophthalmologic measurement apparatus includes parallax setting means (for example, control unit 70). The parallax setting means sets a parallax for the fixation target based on the presentation distance of the fixation target. That is, the parallax setting means may set a parallax amount such that the fixation target presented to the left eye and the right eye rises or sinks based on the presentation distance. When the fixation target presented to the left eye and right eye is composed of multiple fixation targets (for example, a landscape target having a target of interest and a background target, etc.), the plurality of fixation targets may be used. A parallax amount may be set for each visual target. This makes it possible to present a more realistic fixation target with a three-dimensional effect to the left and right eyes. For example, the parallax setting means may set the amount of parallax based on the presentation distance of the fixation target for the left eye and the right eye and the interpupillary distance of the left eye and the right eye.

<Eye Position Information Acquisition Means>
The ophthalmologic measurement apparatus includes eye position information acquisition means (for example, 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. In this embodiment, the eye position information may be any information that can represent the line-of-sight directions of the left eye and the right eye. For example, it may be information indicating the positions of the characteristic parts of the left eye and the right eye. Further, for example, the information may be information indicating the deviation amount 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 for the left eye and right eye may be obtained based on the anterior segment images of the left eye and right eye. 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 and the position of the outer peripheral edge of the pupil 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.

<Output means>
The ophthalmologic measurement device comprises output means. The output means outputs guidance information for guiding the stop of the continuous change of the presentation distance by the presentation distance change means based on the eye position information acquired by the eye position information acquisition means. In the present embodiment, the guidance information may be any information that allows the examiner to stop the continuous change of the presentation distance. For example, the guidance information may be eye position information itself. Further, for example, the guidance information may be information indicating the motion of the examiner.

The output means outputs the guidance information by display on the display means (for example, the monitor 6a), output by generating voice guidance, output by saving in a memory or server, etc., output by printing on a printer, etc. At least You may output by either. By outputting the guidance information, the examiner can grasp the fusional state of the eye to be examined and easily perform appropriate instructions and operations.

<Adjustment Information Acquisition Means>
The ophthalmologic measurement apparatus includes adjustment information acquisition means (for example, control unit 70). The adjustment information acquiring means acquires adjustment information regarding the adjustment function of the subject's eye (at least one of the left eye and the right eye). The adjustment information of the eye to be inspected may be any information that allows comparison of a plurality of optical characteristics of the eye to be inspected. For example, the accommodation information may be a plurality of optical properties of the subject's eye. In this case, information in which a plurality of optical characteristics are arranged, information in which a plurality of optical characteristics can be switched and displayed, information in which at least part of a plurality of optical characteristics are superimposed, or the like may be used. Further, for example, the adjustment information may be information obtained by differentially processing a plurality of optical characteristics of the subject's eye. In this case, information indicating the accommodation power of the eye to be examined, information indicating the accommodation state of the eye to be examined (for example, whether or not the eye is in the accommodation state, how the accommodation state has changed, etc.), etc. good. Of course, these pieces of information may be used together as the adjustment information.

The adjustment information acquiring means only needs to be able to acquire adjustment information based on a plurality of optical properties measured for the subject's eye (at least one of the left eye and the right eye). For example, it is sufficient if the adjustment information can be obtained based on changes in the respective optical properties measured at two or more presentation distances of the fixation target with respect to the subject's eye. As an example, when the fixation target is changed to three presentation distances by the presentation distance changing means, each optical property measured at any two presentation distances, or each optical property measured at all presentation distances Adjustment information may be obtained based on the characteristics. Of course, after the start of the continuous change of the fixation target for the eye to be examined (at least one of the left eye and the right eye), the adjustment information is based on the change over time of each optical characteristic continuously measured. may be obtained.

For example, the adjustment information acquiring means may acquire the adjustment information by differentially processing a plurality of optical characteristics of the subject's eye. In this case, from at least one of the difference of the captured images used for calculating the plurality of optical characteristics, the difference of the parameters of the plurality of optical characteristics (numerical values such as spherical power value, cylindrical power value, astigmatic axis angle value, etc.) Adjustment information may be obtained.

<Example>
An example of an ophthalmologic measurement apparatus according to this embodiment will be described.

FIG. 1 is an external view of an ophthalmologic measurement apparatus. For example, the ophthalmologic measurement apparatus 1 includes a housing 2, a presentation window 3, a forehead rest 4, a chin rest 5, a controller 6, 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 ophthalmic measurement apparatus 1 constant. The chin rest 5 is used to keep the distance between the subject's eye E and the ophthalmologic measuring 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.

<Measuring unit>
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.

A light source 11 emits a measurement light beam. The light source 11 has a conjugate relationship with the fundus of the eye E to be examined. A hole portion of the hole mirror 13 is in a conjugate relationship with the pupil of the eye E to be examined. Prism 15 is a beam deflection member. The prism 15 is arranged at a position away from the position conjugated to the pupil of the subject's eye E, and decenters the measurement light flux passing through the prism 15 with respect to the optical axis L1. The prism 15 is rotationally driven by a driving section (motor) 23 about the optical axis L1.

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.

The ring lens 20 is composed of a ring-shaped lens portion and a light shielding portion having a light shielding coating applied to a region other than the lens portion. The ring lens 20 has an optically conjugate positional relationship with the pupil of the eye E to be examined. The light receiving diaphragm 18 and the imaging device 22 are in a conjugate relationship with the fundus of the eye E to be examined. An output from the imaging element 22 is input to the control section 70 .

In the above configuration, the measurement light flux emitted from the light source 11 passes through the relay lens 12, the hole mirror 13, and the optical members from the prism 15 to the dichroic mirror 29 in order, and forms a spot on the fundus of the eye E to be examined. A point light source image is formed. At this time, the prism 15 that rotates around the optical axis eccentrically rotates the pupil projected image of the hole portion in the hole mirror 13 (projected light flux on the pupil) at high speed. The point light source image projected on the fundus is reflected/scattered and emitted from the eye E to be examined, reflected by the dichroic mirror 29 and the dichroic mirror 35, condensed by the objective lens 102, and rotated at high speed by the prism 15 and the hole mirror 13. , the relay lens 16, and the mirror 17, the light is converged again on the light receiving diaphragm 18, and formed as a ring-shaped image on the image sensor 22 by the collimator lens 19 and the ring lens 20. FIG.

