JP6733160B2 - Optometry device and optometry program - Google Patents

Description

The present disclosure relates to an optometry apparatus and an optometry program for inspecting an eye to be inspected.

Inside the pair of left and right lens units, a plurality of rotating discs with various optical elements are provided, and by rotating these rotating discs, the optical elements with the desired optical characteristics are switched to the optometry window for refraction of the subject's eye. 2. Description of the Related Art An optometry device that subjectively tests force is known.

In the correction refractive power test using this type of optometry device, the left and right eyes are individually tested. The eye to be inspected (hereinafter referred to as the measurement eye) is caused to observe the inspection target through the optical element arranged in the optometry window. For the eye not to be examined (hereinafter referred to as the non-measurement eye), a shield plate provided on one of the rotating discs is arranged in the eye examination window so that the examination target cannot be seen.

There is also known a method in which a positive spherical power is loaded without placing a shield on the non-measurement eye side, and an examination is performed with both eyes open with a cloud on one eye.

JP, H10-285470, A

However, since the appearance in the corrected state varies depending on the subject, it may be necessary to adjust the added power to apply the fog.

In view of the conventional problems, the present disclosure provides an optometry apparatus and an optometry program that can easily set a fog state suitable for a subject when performing a one-eye examination with both eyes open. It is an issue.

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

(1) An optometry apparatus for inspecting an eye to be inspected, comprising a pair of left and right lens units arranged in an optical path of a target light flux projected onto a subject and changing optical characteristics of the target light flux. It comprises a control means for controlling the driving of the lens unit, and an acquisition means for acquiring a target visual acuity value during cloudy weather, the control means, the visual acuity value of the eye to be examined during cloudy weather is acquired by the acquisition means. In addition, the amount of fog for making the eye to be fogged is determined such that the target visual acuity value is obtained .
(2) An optometry device for inspecting an eye to be inspected, which includes a pair of left and right lens units arranged in an optical path of a target light flux projected on a subject and changing optical characteristics of the target light flux. The control unit that controls the drive of the lens unit, and an acquisition unit that acquires the visual acuity value of the subject, the control unit, according to the visual acuity value acquired by the acquisition unit, the eye to be examined. It is characterized by correcting the amount of fog for making the cloud.
(3) An optometry program executed by an optometry apparatus for inspecting an eye to be inspected, which is executed by a processor of the optometry apparatus to obtain a target visual acuity value at the time of fog; The eye acuity value of the eye to be inspected is determined so as to become the target eye acuity value acquired in the acquisition step, and a determination step of determining the amount of cloud to be added to fog the eye to be inspected, causing the eye examination apparatus to execute the step. Is characterized by.

It is the schematic which showed the whole optometry system of a present Example. FIG. 3 is a schematic external view of the optometry apparatus of this embodiment as viewed from the subject side. It is a horizontal sectional view of the optometry apparatus of the present embodiment. It is a figure for explaining an auto cross cylinder lens. It is a control system block diagram of a present Example. It is a flow chart which shows operation of this example. It is a figure which shows the setting screen of a cloud parameter. It is a figure explaining calculation of the amount of fog. It is a figure explaining how a point cloud chart looks. It is a figure explaining how a point cloud chart looks. It is a figure explaining rotation control of an auto cross cylinder lens. It is a figure which shows an example of the display screen of a controller. It is a figure explaining the appearance of the visual target at the time of cloudy weather. It is a figure for demonstrating an eye view.

Hereinafter, the first embodiment according to the present disclosure will be briefly described. The optometry apparatus of the first embodiment (for example, the optometry apparatus 100) inspects an eye to be examined, for example. The optometry apparatus may include, for example, a lens unit (for example, the lens unit 110 or the like), an acquisition unit (for example, the control unit 370 or the like), and a control unit (for example, the control unit 370 or the like). The lens units are provided, for example, as a left and right pair. The lens unit is arranged, for example, in the optical path of the target luminous flux projected on the subject. The lens unit changes, for example, the optical characteristics of the target luminous flux. The lens unit may include, for example, an optometry window (eg, optometry window 160 or the like). Then, the lens unit may switch and arrange a plurality of lenses in the optometry window. The plurality of lenses may be, for example, a spherical lens, a cylindrical lens, an auxiliary lens, or the like.

The acquisition unit acquires a target visual acuity value during cloudy weather. The target visual acuity value may be, for example, a visual acuity value when clouding is applied to a non-measuring eye (referred to as a non-measuring eye), and as a result, by applying clouding to the non-measuring eye, You may have limited eyesight. In this case, the measurement eye may be inspected while the non-measurement eye is fogged. The acquisition unit may acquire the target visual acuity value, for example, based on an operation signal output from the operation unit (for example, the controller 300) according to the operation of the examiner.

The control unit controls the driving of the lens unit, for example. For example, the control unit may control switching of the lens arranged in the optometry window, driving of the lens arranged in the optometry window, and the like. The control unit may determine, for example, the amount of fog for making the subject eye fog based on the target visual acuity value acquired by the acquisition unit. Thereby, for example, the examiner can easily perform the examination in a state where the cloud is applied with a desired visual acuity value.

The acquisition unit may further acquire the visual acuity value of the subject, for example. The visual acuity value of the subject may be, for example, the visual acuity value acquired by the subjective test, or the visual acuity value estimated according to the correction state of the eye to be inspected. Further, the acquisition unit may acquire the visual acuity value when the inspection is performed for each eye or the visual acuity value when the inspection is performed with both eyes. In this case, the control unit may determine the amount of fog based on the target visual acuity value acquired by the acquisition unit and the visual acuity value of the subject.

For example, the control unit may determine the amount of fog based on the power according to the target visual acuity value and the correction value according to the visual acuity value of the subject. Here, the correction value may be a frequency obtained by converting the degree of blurring of the visual acuity value of the subject. For example, the correction value may be a value obtained by converting the deviation between the image formation position of the test target entering the eye to be inspected and the position of the retina of the eye to be inspected into the power of the lens in a state where the eye is corrected. ..

