JP2020044198A - Optometer - Google Patents

Abstract

To provide an optometer which enables an examiner to observe an optotype presented to an eye to be examined, simultaneously with a subject.SOLUTION: An optometer comprises: an optometric unit 30 which is arranged on the front of an eye 2 to be examined and selectively arranges a plurality of optical elements 32 in front of the eye 2 to be examined, thereby allowing for correction of the visual function of the eye 2 to be examined; a camera 40 mounted on the optometric unit 30 and capable of photographing the front of the optometric unit 30; and a monitor 53 for displaying image data photographed by the camera 40.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an optometry apparatus.

  2. Description of the Related Art A subjective optometric apparatus that presents an optotype to an examinee and examines the visual function of the examinee's eye based on a response from the examinee regarding the appearance of the optotype is known. Conventionally, as such a subjective optometry apparatus, an optotype presenting optical system for presenting an optotype, a housing accommodating the optotype presenting optical system, and a light beam from the optotype provided on the housing and transmitting therethrough An optotype presenting device having a presenting window, and an optometrist arranged between the optotype presenting device and the eye to be examined and correcting the visual function of the eye to be examined are arranged in close proximity to each other, and the optotype is provided through the presenting window. 2. Description of the Related Art An optometry apparatus provided with an observation unit for observing a positional relationship between an optometer and an eye to be examined from the side of a presentation apparatus is known (for example, see Patent Document 1).

JP 2018-089078 A

  However, in the conventional optometric apparatus, even though the state of the examinee can be observed from the observation unit, the examiner cannot actually confirm the state of the presented target, and the examinee cannot observe the subject. The examinee and the examiner could not observe the optotype presented at the same time.

  The present invention has been made in view of the above problem, and has as its object to provide an optometric apparatus that allows an examiner to simultaneously observe a target presented to an examinee's eye with the examinee.

  To achieve the above object, the optometry apparatus of the present invention is arranged in front of the eye to be inspected, and enables correction of the visual function of the eye to be inspected by selectively disposing a plurality of optical elements in front of the eye to be inspected, An optometry unit for performing a subjective test, an imaging device attached to the optometry unit and capable of capturing an image in front of the optometry unit, and a display device for displaying image data captured by the imaging device.

  In the optometry apparatus configured as described above, the front of the optometry unit is photographed by the imaging device, and the image data of the optotype presented in front of the optometry unit can be displayed on the display device. Therefore, by visually recognizing the image data displayed on the display device, the examiner can observe the optotype presented to the subject's eye simultaneously with the subject.

FIG. 1 is a perspective view illustrating an entire configuration of an optometry apparatus according to a first embodiment. FIG. 3 is an explanatory diagram illustrating a target presenting unit of the optometry apparatus according to the first embodiment. FIG. 2 is a cross-sectional view illustrating an optometry unit of the optometry apparatus according to the first embodiment. FIG. 2 is a block diagram illustrating a control unit of the optometry apparatus according to the first embodiment. FIG. 3 is an explanatory diagram illustrating an optotype presented in the optometry apparatus according to the first embodiment. FIG. 4 is an explanatory diagram illustrating image data displayed on a monitor in the optometry apparatus according to the first embodiment. It is explanatory drawing which shows the relationship between the gaze angle in the optometry apparatus of Example 1, and the visual recognition state of an optotype, (a) shows the state where the eye to be inspected is higher than the optotype, and (b) shows the eye to be inspected than the optotype. (C) shows a state where the eye to be examined is lower than the target, (d) shows a state of the target when the eye to be examined is lower than the target, and (e) shows a state of the target when the eye is lower than the target. The figure shows a state where the height of the eye to be examined and the optotype match, and FIG. 7F shows the appearance of the optotype when the height of the eye to be examined matches the height of the optotype. FIG. 3 is a plan view illustrating a relationship between a target presenting unit and a camera in the optometry apparatus according to the first embodiment. FIG. 10 is a cross-sectional view illustrating an optometry unit of the optometry apparatus according to the second embodiment.

  Hereinafter, embodiments for implementing an optometry apparatus according to the present invention will be described based on Embodiments 1 and 2 shown in the drawings.

(Example 1)
A configuration of the optometry apparatus 10 according to the first embodiment will be described with reference to FIGS.

  The optometry apparatus 10 illustrated in FIG. 1 presents various optotypes to the subject 1 (see FIG. 2) and performs a subjective test performed based on a response of the subject 1 who has visually recognized the presented optotype. Things.

  The optometry apparatus 10 according to the first embodiment includes an optotype presenting unit 20, an optometry unit 30, a camera 40 (imaging device), and a control unit 50, as shown in FIG. Here, the optotype presenting unit 20 is installed on the floor surface 11. On the other hand, the optometry unit 30 is supported via an arm 14 on a column 13 that stands up from an optometry table 12 disposed between the optotype presenting unit 20 and the subject's eye 2.