In this embodiment, the prism 15 is arranged on the common optical axis of the projection optical system 10a and the light receiving optical system 10b. For example, the measurement light flux from the projection optical system 10a passes through the prism 15 and enters the eye E to be examined, and the fundus reflected light flux reflected by the fundus of the eye E to be examined passes through the same prism 15. , reverse scanning is performed as if there was no eccentricity of the projected light flux and the fundus reflected light flux (received light flux) on the pupil.

<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 display 31 provided in the projection optical system 30, the light source 11 and the relay lens 12 provided in the projection optical system 10a, the light receiving diaphragm 18 provided in the light receiving optical system 10b, the collimator lens 19, the ring lens 20, and the imaging The element 22 and are integrally movable in the optical axis direction by a drive mechanism 39 . In other words, 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 driving unit 95, and are integrally moved by the driving 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.

Further, the drive mechanism 39 moves the light source 11, the relay lens 12, and the light receiving diaphragm 18 to the imaging element 22 in the optical axis L1 direction by moving the drive unit 95 in the optical axis direction. Thereby, the light source 11, the light receiving diaphragm 18, and the imaging device 22 are arranged so as to be optically conjugate with respect to the fundus of the eye E to be examined. Regardless of the movement of the drive unit 95, the hole mirror 13 and the ring lens 20 are arranged so as to be conjugate with the pupil of the subject's eye E at a constant magnification. For this reason, the fundus reflected light flux, which is the measurement light flux reflected by the projection optical system 10a, always enters the ring lens 20 of the light receiving optical system 10b as a parallel light flux. Ring-shaped luminous fluxes of the same size are imaged by the imaging device 22 in a focused state.

<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, an image of the anterior segment of the subject's eye E is picked up by the imaging device 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 Ophthalmic Measuring Apparatus>
The internal configuration of the ophthalmologic measurement apparatus 1 will be described. FIG. 3 is a schematic configuration diagram of the inside of the ophthalmologic measurement apparatus 1 as viewed from the front. FIG. 4 is a schematic configuration diagram of the inside of the ophthalmologic measurement apparatus 1 as viewed from the side. FIG. 5 is a schematic configuration diagram of the inside of the ophthalmologic measurement apparatus 1 as viewed from above. 4 and 5 show only the optical axis of the left eye measuring section 7L for convenience of explanation.

The ophthalmologic measurement apparatus 1 includes an objective measurement section and a subjective measurement section. In the objective measurement section and the subjective measurement section, the measurement light flux and target light flux (hereinafter referred to as light flux) from the measurement section 7 pass through an optical path deviated from the optical axis L of the concave mirror 85 described later, The light is guided to the eye E to be examined. That is, the light flux from the measurement unit 7 is irradiated from a direction oblique to the optical axis L of the concave mirror 85, and the reflected light flux is guided to the eye E to be examined. For example, the optical axis L is an axis directed toward the spherical center of the concave mirror 85 . In this embodiment, the light beam from the measurement unit 7 passes through an optical path deviated from the optical axis L of the concave mirror 85. They may pass through matching optical paths.

For example, the objective measuring section is composed of the measuring section 7, the deflecting mirror 81, the reflecting mirror 84, the concave mirror 85, and the like. Note that the objective measurement unit is not limited to this configuration. For example, a configuration without the reflecting mirror 84 may be used. In this case, the measurement 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 measurement light flux from the measurement unit 7 may be irradiated obliquely with respect to the optical axis L of the concave mirror 85 via a half mirror, and the reflected light flux may be guided to the eye E to be examined.

For example, the subjective measurement unit is composed of the measurement unit 7, deflection mirror 81, drive mechanism 82, drive unit 83, reflection 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 ophthalmologic measurement apparatus 1 has a left-eye drive unit 9L and a right-eye drive unit 9R, and moves the left-eye measurement unit 7L and the right-eye measurement unit 7R in the X direction, respectively. can be done. 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 driving 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.

For example, the concave mirror 85 is used by both the objective measurement section and the subjective measurement section. For example, the measurement light flux projected from the objective measurement optical system 10 is projected onto the subject's eye E via the concave mirror 85 . Further, for example, the reflected light of the measurement light flux projected from the objective measurement optical system 10 is guided to the light receiving optical system 10 b of the objective measurement optical system 10 via the concave mirror 85 . In this embodiment, the measurement light beam reflected by the objective measurement optical system 10 is guided to the light receiving optical system 10b of the objective measurement optical system 10 via the concave mirror 85 as an example. , but not limited to this. For example, the measurement light beam reflected by the objective measurement optical system 10 may be configured not to pass through the concave mirror 85 . For example, the target light flux projected from the subjective measurement optical system 25 is projected onto the subject's eye E via the concave mirror 85 .

More specifically, for example, in this embodiment, the optical axis between the concave mirror 85 and the subject's eye E in the objective measurement unit and the optical axis between the concave mirror 85 and the subject's eye E in the subjective measurement unit and are at least coaxial with the optical axis. For example, in this embodiment, the dichroic mirror 35 synthesizes the optical axis L1 of the objective measurement optical system 10 and the optical axis L2 of the subjective measurement optical system 25 so that they are coaxial.

<Optical path of the objective measurement unit>
The optical path of the objective 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 objective measurement unit for the left eye, the measurement light beam emitted from the light source 11 of the projection optical system 10a in the objective measurement optical system 10 passes from the relay lens 12 to the dichroic mirror 29, and passes through the left eye measurement unit. The image is projected from the portion 7L toward the left-eye deflection mirror 81L. The measurement light beam reflected by the deflection mirror 81 for the left eye is reflected by the reflection mirror 84 toward the concave mirror 85 . The measurement light beam reflected by the concave mirror passes through the reflecting mirror 84 and reaches the left eye EL, forming a spot-like point light source image on the fundus of the left eye EL. At this time, the prism 15 that rotates around the optical axis eccentrically rotates the pupil projected image (projected light flux on the pupil) of the hole portion of the hole mirror 13 at high speed.