In addition, when the visual acuity value of the subject is acquired by the acquisition unit, the control unit corrects the amount of fog for causing the eye to be fogged in accordance with the visual acuity value of the subject acquired by the acquisition unit. Good. For example, the control unit may correct the predetermined amount of fog according to the visual acuity value of the subject.

The control unit may cause the optometry apparatus to execute the optometry program stored in the storage unit (for example, the storage unit 340 or the like). For example, the optometry program includes an acquisition step and a determination step. The acquisition step is, for example, a step of acquiring the target visual acuity value during cloudy weather and the visual acuity value of the subject. The determining step is, for example, a step of determining a cloud amount for clouding the eye to be inspected, based on the target visual acuity value and the measured visual acuity value.

Note that the optometry apparatus of the first embodiment may perform a monocular examination with both eyes open by disposing a prism lens for the non-measurement eye and removing the line of sight of the non-measurement eye from the examination target. .. In this case, the acquisition unit may acquire the prism value of the subject. Further, the control unit may determine the prism value of the prism lens arranged for the eye to be inspected, according to the prism value of the subject acquired by the acquisition unit by the acquisition unit. This allows the optometry apparatus to reliably remove the line of sight of the non-measurement eye from the examination target.

Hereinafter, the second embodiment according to the present disclosure will be briefly described. The optometry apparatus (for example, the optometry apparatus 100) of the second embodiment includes, for example, a lens unit (for example, the lens unit 100), a driving unit (for example, the driving units 150R and 150L), and a control unit (for example, the control unit 370). ) Etc. The lens units are respectively arranged in the first optical path and the second optical path, for example. Here, the first optical path is, for example, the optical path of the target light flux projected on the right eye of the subject, and the second optical path is the optical path of the target light flux projected on the left eye of the subject. .. The lens unit may include at least an auto cross cylinder lens, for example. In this case, the lens unit changes the optical characteristics of the target light flux in the first optical path and the second optical path by at least the auto-cross cylinder lens. The auto cross cylinder lens separates the visual field of the eye to be inspected by, for example, a prism component. For example, the auto-cross cylinder lens separates the field of view of the subject's eye so that one inspection target looks like two.

For example, the drive unit may rotate and drive the lenses arranged in the first optical path and the second optical path, respectively. The control unit controls the driving of the drive unit, for example. For example, the control unit drives so that the separation directions of the inspection targets separated by the auto-cross cylinder lenses arranged in the first optical path and the second optical path are the same in the first optical path and the second optical path. You may control the drive of a part. For example, the control unit may arrange the auto-cross cylinder lenses in the first optical path and the second optical path so that the axes of the auto-cross cylinder lenses have the same axial angle in the first optical path and the second optical path, respectively. .. As a result, the measuring eye and the non-measuring eye on which the cloud is fogged have the same direction of separation of the targets, and an appropriate examination can be performed with both eyes open.

The drive unit may include a rotation drive unit that changes the rotation angles of the lenses arranged in the first optical path and the second optical path. In this case, the control unit controls the drive of the rotation drive means to keep the axial angle of the auto-cross cylinder lens arranged in the first optical path and the second optical path the same in the first optical path and the second optical path. You may rotate in conjunction with each other. For example, when rotating the auto-cross cylinder lens by the rotation driving unit, the control unit may match the rotation direction and the rotation amount of the auto-cross cylinder lens respectively arranged in the first optical path and the second optical path.

When the rotation driving unit rotates the auto-cross cylinder lens, the control unit may match the rotation speeds of the auto-cross cylinder lenses arranged in the first optical path and the second optical path, respectively.

The processor of the control unit may cause the optometry apparatus to execute the optometry program stored in the storage unit (for example, the storage unit 340 or the like). The optometry program includes, for example, control steps. The control step is, for example, by a lens unit, a first optical path that is an optical path of a target light flux projected onto the right eye of the subject and a first optical path that is an optical path of the target light flux projected onto the left eye of the subject. A step of controlling the driving of the lens unit such that the separation directions of the inspection targets observed through the two optical paths and the auto-cross cylinder lenses respectively arranged in the two optical paths are the same in the first optical path and the second optical path. Is.

Note that the lens unit may include, for example, an optometry window (for example, an optometry window 160) for allowing the subject to look into the examination target. In this case, a plurality of lenses including an auto-cross cylinder lens are switched and arranged in the right optometry window (for example, the right optometry window 160R) on the first optical path and the left optometry window (for example, the left optometry window 160L) on the second optical path. You may.

Even when a lens having a prism component that separates the inspection target into at least two, such as an auto-cross cylinder lens, is provided, the inspection observed through the lenses respectively arranged in the first optical path and the second optical path. The driving of the drive unit may be controlled so that the directions of separation of the optotypes are the same in the first optical path and the second optical path. In this case, the optometry apparatus of the second embodiment is an optometry apparatus that examines the eye to be inspected, and includes the first optical path that is the optical path of the target light flux projected on the right eye of the subject and the left side of the subject. A pair of left and right that are arranged respectively on the second optical path, which is the optical path of the target light flux projected onto the eye, and change the optical characteristics of the target light flux by the lens having at least a prism component in the first optical path and the second optical path, respectively. A lens unit, a drive unit for driving the lens unit, and a control unit for controlling the drive of the drive unit are provided, and the control unit interposes lenses having prism components respectively arranged in the first optical path and the second optical path. It may be expressed as an optometry device characterized by controlling the drive of the drive unit so that the separation direction of the examination target observed by the first optical path and the second optical path are the same.