The light of the point light source image formed on the fundus of the left eye EL is reflected and scattered, exits the eye to be examined E, and is reflected by the dichroic mirror 29 and the dichroic mirror 35 via the optical path through which the measurement light beam has passed. , and condensed by the objective lens 102 , the light passes through the prism 15 , the hole mirror 13 , the relay lens 16 and the mirror 17 . Reflected light passing up to the mirror 17 is condensed again on the opening of the light receiving diaphragm 18, converted into a substantially parallel light beam (in the case of a normal eye) by the collimator lens 19, and taken out as a ring-shaped light beam by the ring lens 20. The image is picked up by the imaging device 22 as a ring image. By analyzing the captured ring image, the optical characteristics of the subject's eye E can be measured objectively.

<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 light beam 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 way.

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 image of the target light flux formed in front of the eye at a predetermined examination distance optically via the concave mirror 85 .

<Control unit>
FIG. 6 is a diagram showing a control system of the ophthalmologic measurement apparatus 1. As shown in FIG. For example, the control unit 70 is electrically connected to various members such as the monitor 6a, the nonvolatile memory 75 (hereinafter referred to as the memory 75), the light source 11 provided in the measurement unit 7, the imaging device 22, the display 31, the imaging device 52, and the like. 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 ophthalmologic measurement apparatus 1 . For example, RAM temporarily stores various information. For example, the ROM stores various programs, targets, initial values, etc. for controlling the operation of the ophthalmologic measurement 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 action>
A control operation of the ophthalmologic measurement apparatus 1 will be described.

In this embodiment, the controller 70 sets either the first measurement mode or the second measurement mode based on the operation of the switch section 6b by the examiner. For example, in the first measurement mode, the fixation target is set at a predetermined presentation distance (for example, distance presentation distance, near presentation distance, etc.) with respect to the eye E to be examined, and objective optical This is the mode for measuring characteristics. For example, the second measurement mode is a mode in which the objective optical characteristics of the eye E are continuously measured by setting the presentation distance of the fixation target to the eye E to be continuously changed. .

<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 provided in each of the left-eye measurement unit 7L and the right-eye measurement unit 7R to display a fixation target in response to an input signal from the switch unit 6b. By projecting the optotype light flux from the display 31 onto the subject's eye E (the left eye EL and the right eye ER), an image of the fixation target is presented in front of the eye.

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 by the first index projection optical system 45 and the second index projection optical system 46 onto the cornea of the left eye EL according to the input signal from the switch unit 6b. Further, the control unit 70 uses the alignment index image to detect deviations in the X, Y, and Z directions of the left eye measurement unit 7L with respect to the left eye EL, and based on these deviations, performs left eye measurement. Move the part 7L. Similarly, the control unit 70 projects an alignment index image onto the cornea of the right eye ER in response to an input signal from the switch unit 6b, and uses the alignment index image to apply the right eye measuring unit to the right eye ER. Move 7R. This completes the alignment.

<Measurement of optical characteristics in the first mode>
When the alignment of the measurement unit 7 with respect to the eye E to be examined is completed, the examiner operates the switch unit 6b to set the first mode. For example, it is set to measure the objective optical characteristics (objective value) of the subject's eye E when a fixation target is presented to the subject's eye E at a distance presentation distance. Further, the examiner operates the switch section 6b to simultaneously start the measurement of the distance objective values of the left eye EL and the right eye ER.

First, the control unit 70 performs preliminary measurement of objective values for each of the left eye EL and right eye ER, moves the display 31 in the direction of the optical axis L2 according to the results of the preliminary measurement, and Cloud mist is applied to the right eye ER. That is, the control unit 70 once moves the display 31 to a position where the left eye EL and the right eye ER are in focus, and then moves the display 31 to a position where an appropriate amount of fog is obtained. cloud over

Subsequently, the control unit 70 performs final measurement of the objective values for the left eye EL and the right eye ER, illuminates the fundus of each of the left eye EL and the right eye ER, and reflects the light from the fundus. The fundus reflected light flux of the measured light flux is captured by the imaging element 22 as a ring image. The control unit 70 analyzes the ring image to obtain the eye refractive power in each meridian direction, and performs predetermined processing on the eye refractive power to acquire the objective values of the left eye EL and the right eye ER. and store it in the memory 75 .

<Measurement of optical properties in second mode>
When the examiner acquires the distance objective value of the eye to be examined E, the examiner operates the switch section 6b to set the second mode. Based on the distance objective values of the left eye EL and right eye ER, the control unit 70 controls the projection optical system 30 and the correction optical system 60 in each of the left eye measurement unit 7L and the right eye measurement unit 7R. Control at least one. For example, the control unit 70 may move the display 31 in the direction of the optical axis L2 to correct the spherical powers of the left eye EL and the right eye ER. Further, for example, the control unit 70 may rotate the cylindrical lenses 61a and 61b around the optical axis L2 to correct the cylindrical powers and the astigmatism axis angles of the left eye EL and the right eye ER. As a result, the eye refractive power of the left eye EL and the eye refractive power of the right eye ER are corrected to a predetermined correction power (for example, 0D).

The examiner corrects the ocular refractive powers of the left eye EL and the right eye ER to a predetermined correction power, and further measures the subjective optical characteristics (subjective value) of the subject's eye E to obtain the left eye EL and the correction state of the right eye ER may be finely adjusted. The control unit 70 acquires the subjective values for distance use of the left eye EL and the right eye ER, and stores them in the memory 75 . In this case, instead of the objective values for the distance vision of the left eye EL and the right eye ER, the subjective values of the distance vision of the left eye EL and the right eye ER are used for continuous objective value measurement, which will be described later. may

<Measurement of continuous objective value based on presentation distance of fixation target>
The examiner acquires the distance objective value of the eye to be examined E, operates the switch part 6b in a state in which the ocular refraction of the eye to be examined E is corrected, and continuously shifts the left eye EL and the right eye ER. Simultaneously start the measurement of the acuity value. The control unit 70 controls driving of the driving mechanism 39 in the left eye measurement unit 7L and the right eye measurement unit 7R according to the input signal from the switch unit 6b, and controls the display 31L of the left eye measurement unit 7L and the right eye measurement unit 7R. The display 31R of the eye measurement unit 7R is moved in the direction of the optical axis L1 and placed at the initial position. For example, a position farther by a distance corresponding to +0.5D than the presentation distance corresponding to the far objective value of the left eye EL and right eye ER (that is, the far point of the left eye EL and right eye ER) is the initial position, the display 31L and the display 31R are arranged.

Further, the control unit 70 controls driving of the drive mechanism 39 in each of the left eye measurement unit 7L and the right eye measurement unit 7R, and gradually moves the display 31L and the display 31R from the initial position to the near position. close to As a result, the fixation targets displayed on the displays 31L and 31R are presented to the left eye EL and the right eye ER so as to gradually move from far to near. That is, the presentation distance of the fixation target gradually changes from the distance presentation distance to the near presentation distance for the left eye EL and the right eye ER. At this time, the control unit 70 presents the fixation target to the left eye EL and the right eye ER without any sense of discomfort, and allows the left eye EL and the right eye ER to observe the fixation target in a natural state. The following control is performed based on the target presentation distance.

<Display of fixation target>
FIG. 7 shows an example of a fixation target 200L displayed on the display 31L and a fixation target 200R displayed on the display 31R. FIG. 7A shows a fixation target 200L and a fixation target 200R when the display 31 is arranged at a position corresponding to the distance presentation distance. FIG. 7B shows the fixation target 200L and the fixation target 200R when the display 31 is arranged at a position corresponding to the near presentation distance.

The control unit 70 changes the apparent sizes of the fixation target 200L and the fixation target 200R displayed on the displays 31L and 31R in accordance with the presentation distance of the fixation target with respect to the left eye EL and right eye ER.

For example, when the fixation target is presented to the left eye EL and the right eye ER at the distance presentation distance, the apparent sizes of the fixation target 200L and the fixation target 200R are reduced. Further, for example, when the fixation target is presented to the left eye EL and the right eye ER at the near presentation distance, the apparent sizes of the fixation target 200L and the fixation target 200R are increased. That is, the farther the presentation distance of the fixation target is from the left eye EL and the right eye ER (the longer the presentation distance of the fixation target is), the smaller the apparent sizes of the fixation targets 200L and 200R are. The closer the presentation distance of the fixation target is changed (the shorter the presentation distance of the fixation target is), the larger the apparent size of the fixation target 200L and the fixation target 200R changes.

Note that the control unit 70 changes the visual angle of the left eye EL and the right eye ER according to the presentation distance of the fixation target with respect to the left eye EL and the right eye ER, and displays the fixation target 200L and the fixation target 200R in association with the change in visual angle. may vary in apparent size. For example, in this case, for each presentation distance of the fixation target, the apparent size of the fixation target based on the presentation distance and visual angle may be obtained in advance from experiments, simulations, or the like.

Further, the control unit 70 changes the positions of the fixation target 200L and the fixation target 200R displayed on the display 31L and the display 31R in correspondence with the presentation distance of the fixation target with respect to the left eye EL and right eye ER.

For example, when the fixation target is presented to the left eye EL and the right eye ER at the distance presentation distance, the fixation target 200L and the fixation target 200R are positioned near the center of the display screens of the displays 31L and 31R. is changed to Further, for example, when the fixation target is presented to the left eye EL and the right eye ER at the near presentation distance, the fixation target 200L is displayed on the right side of the display screen of the display 31L, and the fixation target 200R is displayed on the display 31R. They are changed so that they are located on the left side of the screen. That is, the longer the presentation distance of the fixation target with respect to the left eye EL and the right eye ER, the more the fixation target 200L and the fixation target 200R are positioned at the center of the display screen of the display, and the presentation distance of the fixation target is The nearer is the fixation target 200L and the fixation target 200R are changed so as to be positioned closer to the inside of the display screen of the display. In other words, the fixation target 200L and the fixation target 200R move in the horizontal direction according to the presentation distance of the fixation target with respect to the left eye EL and right eye ER.

Note that the control unit 70 associates the change in the angle of convergence of the left eye EL and the right eye ER with the presentation distance of the fixation target with respect to the left eye EL and the right eye ER so as to correspond to the fixation target 200L and the fixation target 200L. The position of 200R may be changed. That is, the control unit 70 changes the convergence angle of the left eye EL and the right eye ER according to the presentation distance of the fixation target with respect to the left eye EL and the right eye ER, and displays the fixation target 200L and the fixation target. 200R may be set at a position where binocular fusion is possible. For example, in this case, for each presentation distance of the fixation target, the presentation distance, the interpupillary distance in the left eye EL and the right eye ER, and the distance from the corneal vertex position to the eyeball rotation point in the left eye EL and the right eye ER and the positions of the fixation target 200L and the fixation target 200R may be obtained in advance from experiments, simulations, or the like.

In this embodiment, the fixation target 200L and the fixation target 200R are moved in the horizontal direction in accordance with the presentation distance of the fixation target. And the fixation target 200R may be moved vertically. As an example, the fixation target 200L and the fixation target 200R may be moved in the up-down direction when considering the downward gaze of the left eye EL and the right eye ER. Of course, the fixation target 200L and the fixation target 200R may be moved in the horizontal direction and the vertical direction in association with the change in the convergence angle of the left eye EL and the right eye ER.

For example, by such control based on the presentation distance of the fixation target, a display area is set on the display screen of the display, and the fixation target is displayed in accordance with the display area. The control unit 70 displays the fixation target 200L within the display area 100L set according to the presentation distance of the fixation target 200L. The fixation target 200L is presented to the left eye EL at an appropriate apparent size and position in consideration of the viewing angle and convergence angle of the left eye EL for each presentation distance of the fixation target 200L. Further, the control unit 70 displays the fixation target 200R within the display area 100R set according to the presentation distance of the fixation target 200R. The right eye ER is presented with the fixation target 200R at an appropriate apparent size and position in consideration of the visual angle and convergence angle of the right eye ER for each presentation distance of the fixation target 200R. As a result, when the presentation distance of the fixation target is gradually changed, the left eye EL and the right eye ER maintain a natural state in which the fixation target 200L and the fixation target 200R are fused together. 200 can continue to be observed.