Hereinafter, the third embodiment according to the present disclosure will be briefly described. The optometry information display device (for example, a display terminal such as the controller 300) of the third embodiment displays the optometry information of the subject's eye. The optometry information may be, for example, the examination status of the subject's eye, the examination result, or the like. The optometry information display device may include, for example, a control unit (for example, the control unit 370). The control unit displays the binocular simulation image on the display unit (for example, the display unit 320), for example. The binocular simulation image shows, for example, the appearance when the inspection target is viewed with both eyes. The binocular simulation image may be, for example, one (single) image. The binocular simulation image is, for example, a single simulation image assuming that the inspection target is viewed with the measurement eye corrected by the lens unit or the like and the non-measurement eye that is clouded by the lens unit or the like. It may be. That is, the binocular simulation image is obtained by each of the left and right eyes when the inspection target is viewed with the measurement eye corrected by the lens unit or the like and the non-measurement eye fogged by the lens unit or the like. It may be a single simulation image in which the retinal image is fused in the brain. For example, when the non-measurement eye is fogged, there is a large difference in appearance between the measurement eye and the non-measurement eye, and it is difficult to visualize the appearance with both eyes. Even in such a case, since the binocular simulation image is displayed, the examiner can easily understand the appearance with both eyes.

The control unit may further display, for example, a one-eye simulation image on the display unit. The one-eye simulation image is, for example, at least one of a right-eye simulation image and a left-eye simulation image. The right-eye simulation image is, for example, an image showing the appearance when the inspection target is viewed by the right eye. The left-eye simulation image is, for example, an image showing the appearance when the inspection target is viewed by the left eye. By displaying the binocular simulation image and the monocular simulation image, the examiner can easily understand the relationship between the appearance with one eye and the appearance with both eyes.

The control unit may set the sharpness of at least one of the binocular simulation image and the one-eye simulation image based on the visual acuity value of the eye to be inspected. The visual acuity value of the eye to be examined may be, for example, a value obtained by a visual acuity test, a value arbitrarily input by the examiner, or a value estimated based on the correction state of the subject. For example, the visual acuity value of the eye to be inspected may be an eye acuity value estimated when the eye to be inspected is fogged, or based on the correction information of the eye to be corrected by the correction unit (for example, the lens unit 110). It may be an estimated visual acuity value. Here, the definition may be, for example, at least one of the degree of blurring of an image, the vividness of colors, the contrast, the resolution, the brightness, and the like.

Note that the control unit may set the sharpness of the binocular simulation image based on the higher one-eye visual acuity value of the left and right monocular visual acuity values. In general, with respect to the appearance with both eyes, the one with a clearer appearance of the left and right eyes is often prioritized. Therefore, the control unit may determine the sharpness of the binocular simulation image based on the appearance of the eye with the higher visual acuity.

The control unit may change the sharpness of the simulation image of at least one of both eyes and one eye according to the change in the power of the correction optical system of the correction unit that corrects the eye to be inspected. This allows the examiner to easily understand the change in the correction state of the subject and the change in the appearance at that time.

The control unit may cause the display unit to display the eye view. The eye diagram is, for example, a diagram in which at least the eye to be inspected and the image formation position of the target light flux incident on the eye to be inspected are depicted. By displaying the eye map, the examiner can objectively grasp the appearance of the subject. Further, the ocular diagram may include a depiction of the correction optical system arranged in front of the eye to be examined. The control unit may change the depiction of the ocular diagram, for example, according to the change in the correction state of the subject's eye that is corrected by the correction unit. For example, the control unit may change the image forming position of the target light flux, the shape of the correction optical system, the number of lenses, and the like.

The processor of the control unit may cause the optometry information display device to execute the optometry information display program stored in the storage unit (for example, the storage unit 340). The optometry information display program includes, for example, a display step. The display step is, for example, a step of displaying on the display unit a binocular simulation image showing the appearance when the inspection target is viewed with both eyes.

In the above description of the embodiments, the lens unit of the optometry apparatus may be arranged on the side of the subject (for example, in front of the eye of the subject) or may be arranged on the side of the optotype presenting apparatus. For example, the lens unit may be arranged inside the optotype presenting apparatus (for example, the optotype presenting apparatus 200) (so-called phantom type). In this case, the optotype presenting apparatus may be configured to project the optotype light flux whose optical characteristics are corrected by the lens unit disposed inside, onto the eye to be inspected. Here, the optotype presenting device is, for example, a device that projects an inspection optotype onto the subject.
The lens unit that changes the optical characteristics of the target luminous flux is not limited to the lens switching mechanism, and may have a configuration in which an Alvarez lens is arranged in the lens unit.

<Example>
Hereinafter, the optometry system 500 of this embodiment will be described. As shown in FIG. 1, the optometry system 500 of this embodiment includes, for example, an optometry apparatus 100, an optotype presenting apparatus 200, a controller 300, a relay unit 400, and the like. For example, the optometry apparatus 100 is suspended on the holding arm 5. One end of the holding arm 5 is fixed to the base 10.

<Optometry device>
As shown in FIG. 2, the optometry apparatus includes a pair of left and right lens units 110 (a left lens unit 110L and a right lens unit 110R). The lens unit 110 includes a lens disk 120 (left lens disk 120L, right lens disk 120R). The lens disk 120 is rotatably held by the lens unit 110 (see FIG. 2). A large number of optical elements (spherical lenses, cylindrical lenses, dispersion prisms, etc.) are arranged on the lens disk 164 on the same circumference. The lens disc 120 is rotationally controlled by the drive units (actuators) 130R and 130L, so that the optical element desired by the examiner is arranged in the optometry window 160 (left optometry window 160L, right optometry window 160R). Further, the optical elements (for example, a cylindrical lens, a cross cylinder lens, a rotary prism, etc.) arranged in the optometry window 160 are rotationally controlled by the drive units 150R and 150R, so that the optical element can be rotated at a rotation angle desired by the examiner. Are placed. Switching of the optical elements arranged in the optometry window 160 is performed by operating the controller 300 (see FIG. 1) which is an operating unit. For the drive units 130R and 130L and the drive units 150R and 150L, for example, motors, solenoids, and the like are used, but the drive units 130R and 130L are not limited thereto.