Note that the control unit 70 may set the parallax for each of the fixation target 200L displayed on the display 31L and the fixation target 200R displayed on the display 31R in correspondence with the presentation distance of the fixation target 200. good. That is, the control unit 70 causes the fixation target 200L displayed on the display 31 and the fixation target 200R displayed on the display 31R to float (or sink) in correspondence with the presentation distance of the fixation target 200. You may give a three-dimensional effect to .

For example, when the fixation target is presented to the left eye EL and the right eye ER at the distance presentation distance, the parallax amount of the fixation target 200L and the fixation target 200R is set small. Further, for example, when the fixation target is presented to the left eye EL and the right eye ER at the near presentation distance, the amount of parallax between the fixation target 200L and the fixation target 200R is set large. That is, with respect to the left eye EL and the right eye ER, the farther the presentation distance of the fixation target is, the smaller the parallax amount is set, and the closer the presentation distance of the fixation target is, the larger the parallax amount is set. be. This allows the left eye EL and right eye ER to visually recognize a realistic fixation target.

<Stopping continuous objective value measurement based on the presentation distance of the fixation target>
The control unit 70 gradually moves the display 31L and the display 31R from the initial position at a constant speed, and controls the display of the display 31L and the display 31R, so that the left eye EL and the right eye ER are displayed at the presentation distance. The corresponding fixation target 200L and fixation target 200R are presented. Further, while the display 31L and the display 31R are gradually moved from the initial positions, the control unit 70 uses the projection optical system 10a and the light receiving optical system 10b to obtain objective values for each of the left eye EL and the right eye ER. , measured in real time. For example, while moving the display 31L and the display 31R, the control unit 70 measures the objective values of the left eye EL and the right eye ER at predetermined diopter intervals (for example, 0.5D intervals), and sequentially be memorized.

Note that the control unit 70 may measure the eye positions of the left eye EL and the right eye ER when presenting the fixation target 200L and the fixation target 200R corresponding to the presentation distance to the left eye EL and right eye ER. . For example, while the objective values of the left eye EL and the right eye ER are being measured, the corneas of the left eye EL and the right eye ER are exposed to the red light beams provided by the first index projection optical system 45 and the second index projection optical system 46 . A measurement light beam is irradiated from an external light source, and a corneal reflected light beam, which is the measurement light beam reflected by the cornea, is imaged as a bright point image by the imaging device 52 of the observation optical system 50 . The control unit 70 can measure the eye positions of the left eye EL and the right eye ER using this bright spot image.

FIG. 8 is an example of an anterior segment observed image 120L of the left eye EL. Since the anterior segment observed image of the right eye ER can be considered in the same way, the illustration is omitted here. An image of the left eye EL and a bright spot image 125 formed on the cornea of the left eye EL are captured as an anterior segment observation image 120 of the left eye EL on the imaging device 52 of the observation optical system 50 . The bright spot image 125 is composed of a ring index image R1 and a ring index image R2. The ring index image R1 appears by the infrared light source of the first index projection optical system 45. FIG. The ring index image R2 appears by the infrared light source of the second index projection optical system 46. FIG.

The control unit 70 analyzes the anterior segment observed image 120L and detects the pupil of the left eye EL and the bright spot image 125 . The control unit 70 may detect the pupil center position P by detecting the pupil from the rise and fall of luminance and further calculating the center of the pupil. Further, the control unit 70 may detect the corneal vertex position K by detecting the bright point image 125 from the rise and fall of luminance and calculating the center of the ring index image R2. Of course, the control unit 70 may detect the corneal apex position K from the ring index image R1, or may detect the corneal apex position K from the ring index image R1 and the ring index image R2.

Next, the control unit 70 identifies the eye position of the left eye EL from the direction of the corneal vertex position K with respect to the pupillary center position P and the shift amount Δd of the corneal vertex position K with respect to the pupillary center position P. As the line-of-sight direction of the left eye EL deviates from the optical axis L3 of the observation optical system 50, the deviation amount Δd tends to increase. The control unit 70 moves the display 31L and the display 31R, and continuously measures the eye position of the left eye EL based on the presentation distance of the fixation target and the shift amount Δd.

Furthermore, the control unit 70 detects whether or not the left eye EL and the right eye ER are in a fused state based on the result of continuously measuring the eye position of the left eye EL and the eye position of the right eye ER. You may For example, the control unit 70 uses thresholds for the amount of deviation Δd of the left eye EL and the amount of deviation Δd of the right eye ER, which are set in advance for each presentation distance of the fixation target, to fuse the left eye EL and the right eye ER. It may be detected whether or not it is in the image state. In this case, the control unit 70 detects that the fusion state of the left eye EL and the right eye ER is canceled when the deviation amount Δd of the left eye EL and the deviation amount of the right eye ER exceed the threshold. good.

When the controller 70 detects that the fusion state of the left eye EL and the right eye ER has been canceled, the controller 70 stops moving the displays 31L and 31R. Further, when detecting that the fusion state of the left eye EL and the right eye ER has been canceled, the control unit 70 terminates continuous objective value measurement. As a result, the movement of the display 31 and the continuous measurement of the objective values are quickly completed in accordance with the accommodation forces acting on the left eye EL and the right eye ER.

<Acquisition of accommodation power of eye to be examined>
After the continuous measurement of the objective values of the left eye EL and the right eye ER, the control unit 70 adjusts the left eye EL and the right eye ER based on the objective values sequentially stored at predetermined diopter intervals. get power. For example, the control unit 70 presents the objective value obtained when the fixation target 200 is presented at the first presentation distance and the fixation target 200 at the second presentation distance to the left eye EL and the right eye ER. The accommodation power may be obtained from the difference between the objective value obtained at the time of

As an example, the control unit 70 may obtain the accommodation power from the difference between the distance objective value and the near objective value of the left eye EL and the right eye ER. The objective values for the near vision of the left eye EL and right eye ER are the objective values obtained at the presentation distance when the measurement of continuous objective values is completed (that is, the left eye EL and right eye ER periapsis) may be used. In other words, the objective values measured when the fusion state of the left eye EL and right eye ER is canceled may be used as the objective values for near vision of the left eye EL and right eye ER. The control unit 70 stores the accommodation powers of the left eye EL and the right eye ER in the memory 75 and displays them on the monitor 6a. Note that the control unit 70 controls the temporal change in the objective value obtained when the presentation distance of the fixation target 200 is continuously changed (that is, the objective value associated with the continuous change in the presentation distance). value fluctuation state) may be displayed on the monitor 6a as numerical values, graphs, or the like.