The lens unit 110 may include a plurality of lens disks. For example, each lens disc comprises an aperture (or 0D lens) and a plurality of optical elements. As shown in FIG. 3, examples of the type of each lens disk include spherical lens disks 121R and 121L, cylindrical lens disks 122R and 122L, auxiliary lens disks 123R and 123L, and the like. The spherical lens disks 121R and 121L have, for example, a plurality of spherical lenses having different diopters. The cylindrical lens disks 122R and 122L have, for example, a plurality of cylindrical lenses having different frequencies. At least one of a red filter/green filter, a prism, a cross cylinder lens, a polarizing plate, a Maddox lens, and an auto cross cylinder lens is arranged on each of the auxiliary lens disks 123R and 123L. Further, the cylindrical lens, the rotary prism, the auto-cross cylinder lens, and the like are arranged rotatably around the optical axis L1 or the optical axis L2 by the driving units 150R and 150L. The drive units 130R and 130L and the drive units 150R and 150L may be provided for each lens disk.

The auto cross cylinder lens is a lens for performing a cross cylinder (auto cross) test. The cross cylinder test is a test for measuring the astigmatism direction and dioptric power of the eye to be inspected. For example, as shown in FIG. 4, the auto cross cylinder lens Ac is provided with two prism regions G1 and G2 that separate the field of view. The two prism regions G1 and G2 are separated, for example, with the axis L3 as a boundary. In this case, for example, the field of view is separated in the direction perpendicular to the axis L3. Furthermore, astigmatic power is given to each prism area, and the astigmatic axes are orthogonal to each other.

Note that the optometry apparatus 100 may include, for example, a mechanism that adjusts the distance between the left and right lens units 110, a mechanism that adjusts the convergence angle (orientation angle) of the left and right lens units 110, and the like. Further, the optometry apparatus 100 may include a forehead pad 170 that comes into contact with the subject's forehead. The forehead support 170 has a role of holding the head of the subject and fixing the position of the eye to be examined at a predetermined examination position.

It should be noted that the optometry apparatus 100 is not limited to the above configuration, and may have any configuration as long as it can electrically switch the optical elements arranged in front of the eye to be inspected. For example, the power may be switched by driving the electro-active lens.

<Target display device>
The optotype presenting apparatus 200 includes an optotype presenting unit 210 that presents an examination optotype. The optotype presenting apparatus 200 is connected to the controller 300 via the relay unit 400, and the optotypes displayed on the optotype presenting unit 210 are switched by operating the controller 300 or the like.

The optotype presenting apparatus 200 displays the examination optotype on the optotype presenting section 210 according to the operation signal input from the controller 300. The optotype presenting apparatus 200 is located at substantially the same height as the optometry apparatus 100, and is installed so as to be separated from the optometry apparatus 100 by a distance suitable for the examination. In this embodiment, the distance between the optometry apparatus 100 and the optotype presenting apparatus 200 is set to a distance (for example, 5 m) suitable for the distance examination. The optotype presenting apparatus 200 is not limited to the illustrated display, and a chart projector for projecting the optotype on the screen, a space-saving optotype projecting apparatus for projecting the optotype via a concave mirror, or the like is used.

As shown in FIG. 1, the optometry apparatus may include a near vision target presenting unit 104 for performing a near vision examination. The near optotype presenting section 104 is slidably held by, for example, a rod 102 attached to an optometry apparatus. The near vision presenting unit 104 includes, for example, a chart plate on which a plurality of examination indices are drawn, a liquid crystal display, or the like.

<Controller>
The controller 300 shown in FIG. 1 operates at least one of the optometry apparatus 100 and the optotype presenting apparatus 200. The controller 300 has an operation panel 310 on which a plurality of operation buttons are arranged and a display panel 320 having a touch panel function, and detects the operation of the operator on the operation panel 310 and the display panel 320. The controller 300 outputs a drive signal to the optometry apparatus 100 and the optotype presenting apparatus 200 based on the operation of the examiner. The controller 300 is used, for example, to instruct switching of the optical element arranged in front of the eye.

As shown in FIG. 5, the control unit 370 functions as an execution subject of the controller 300. The control unit 370 executes various processes according to a program for controlling the optometry apparatus 100 and the optotype presenting apparatus 200. Such a program is stored in the storage unit 340 provided in the controller 300, for example.

The control unit 370 that controls the optometry apparatus 100, the optotype presenting apparatus 200, and the like is not limited to the controller 300, and may be included in the optometry apparatus 100, the optotype presenting apparatus 200, the relay unit 400, and the like.

<Relay unit>
The relay unit 400 shown in FIG. 1 is a unit that controls the power supply of the optometry apparatus 100 and the communication from the controller 300 to the optometry apparatus 100 and the optotype presenting apparatus 200. The relay unit 400 is connected to the controller 300, the optometry apparatus 100, and the optotype presenting apparatus 200. The connection is made wirelessly or by wire. The relay unit 400 includes a control unit 200 (see FIG. 5) including a CPU and the like, receives a control command from the controller 300, and controls the optometry apparatus 100 and the optotype presenting apparatus 200. Note that the relay unit 400 is not necessarily an essential configuration, and may have a configuration in which the optometry apparatus 100 and the optotype presenting apparatus 200 receive a control command from the controller 300.

<Control operation>
The operation of the apparatus having the above configuration will be described (see the inspection procedure flowchart in FIG. 6). In the following description, a case where a cloud is applied to a non-measurement eye at the time of one-eye measurement and the inspection is performed with both eyes open is taken as an example. In the examination performed with both eyes open, unnecessary adjustment of the subject's eye is less likely to occur as compared with the case of shielding with a shielding plate, and an appropriate examination is easy to perform. When performing cloud haze, the examiner sets the cloud parameter for determining the cloud amount before the inspection. The cloud parameters include, for example, a target visual acuity value during cloud. For example, the control unit 370 causes the display unit 320 to display the visual acuity value setting screen 360 as shown in FIG. 7, and receives the input of the target visual acuity value from the examiner. On the visual acuity value setting screen 360, for example, selection buttons 361 and 362, a setting button 363, etc. are displayed. In this case, the examiner may operate the selection button 361 or the selection button 362 to select the target visual acuity value at the time of fog, and press the setting button 363 to input the selected target visual acuity value. The control unit 370 receives the input of the target visual acuity value and stores it in the storage unit 340 or the like (step S1). The target visual acuity value does not have to be set for each examination. For example, once setting is performed on the setting screen, the same target visual acuity value is used for subsequent examinations.

After setting the target visual acuity value, the examiner starts the examination of the eye to be examined. In this embodiment, a preliminary inspection is performed before subjectively measuring the refractive power (step S2). The preliminary examination is, for example, objective measurement by the eye refracting power measuring device 600 (see FIG. 5), front eyeglass measurement, one eye cover test, alternate cover test, naked eye/front eyeglass visual acuity confirmation, balance by polarization RG (red green). Tests, visual acuity measurement with objective values, etc. When the subject wears spectacles, the power (spectacle value data) of the spectacle lens may be measured by the lens meter 700, and the result may be used as information for prescription. Each measurement data can be input to the controller 300. For example, the measurement data is stored in the storage unit 340 or the like. The controller 300 may receive the measurement results of the eye-refractive-power measuring device 600, the lens meter 700, and the like in a wireless or wired manner by communication means, or may be input by an examiner.

In the optometry window 160 of the optometry apparatus 100, for example, an initial setting optical system is arranged. At this time, when the objective value data or the previous spectacle value data input in advance is called, the correction optical system based on the data is arranged in the left and right optometry windows 160, and the subjective examination can be efficiently performed. In the following description, it is assumed that the objective value data is used.

When the lenses based on the objective value data are arranged in the left and right optometry windows 160, the examiner confirms whether or not the right and left eyes look appropriately by, for example, a polarized R/G examination. A polarized R/G test target is used as the test target. In the polarized R/G inspection target displayed on the target presenting unit 210, for example, the polarization directions of the right-eye target and the left-eye target are orthogonal to each other. For example, the polarization direction of the right eye target is set to 135°, and the polarization direction of the left eye target is set to 45°. Polarization lenses provided on the auxiliary lens disks 123R and 123L are arranged in the left and right optometry windows with polarization axes corresponding to the left and right optotypes. The examiner confirms, for example, whether the left and right optotypes corresponding to each other are visible and how the left and right visual appearances are balanced. This will confirm whether the test performed using cloud instead of occlusion is appropriate for the subject. For example, in a polarized R/G test, when both the right eye target and the left eye target are invisible, this test is not suitable. Also, it is confirmed whether or not the value of the correction optical system initially set based on the objective value data is appropriate. Then, for example, the visual acuity test confirms the visual acuity values of both eyes. The control unit 370 stores, for example, the visual acuity value obtained by the visual acuity test in the storage unit 340 or the like.

When the visual acuity values of both eyes are confirmed, the control unit 370 calculates the amount of fog for applying fog to the eye to be inspected (step S3). For example, the control unit 370 calculates the amount of fog based on the visual acuity value of the subject stored in the storage unit 340 or the like in step S2 and the target visual acuity value input by the examiner before the examination.

The control unit 370 may determine the amount of fog based on, for example, the tables shown in Tables 1 and 2 below. Table 1 shows the relationship between the target visual acuity value at the time of fog and the spherical power A1 added to multiply the fog at the target visual acuity value from the state corrected by the autoref value (objective measurement value). Table 2 shows the correspondence between the visual acuity value when the visual acuity is measured in the state corrected by the auto reflex value, and the spherical power A2 corresponding to the degree of blur when the visual target is viewed with the visual acuity value.

For example, the control unit 370 may obtain the amount of fog F by substituting numerical values corresponding to the visual acuity value and the fog parameter of the subject into the following equation (1). The formula (1) is a formula for obtaining the amount of fog F by subtracting the size of the spherical power A2 corresponding to the target visual acuity value from which the degree of blurring in the state corrected by the autoref value is converted.

For example, when the target visual acuity value of 0.7 is input by the examiner, the control unit 370 applies the fog to such an extent that the non-measuring eye can see the visual target having the visual acuity of 0.7. The control unit 370 determines, for example, the spherical power A1 for the visual acuity value 0.7 according to Table 1 and the spherical power A2 corresponding to the visual acuity value measured for visual acuity according to Table 2, and substitutes it into the equation (1). Here, when the result of the visual acuity measurement is a visual acuity of 0.9, since A1=0.75D and A2=±0.25, F=0.50 from the equation (1).

As described above, when the subject's visual acuity is small (for example, less than 1.0), the control unit 370 is already in a blurry state, so that the spherical power A1 corresponding to the target visual acuity value during fog is set. On the other hand, the cloud amount F subtracted by the spherical power A2 is added to the non-measurement eye (see FIG. 8). That is, the control unit 370 determines the final cloud amount F by correcting the reference frequency with the correction frequency. In the present embodiment, the spherical power A1 necessary for reducing the estimated visual acuity value (for example, 1.0 or more) estimated in the state corrected by the objective measurement value to the target visual acuity value is the reference. Then, the spherical power A2 for correction is determined based on the difference between the actual visual acuity value of the subject and the estimated visual acuity value in the state corrected by the objective measurement value.