In the present embodiment, the control unit 70 determines the accommodation tension of the left eye EL and the right eye ER from the temporal changes in the objective values obtained when the fixation target 200 is presented with the presentation distance changed continuously. may be measured. In this case, the control unit 70 analyzes the ring images continuously captured by the imaging element 22 as the presentation distance of the fixation target 200 changes, and obtains the temporal change in refractive power.

In the accommodative strain measurement, it is necessary to sample the refraction power data at a short period of 0.1 seconds or less in order to calculate the appearance frequency (HFC) of the accommodative microtremor high frequency component from the change in the refraction power. For this reason, partial information of the ring image (for example, the horizontal meridian direction with reference to the center of the ring image) is used to detect two coordinates only in a specific direction, and from the distance, the refractive power in that direction is detected. This makes it possible to detect changes in refractive power over time at high speed, and to calculate HFC with sufficient accuracy. If the processing time is 0.1 seconds or less, detection in another direction such as the vertical direction may be added, but it is sufficient that the refractive power in at least one meridian direction is obtained.

Accommodative strain is then analyzed from changes in refractive power over time. A brief description of this analysis is provided. First, blinking of the subject's eye removes the refractive power data. Loss and disturbance of data due to blinking are corrected by a cubic spline function. Next, frequency analysis is performed using a fast Fourier transform (FFT) to obtain a power spectrum, which is then converted to common logarithms for analysis. Furthermore, an average power spectrum (unit: dB) in the section of high frequency components from 1.0 to 2.3 Hz is obtained from the power spectrum and evaluated as HFC.

For example, the control unit 70 may display the HFC on the monitor 6a together with the presentation distance of the fixation target 200, the refractive powers (accommodative reaction amounts) of the left eye EL and the right eye ER, and the like. As an example, the three elements of the presentation distance of the fixation target 200, the accommodation response amount, and the HFC may be graphically displayed as a three-dimensional graph using a color code map.

As described above, for example, the ophthalmologic measurement apparatus of this embodiment changes the presentation distance of the fixation target with respect to the left eye and the right eye of the subject, The target is changed to a presentation position where binocular fusion is possible for the left eye and the right eye, and for at least one of the left eye and the right eye, a plurality of optical characteristics are changed after the change of the presentation distance is started. Accommodative information is obtained regarding the accommodative function of the left eye and the right eye based on the visual measurements and the plurality of optical properties. As a result, when the subject performs binocular vision, an appropriate fixation target with little discomfort can be presented. In addition, the examiner can obtain highly accurate measurement results by allowing the examinee to visually recognize the fixation target in a state of natural vision.

Further, for example, the ophthalmologic measurement apparatus of the present embodiment continuously changes the presentation distance of the fixation target with respect to the left eye and the right eye, and changes the presentation position of the fixation target corresponding to the presentation distance of the fixation target. continuously changing the optical characteristics for at least one of the left eye and the right eye after the start of the change in the presentation distance of the fixation target, continuously measuring the continuously measured optical characteristics Based on this, the adjustment information is obtained. As a result, it is possible to accurately obtain the accommodative force when the subject visually recognizes the fixation target in a state of natural vision.

Further, for example, the ophthalmologic measurement apparatus of the present embodiment acquires eye position information regarding the eye positions of the left eye and right eye of the subject, and determines fixation targets for the left eye and right eye based on the eye position information. Stop continuous change of presentation distance. For example, when moving the presentation distance of the fixation target gradually or in steps to measure the accommodation power of the left eye and the right eye, it takes time from the start to the end of the measurement. However, considering whether or not binocular fusion is occurring based on the eye position information of the left and right eyes, the measurement time is shortened by ending the measurement of the objective value when the movement of the fixation target is stopped. and the load on the subject can be reduced.

Further, for example, the ophthalmologic measurement apparatus of this embodiment presents the fixation target with parallax set based on the presentation distance of the fixation target to the left eye and right eye of the subject. As a result, the left eye and the right eye can be presented with a more realistic target with a three-dimensional effect.

<transformation example>
In the present embodiment, the presenting distance of the fixation target with respect to the left eye EL and the right eye ER is described as an example of a configuration in which the presenting distance of the fixation target is continuously changed from the presenting distance for far-sightedness to the presenting distance for near-sightedness. is not limited to For example, the presenting distance of the fixation target for the left eye EL and the right eye ER may be configured to continuously change from the presenting distance for near use to the presenting distance for far use. Further, for example, the presentation distance of the fixation target for the left eye EL and the right eye ER is continuously changed from the distance presentation distance to the near presentation distance, and then from the near presentation distance to the far presentation distance. A configuration in which the presentation distance is continuously and repeatedly changed, such as continuously changing, may be employed. With these configurations as well, it is possible to measure the near vision objective values of the left eye EL and the right eye ER and obtain accommodation power.

In this embodiment, the configuration for continuously measuring the objective values of the left eye EL and the right eye ER was described as an example, but the present invention is not limited to this. In this embodiment, the objective values of the left eye EL and the right eye ER may be measured at a plurality of presentation distances. In this case, the display 31L and the display 31R may be moved at any time so as to have the respective presentation distances, and the objective values of the left eye EL and the right eye ER may be measured. Further, in this case, the display 31L and the display 31R may be continuously moved, and the objective values of the left eye EL and the right eye ER may be measured each time the respective presentation distances are reached.

For example, when measuring the left eye EL and right eye ER objective values at a plurality of presentation distances, the left eye EL and right eye ER objective values may be measured at at least two presentation distances. As an example, for the left eye EL and the right eye ER, the display 31L and the display 31R are changed to three presentation distances of a distance presentation distance, an intermediate presentation distance, and a near presentation distance. It may be measured by the presenting distance for near vision and the presenting distance for near vision. Thereby, the accommodation power of the left eye EL and the right eye ER may be obtained based on the objective value measured at the far presentation distance and the objective value measured at the near presentation distance. .