Of course, the calculation method of the amount of fog F is not limited to the above example. For example, the control unit 370 may set the spherical power A1 necessary for obtaining the target visual acuity value as the fog amount F regardless of the visual acuity value at the autoref value. The cloud may be applied by adding not only the spherical power but also the cylindrical power.

The above Tables 1 and 2 are examples, and the numerical values can be changed arbitrarily. Further, although the amount of fog is determined from Table 1 and Table 2, the amount of fog may be calculated by a conversion formula or the like without using the table.

Further, the control unit 370 may add a constant amount of fog. For example, the control unit 370 sets a fixed value (for example, 0.3) as the target visual acuity value during cloudy weather, and adds the amount of fog so that the visual acuity value during cloudy weather becomes the set fixed value. Good.

In addition, when the autoref value is not input, the control unit 370 may calculate the fog amount on the assumption of the visual acuity value corrected with the autoref value. For example, the control unit 370 may calculate the fog amount with the visual acuity value of the autoref value set to 1.0. When the visual acuity value is 1.0, since the spherical power A2 is 0D from Table 2, the fog amount F has the same value as the spherical power A1 corresponding to the target visual acuity value.

When the amount of cloud is determined, the control unit 370 further sets the amount of cloud (for example, plus spherical power) to the spherical power already arranged in the optometry window 160 before performing the inspection using the cloud function. A command signal is sent to the optometry apparatus 100 so as to apply a load. The control unit 370 drives and controls the spherical lens disk 121R or the spherical lens disk 121L, for example, and adds the calculated amount of cloud (step S4).

In this way, the amount of fog is automatically set by the control unit 370, so that the examiner can save the trouble of operating the controller 300 to change the power of the lens disk 120. Further, as compared with the case where the amount of fog is set to a predetermined amount (for example, +1.00D), the amount of fog is set from the visual acuity value of the subject, so that the state of fog desired by the examiner can be appropriately reproduced. For example, even if the object is corrected with the objective measurement value, the subject may see the visual acuity of 1.0 or only the visual target of the visual acuity of 0.9. In this case, there is a difference in the appearance of the clouded non-measuring eye between the case where +1.00 D is applied in the state of visual acuity of 1.0 and the case where +1.00 D is applied in the state of visual acuity of 0.9. In other words, when +1.00D is applied in the state of visual acuity of 0.9, it is more blurred than when +1.00D is added in the state of visual acuity of 1.0. As described above, by setting the amount of fog based on the visual acuity value, it is possible to realize the fog state desired by the examiner for any subject even when the visual acuity values are different.

There may be a plurality of cloud parameters set by the examiner. For example, the examiner may input the first target visual acuity value, the second target visual acuity value, and the like as the fog parameters. When a plurality of target visual acuity values are input as the cloud parameters, the cloud may be first applied to reach the first target visual acuity value, and then the visual target may be changed to reach the second target visual acuity value.

When the cloud is applied to the eye to be inspected, one eye measurement is started (step S5). For example, the examiner operates the controller 300 to release the fog only on the measurement eye in a state where the fog is applied to both eyes of the subject, and sets the weakest frequency at which the maximum visual acuity is obtained. After that, an R/G test for preventing overcorrection, a cross cylinder test (an astigmatic axis test and an astigmatic power test), etc. are performed, and the maximum visual acuity value of one eye is confirmed by a visual acuity test.

<Cross cylinder test>
Next, an astigmatic dioptric power and astigmatic axis monocular examination using an auto-cross cylinder lens will be described. The examiner operates the controller 300 to display the point cloud chart on the optotype presenting apparatus 200. Then, the control unit 370 arranges the auto-cross cylinder lenses Ac in the eye examination windows 160 of the measurement eye and the measurement eye, respectively. In this way, by disposing the auto-cross cylinder lenses Ac on the left and right optometry windows 160, it is possible to perform a cross-cylinder test under the condition that both eyes are open using fog even when the auto-cross cylinder is used.

For example, when the auto cross cylinder lens is arranged only in the eye examination window on the measurement eye side, two point cloud charts are visible on the measurement eye side due to the prism component of the auto cross cylinder lens as shown in FIG. 9A. As shown in FIG. 9B, the point cloud charts do not separate on the non-measurement eye side and appear as one. In this case, the retinal images of the left and right eyes are not fused well, and for example, the point cloud chart looks like three (see FIG. 9C). For this reason, the subject may not know which point cloud chart is visible by the measurement eye, and may not be able to perform an appropriate examination. Therefore, by disposing the auto-cross cylinder lenses Ac in the left and right eye examination windows 160 and separating the point cloud charts on both the left and right sides as described above, an appropriate cross cylinder test can be performed with both eyes open.

For example, as shown in FIG. 10A, two point cloud charts are visible on the side of the measuring eye due to the prism component of the auto-cross cylinder lens, and as shown in FIG. Two point cloud charts are visible due to the prism component of the lens. Therefore, as shown in FIG. 10C, the point cloud charts that can be seen by the measurement eye and the non-measurement eye are properly fused, and the cross cylinder test can be performed.

At this time, the control unit 370 arranges the left and right auto-cross cylinder lenses Ac so that the directions of the axes L3 thereof coincide with each other. For example, the control unit 370 controls the angle of the axis L3 of the non-measurement eye side auto-cross cylinder lens in accordance with the angle of the axis L3 of the measurement eye-side auto cross cylinder lens. For example, in the case of FIG. 11, the control unit 370 controls the angle θ1 of the axis L3 of the auto cross cylinder lens Ac arranged in the right optometry window 160R and the axis L3 of the auto cross cylinder lens Ac arranged in the left optometry window 160L. Match the angles θ2. This is because the direction of separation when the point cloud chart is separated into two is made to coincide by the prism of the auto cross cylinder lens. When the separation directions of the point cloud charts are matched in the left and right eyes, the left and right retinal images are successfully fused, and an appropriate examination can be performed with both eyes open. Although the control unit 370 has been described as controlling the angles θ1 and θ2 of the axis L3 with respect to the vertical direction, the present invention is not limited to this. For example, the control unit 370 may control the relative angle of the axis L3 of the left and right auto cross cylinder lenses.

The examiner rotates the axis of the auto-cross cylinder lens until the difference in appearance between the two divided point cloud charts becomes small. At this time, the control unit 370 may rotate the automatic cross cylinder lens arranged on the measurement eye side and the automatic cross cylinder lens arranged on the non-measurement eye side in synchronization with each other. For example, the control unit 370 may control the rotation of the non-measurement eye side auto cross cylinder lens in accordance with the rotation of the measurement eye side auto cross cylinder lens. For example, in the case of FIG. 11, the control unit 370 controls the rotation direction K1 of the axis L3 of the auto cross cylinder lens Ac arranged in the right eye examination window 160R and the axis L3 of the auto cross cylinder lens Ac arranged in the left eye examination window 160L. The rotation directions K2 of are matched. Further, the control unit 370 may match the rotation amount and the rotation speed of the left and right auto cross cylinder lenses Ac. In this way, the control unit 370 controls the drive units 150R and 150L so that, for example, at least one of the rotation amount, the rotation direction, the rotation speed, and the like becomes equal, and the measurement-eye-side and non-measurement-eye-side auto-cross cylinders are used. Rotate the lens. As a result, even when the auto cross cylinder lens is rotated, the separation directions of the point cloud charts observed by the left and right eyes match, and the retinal image is easily fused.

When the adjustment of the astigmatic axis is completed, the astigmatic power is adjusted. For example, the examiner drives the cylindrical lens disks 122R and 122L to switch the cylindrical power until the difference in appearance of the two divided point cloud charts becomes small.

The control unit 370 switches the measurement eye to the other eye when the monocular examination for one eye is completed. In this case, the control unit 370 becomes the optical system of the spherical diopter by the R/G inspection performed previously, with the amount of fog being canceled on the side of the eye to be measured. On the other hand, the cloud amount calculated in the same manner as in step S4 is added to the non-measurement eye side.

When the left and right monocular tests are completed, the control unit 370 proceeds to the next binocular balance test (step S7). At this time, the control unit 370, for example, disposes the polarizing plates of the auxiliary lens disks 123R and 123L in the left and right optometry windows, and cancels the fog on the non-measurement eye. When the binocular tolerance test is completed, the process then moves to the measurement of the binocular perfect correction value (step S8). For example, the control unit 370 once applies a fog to both eyes and measures the weakest frequency at which the maximum visual acuity is obtained. The control unit 370 ends the inspection when the binocular complete correction value is obtained.

In the above description, the test target presented by the target presenting apparatus 200 has been described as being able to be confirmed by both the left and right eyes, but even if the test target is visible only to the measurement eye using polarized light. Good. For example, the optotype presenting apparatus 210 may include a polarization optical member to polarize the optotype luminous flux. Then, the inspection target may be visible only to the measurement eye by the polarization optical element arranged in the eye examination window. As described above, the cloud may be applied to the non-measurement eye as described above when the inspection of the open state of both eyes is performed by using the polarized light. As a result, it is possible to suppress the influence of the non-measurement eye on the examination of the measurement eye.

<Display screen>
Next, the display of the controller 300 of this embodiment will be described. FIG. 12 is a diagram showing an example of the display screen 321 of the controller 300. On the display screen 321, for example, a simulation image 323 or the like showing how the subject looks with both eyes is displayed.

The binocular simulation image 323 may be, for example, an image showing how the binocular vision is supposed when the subject looks at the examination target through the examination window 160. For example, the simulation image 323 may be an image that assumes that the retinal images obtained by the left and right eyes are fused. When the retinal image is fused, a clearer image is often preferentially viewed from the left and right. For example, FIG. 13A shows how the left eye looks at the target, FIG. 13B shows how the right eye looks at the target, and FIG. 13C shows how both eyes see the target. Show. As shown in FIG. 13, when the left eye looks blurred due to the cloud and the right eye looks clear, the appearance with both eyes is clear because the right eye has priority.

Therefore, the control unit 370 simulates, with both eyes, the clearly visible one of the left and right eyes based on the information such as the left and right visual acuity values of the subject, the right and left correction values, and the amount of fog. The image 323 may be displayed on the display unit 320. For example, in the present embodiment, when the non-measurement eye is fogged, the appearance of the non-fogged measurement eye may be displayed on the display unit 320 as the appearance of both eyes. In this case, the control unit 370 may cause the display unit 320 to display an image of a clear test target that can be seen by the measurement eye as the simulation image 323.

Note that the control unit 370 may display simulation images showing the appearance of each of the left and right sides. For example, as shown in FIG. 12, the control unit 370 may cause the display unit 320 to display a simulation image 324 showing the appearance with the right eye, a simulation image 325 showing the appearance with the left eye, and the like. For example, when the non-measurement eye is fogged in the one-eye examination, the control unit 370 may display a blurred test target image as a simulation image of how the non-measurement eye looks. For example, the control unit 370 may display an image that has been subjected to blurring processing or the like according to the amount of fog. The image displayed as the simulation image may be stored in advance in the storage unit 340 or the like, or may be generated by the control unit 370.

The degree of blurring of the simulation images 323, 324, and 325 may be changed in accordance with changes in the correction power, the amount of fog, and the like. For example, when the amount of fog is increased, it may be changed to a more blurred image, and when the amount of fog is decreased, it may be changed to a clearer image. Thereby, the examiner can easily confirm the change in the appearance of the subject due to the change in the frequency.