In this embodiment, when moving the positions of the fixation target 200L and the fixation target 200R associated with the change in the angle of convergence of the left eye EL and the right eye ER according to the presentation distance of the fixation target, Although the configuration for controlling the display on the displays 31L and 31R has been described as an example, the present invention is not limited to this. In this embodiment, when moving the positions of the fixation target 200L and the fixation target 200R corresponding to the change in the convergence angle of the left eye EL and the right eye ER according to the presentation distance of the fixation target, the deflection mirror It may be configured to control the rotation of 81L and deflection mirror 81R. In this case, the control unit 70 controls driving of the drive mechanism 82 according to the presentation distance of the fixation target, and rotates the deflection mirrors 81L and 81R. As a result, the fixation target 200L and the fixation target 200R can be apparently moved in the horizontal direction without moving the fixation target 200L and the fixation target 200R in the horizontal direction on the display screens of the displays 31L and 31R. can be done. That is, to the left eye EL, the fixation target 200L displayed on the display 31L appears to move in the horizontal direction according to the presentation distance of the fixation target. Also, to the right eye ER, the fixation target 200R displayed on the display 31R appears to move in the horizontal direction according to the presentation distance of the fixation target.

For example, in this embodiment, by performing at least one of the display control of the display 31 and the rotation control of the deflection mirror 81 according to the change in the convergence angle of the left eye EL and the right eye ER, The position of the fixation target may be moved. Further, for example, in this embodiment, display control of the display 31 and rotation control of the deflection mirror 81 are selectively used in accordance with changes in the convergence angles of the left eye EL and the right eye ER to move the position of the fixation target. good too. That is, the display control of the display 31 and the rotation control of the deflection mirror 81 may be selectively used according to the presentation distance of the fixation target to move the fixation target. As an example, when presenting the fixation target at the distance presentation distance, the display control of the display 31 moves the fixation target, and when presenting the fixation target at the near presentation distance, the deflection mirror 81 is moved. The fixation target may be moved by rotation control. For example, this makes it possible to appropriately perform optimal control so that the left eye EL and the right eye ER are likely to fuse together according to the presentation distance of the fixation target with respect to the left eye EL and the right eye ER. .

In this embodiment, the configuration in which the display 31 is moved at a constant speed from the initial position according to the presentation distance of the fixation target has been described as an example, but the present invention is not limited to this. In this embodiment, the moving speed of the display 31 (the moving speed of the fixation target) may be changed according to the presentation distance of the fixation target. For example, since the angle of convergence of the left eye EL and the right eye ER increases as the presentation distance of the fixation target approaches the near side, the left eye EL and the right eye ER cannot follow the movement speed of the fixation target, resulting in fusion. The image state may be canceled. Therefore, the control unit 70 may decrease the movement speed of the fixation target as the presentation distance of the fixation target approaches near. Note that the control unit 70 may control the moving speed of the fixation target based on the results of measuring the eye positions of the left eye EL and the right eye ER.

Further, in the present embodiment, a configuration in which the fixation target 200 changes based on changes in the apparent size and convergence angle of the left eye EL and right eye ER has been described as an example, but the present invention is not limited to this. For example, the fixation target 200 may be configured to move in any direction as time passes. As an example, the fixation target 200 may be moved alternately in the vertical direction as time passes. As a result, the fixation target 200 is presented to the left eye EL and the right eye ER while moving in the vertical direction. A target can be visually recognized.

In this embodiment, the fixation target 200 may be provided with points of gaze (points of gaze 300L and 300R shown in FIG. 7) for stabilizing the fixation of the eye E to be examined. For example, as the presentation distance of the fixation target 200 changes from far to near, and the apparent size of the fixation target 200 increases, the range in which the subject's eye E can gaze at the fixation target 200 becomes wider, and fixation becomes more stable. Sometimes I don't. Even if the apparent size of the fixation target 200 increases, the fixation of the subject's eye E can be easily stabilized if there is a sufficiently small fixation point.

In this embodiment, the fixation target 200 may be composed of an attention target for drawing attention to the left eye EL and the right eye ER, and a background target displayed together with the attention target. FIG. 9 is an example of a fixation target 200 having an attention target 210 and a background target 220 . FIG. 9(a) shows a case in which the display of the display 31 is controlled to move the visual target 210. FIG. FIG. 9(b) shows a case where the rotation of the deflecting mirror 81 is controlled to move the background visual target 220. FIG. 9(a) and 9(b) both show a state in which the display 31 is arranged at a position corresponding to the near presentation distance.

When the fixation target 200 has an attention target 210 and a background target 220 , the attention target 210 may be displayed within the display area 100 according to the presentation distance of the attention target 210 in the fixation target 200 . That is, the target of interest 210 is presented at an appropriate apparent size and position in consideration of the visual angle and convergence angle of the left eye EL and right eye ER for each presentation distance of the target of interest 210 . At this time, the background target 220 on the fixation target 200 may be blurred according to the presentation distance of the attention target 210 on the fixation target 200 .

Further, when the fixation target 200 has the target target 210 and the background target 220 , the parallax may be set for the target target 210 and the background target 220 . Thereby, the attention target 210 and the background target 220 can be realistically presented. For example, when the background optotype 220 is displayed at a distant presentation distance (for example, when the sky or mountains are displayed at a distant presentation distance as shown in FIG. 9), the amount of parallax is small. , the background visual target 220 does not necessarily have to have a parallax.

Further, when the fixation target 200 has the target target 210 and the background target 220 , parallax may be set between the target target 210 and the background target 220 . For example, as shown in FIG. 9A, when controlling the display of the display 31L and the display 31R, the position of the visual target 210 on the display 31 can be changed according to the presentation distance of the visual target 210. , a parallax can be set between the focus target 210 and the background target 220 . In this case, the background target 220L and the background target 220R are the same background target. For example, as shown in FIG. 9B, when controlling the angles of the deflecting mirrors 81L and 81R, the position of the visual target 210 on the display 31 is changed according to the presentation distance of the visual target 210. First, by changing the display of the background visual target 220, a parallax can be set between the target visual target 210 and the background visual target 220. FIG. In this case, the background target 220L and the background target 220R are different background targets. In this embodiment, the parallax set for the fixation target 200 (the parallax of the target of interest 210, the parallax of the background target 220, and the parallax between the target of interest 210 and the background target 220) is It may be set in consideration of the viewing direction center positions of the eye EL and the right eye ER.