The control unit 370 may display the optotype image 322 of the inspection optotype to be displayed on the optotype presenting unit 210. The examiner can grasp whether or not the examinee can clearly see the optotype by comparing the optotype image 322 with another simulation image.

As described above, by displaying the simulation image 323 showing the appearance with both eyes on the display unit 320, it is possible to easily confirm how the subject looks. For example, conventionally, when a test is performed by applying a cloud, the examiner may actually look into the optometry apparatus 100 to check how the target is viewed. However, the appearance of the examiner and the appearance of the subject during measurement may be different due to the influence of the binocular vision abnormality of the examiner himself. In this case, it was difficult for the examiner to visualize the appearance of the examinee. Therefore, in the present embodiment, instead of displaying a simulation image for each eye for each target eye, an image assuming that the retinal images of the left and right eyes are fused is displayed on the display unit 320. This made it easier to visualize the common appearance with the subject. Further, by displaying the simulation image showing the appearance, the examiner can perform the inspection while imagining the appearance of the subject.

Note that the image displayed as the simulation image in the case of being fogged may be subjected to blurring processing such as lowering the brightness or increasing the exposure value according to the correction degree. The blurring process may be, for example, a process of changing colors, a process of mixing, a process of removing colors, a process of changing brightness, or the like. Alternatively, an image captured by optically blurring may be acquired.

Note that the control unit 370 may display the eye view 326 on the display unit 320 as illustrated in FIG. 12, for example. The eye diagram 326 is, for example, a ray diagram showing how the target luminous flux is incident on the measurement eye and the non-measurement eye that is clouded. As magnified in FIG. 14, an eye view 326 is depicted by the eye and lens diagram. As shown in FIG. 14A, for example, a correction lens (for example, a concave lens) P1 is arranged in the measurement eye, and a state in which the target light flux forms an image on the retina is depicted. On the other hand, a clouding lens (for example, a convex lens) Q1 is arranged on the non-measurement eye in addition to the correction lens P2, and a state in which the target light flux forms an image in front of the retina is depicted. By displaying the eye view 326 on the display unit 320 in this manner, the examiner can easily assume the appearance of the subject. The amount of fog F may be displayed near the fog lens Q1.

Similar to the simulation image described above, in the eye view 326, the image formation position of the visual target light flux may be changed in accordance with the change in the lens power arranged in the optometry window 160. For example, when the cloud amount is increased, the control unit 370 changes the display so that the cloud lens Q2 is further arranged in the non-measurement eye of the eye diagram 326 and the image formation position K of the target luminous flux moves to the front. It may be (see FIG. 14(b)). On the contrary, when the amount of fog is reduced, the number of lenses for fog is reduced in the non-measurement eye of the eye diagram 326, and the display is changed so that the image formation position K of the optotype estimation moves to the fundus side. Good. At this time, the display of the numerical value of the fog amount F may be changed.

In this way, by changing the display of the eye chart 326 according to the change in the amount of fog, it is possible to easily confirm the appearance of the subject according to the change in frequency. Therefore, the examiner can easily confirm whether the degree of blurring of the appearance of the subject is increased or decreased by changing the frequency. Moreover, the explanation of the examination to the examinee can be made easy to understand.

In the present embodiment, the control unit 370 controls the display screen 321 to include the inspection target 322, the binocular appearance simulation image 323, the right eye appearance simulation image 324, the left eye appearance simulation image 325, and the eye view. 326 is displayed. The examiner can more easily visualize the appearance of the subject by confirming the relationship of at least one of these displays. However, the control unit 370 displays at least one of the inspection target 322, the binocular appearance simulation image 323, the right eye appearance simulation image 324, the left eye appearance simulation image 325, and the eye view 326. You may.

In the above description, the simulation image 323, the eye view 326, and the like are displayed on the display unit 320 of the controller 300, but the present invention is not limited to this. For example, a display terminal (for example, a tablet terminal, a smartphone, a notebook PC, a desktop PC, etc.) may display a simulation image or an eye view showing how it looks. With this, for example, even when the optometry apparatus 100 is not actually used, such as a training for operating the optometry apparatus 100, it is possible for the learner to easily understand how to see when the cloud is fogged.

100 optometry device 110 lens unit 200 optotype presenting device 300 controller 320 display unit 340 storage unit 370 control unit

Claims (4)

An optometry device for inspecting an eye to be inspected,
A pair of left and right lens units arranged in the optical path of the target light flux projected onto the subject, and changing the optical characteristics of the target light flux,
Control means for controlling the drive of the lens unit,
An acquisition unit that acquires a target visual acuity value during cloudy weather,
Wherein, visual acuity of the subject's eye during fogging is, so has been the target eyesight value acquired by the acquisition unit, and determines the amount of fogging for causing fogging the eye to be examined Optometry device. The acquisition means further acquires the visual acuity value of the subject,
The optometry apparatus according to claim 1, wherein the control unit determines the amount of fog based on the target visual acuity value acquired by the acquisition unit and the visual acuity value of the subject. An optometry device for inspecting an eye to be inspected,
A pair of left and right lens units arranged in the optical path of the target light flux projected onto the subject, and changing the optical characteristics of the target light flux,
Control means for controlling the drive of the lens unit,
An acquisition unit that acquires the visual acuity value of the subject,
The optometry apparatus according to claim 1, wherein the control unit corrects a cloud amount for clouding the eye to be inspected according to the visual acuity value acquired by the acquisition unit. An optometry program executed in an optometry apparatus for inspecting an eye to be inspected, which is executed by a processor of the optometry apparatus,
An acquisition step to acquire the target visual acuity value during cloudy weather,
A visual acuity value of the eye to be inspected at the time of clouding, so as to be the target visual acuity value acquired by the acquisition step, a determination step of determining the amount of fog to be added to fog the eye to be inspected,
An optometry program for causing the optometry apparatus to execute.