In this embodiment, by arranging the display 31 and the display 31R at positions corresponding to a predetermined presentation distance, a configuration in which the presentation distance of the fixation target 200 with respect to the left eye EL and the right eye ER is changed is taken as an example. However, it is not limited to this. In this embodiment, the presenting distance of the fixation target 200 with respect to the left eye EL and the right eye ER may be changed while the positions of the displays 31L and 31R are fixed. For example, in this case, by arbitrarily setting the convergence angles of the left eye EL and the right eye ER with respect to the fixation target 200 displayed on the display 31, the fixation target 200 can be displayed on the display screen of the display 31. may be changed.

Note that, in this embodiment, a configuration for stopping continuous movement of the display 31 and the display 31R with respect to the left eye EL and the right eye ER based on the eye position information of the left eye EL and the right eye ER will be described as an example. However, it is not limited to this. Based on the eye position information of the left eye EL and the right eye ER, guidance information for guiding the movement of the examiner, which is guidance information for stopping the continuous movement of the display 31 and the display 31R, is monitored. 6a. For example, in this case, a message notifying the examiner that the continuous movement of the display should be stopped, a mark indicating the position of the switch to be operated next by the examiner, or the like may be displayed as the guidance information. As a result, the examiner can grasp the fusion state of the subject's eye and easily perform appropriate instructions and operations.

In this embodiment, based on the eye position information of the left eye EL and the right eye ER, the continuous movement of the display 31L and the display 31R is stopped, and the continuous objective values of the left eye and the right eye are changed. Although the configuration for ending the measurement has been described as an example, it is not limited to this. In this embodiment, based on the eye position information of the left eye EL and the right eye ER, even if the continuous movement of the display 31L and the display 31R is stopped, the continuous objective values of the left eye EL and the right eye ER may be configured to continue the measurement.

For example, when the presentation distance of the fixation target is gradually changed, it is detected that the left eye EL and the right eye ER are unable to follow the fixation target in time, and the left eye EL and the right eye ER have released the fusion state. may be At this time, the movement of the display 31 is stopped, but if the following of the fixation target of the left eye EL and the right eye ER catches up with the passage of time, the fused state will reappear. 31 may be restarted. By continuing to measure the objective values of the left eye EL and the right eye ER, the examiner determines whether the cancellation of the fusional state of the left eye EL and the right eye ER is due to the delay in tracking. It is also possible to judge whether it is due to the limit of force or the like.

In this embodiment, objective measurements are performed on the left eye EL and the right eye ER, and when obtaining the accommodative power of the left eye EL and the right eye ER, the left eye EL and the right eye ER are binocular fusion. Although the configuration in which the fixation target is presented so as to be imageable has been described as an example, the present invention is not limited to this. When performing subjective measurement for the left eye EL and the right eye ER, it is also possible to present the test target so that the left eye EL and the right eye ER can fuse together. That is, the technique of this embodiment can also be applied to subjective measurement. In this case, the presentation distance of the test target for the left eye EL and the right eye ER is changed at any time or continuously to change at least one of the apparent size, convergence angle, and parallax of the left eye EL and right eye ER. may be used to measure the subjective values of the left eye EL and the right eye ER.

As an example, when applied to subjective measurement in this way, it can also be used for training when the left eye EL and right eye ER are amblyopia. For example, the presenting distance of the test target for the left eye EL and the right eye ER is continuously and repeatedly moved, the eye position information of the left eye EL and the right eye ER is continuously acquired, and the temporal change of the eye position information is calculated. You can output it as a graph. That is, the temporal change of the eye position information may be visualized so that the examiner can confirm whether or not the effect of the training on the left eye EL and the right eye ER appears.

1 ophthalmic measurement apparatus 7 measurement unit 10 objective measurement optical system 25 subjective measurement optical system 70 control unit 75 memory 81 deflection mirror 84 reflection mirror 85 concave mirror

Claims (3)

a fixation target presenting means for presenting a fixation target to the left eye and right eye of the subject;
objective measurement means for objectively measuring the eye refractive powers of the left eye and the right eye;
An ophthalmic measurement device comprising
eye position information acquisition means for continuously acquiring eye position information regarding the eye positions of the left eye and the right eye;
presentation distance changing means for continuously changing presentation distances of the fixation target for the left eye and the right eye;
Based on the continuous change of the presentation distance of the fixation target, the presentation position of the fixation target for the left eye and the right eye is set to a presentation position where binocular fusion is possible by the left eye and the right eye. a presentation position changing means for continuously changing to a presentation position corresponding to the presentation distance ;
adjustment information acquiring means for acquiring adjustment information regarding accommodation functions of the left eye and the right eye;
with
The presentation distance changing means changes the presentation distance of the fixation target by detecting cancellation of the fusional state by the left eye and the right eye based on the eye position information acquired by the eye position information acquisition means. stops the control that gradually changes from far to near,
The objective measurement means measures the ocular refractive powers of the left eye and the right eye at least at the presentation distance of the fixation target after the change of the presentation distance of the fixation target is started. continuously measure until the change in
The accommodation information acquiring means acquires the accommodation information in binocular vision by the left eye and the right eye based on changes in the eye refractive power continuously measured in the left eye and the right eye. An ophthalmologic measurement device that acquires The ophthalmologic measurement device of claim 1,
A convergence angle changing means for changing the convergence angles of the left eye and the right eye based on the presentation distance, wherein the display of the fixation target presenting means and the optical axis of the objective measuring means are deflected. 1. An ophthalmologic measuring apparatus comprising convergence angle changing means for controlling at least one of: driving a deflecting optical member. The ophthalmologic measurement device according to claim 1 or 2,
Parallax setting means for setting a parallax based on the presentation distance with respect to the fixation target,
The ophthalmologic measuring apparatus, wherein the fixation target presenting means presents, as the fixation target, a fixation target having the parallax set by the parallax setting means.

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