  The arm 14 has a drive unit 14a that drives based on a drive command input from the control unit 50. The arm 14 is rotated by the driving unit 14a about the support 13 and moves vertically along the support 13. That is, the optometry unit 30 moves from the retreat position shown in FIG. 1 to the inspection position facing the optotype presenting unit 20 by the rotation of the arm 14. The vertical position of the optometry unit 30 is changed by moving the arm 14 in the vertical direction. The driving unit 14a for rotating or vertically moving the arm 14 has a driving source using a motor, a solenoid, or the like. A well-known configuration is used as a mechanism of the driving unit 14a. Further, the rotation and the vertical movement of the arm 14 may be manually performed.

  The optotype presenting unit 20 includes a hollow housing 21 standing upright from the floor surface 11 and an optotype presenting optical system 22 (see FIG. 2) housed in the housing 21. A window 21b in which a transparent polyacrylate resin is fitted is provided on a front surface 21a (a surface facing the subject 1) of the housing 21. The subject 1 visually recognizes the optotype image T projected at the optometry distance via the window 21b.

  The optotype presenting optical system 22 is an optical system that presents the optotype image T to the subject 1, and as shown in FIG. 2, an image display unit 23, a first reflection mirror 24, a lens system 25, It has a second reflection mirror 26 and a tilt mechanism 27.

  The image display unit 23 includes a display 23a that displays a target such as a Landolt ring, and a display control unit 23b. Here, the display 23a is configured by an electronic display device such as a liquid crystal display and an organic EL display. In addition, the display control unit 23b selects a target based on the selection instruction input from the main control unit 51 of the control unit 50, and outputs a command to display the selected target on the display 23a.

  The first reflecting mirror 24 reflects the light flux from the target displayed on the display 23 a of the image display unit 23 toward the lens system 25.

  The light beam reflected by the first reflecting mirror 24 forms a virtual image of a target by the lens system 25. Here, the lens system 25 is constituted by one lens or a plurality of lenses, and is inserted into and removed from the light flux from the display 23a reflected by the first reflection mirror 24 as necessary. The insertion and removal of the lens in the lens system 25 is performed by a drive mechanism (not shown) based on a command for switching between a far test and a near test input via the operation unit 52.

  The second reflection mirror 26 reflects and deflects the light beam transmitted through the lens system 25, and presents a virtual image of the target at a predetermined distance in front of the corneal vertex 3 of the eye 2. The second reflection mirror 26 is provided behind a window 21b provided on a front surface 21a of the housing 21. The second reflection mirror 26 is arranged on the optical axis of the lens system 25. The second reflection mirror 26 is rotatably held in the up-down direction by a tilt mechanism 27, and adjusts the angle of the optical axis (presentation optical axis 102 of the target image T) according to the eye height of the subject 1. It is possible to change.

  The tilting mechanism 27 is a mechanism that adjusts the optical axis (presentation optical axis 102 of the optotype image T) in accordance with the eye height of the subject 1, and the vertical angle of the second reflection mirror 26 in the housing 21. a holding unit 27a that holds θ in a changeable manner; and an angle control unit 27b that outputs an angle command to the holding unit 27a. Here, the range of the angle θ that can be held by the holding unit 27a is a range where the reflected light flux is ± 30 ° with respect to zero degree where the reflected light flux is arranged so as to be parallel to the floor surface 11. Further, the angle control unit 27b outputs an angle command to the holding unit 27a based on the angle θ instruction input from the main control unit 51 of the control unit 50.

  The optometry unit 30 is disposed between the optotype presenting unit 20 and the eye to be inspected 2, and selectively arranges a plurality of optical elements 32 having different refractive powers in front of the eye to be inspected 2, so that the eye to be inspected 2 can be viewed. Correction of function is possible. The optometry unit 30 is arranged in a pair in the left-right direction of the subject 1, and includes a hollow housing 31 and a plurality of optical elements 32 housed in the housing 31, as shown in FIG. ing. FIG. 3 shows one (the left side as viewed from the subject 1) optometry unit 30.

  The housing 31 is provided with a first optometry window 33a penetrating the first side surface 31a facing the optotype presenting unit 20, and a second optometry window 33b penetrating the second side surface 31b facing the subject 1. The first and second optometry windows 33a and 33b face each other, and when the subject 1 looks into the second optometry window 33b, the optotype presenting unit 20 can be visually recognized through the first optometry window 33a.

  The plurality of optical elements 32 are a spherical lens, a cylindrical lens, a prism, and the like. The plurality of optical elements 32 are attached to a disk-shaped lens disk 32a rotatably provided in the housing 31, and are arranged along the circumferential direction of the lens disk 32a. One of the plurality of optical elements 32 arranged in the circumferential direction is positioned between the first and second optometry windows 33a and 33b by rotating the lens disk 32a by the driving unit 32b. Thereby, in the optometry unit 30, the plurality of optical elements 32 are selectively arranged in front of the subject's eye 2, and the visual function of the subject's eye 2 when the optotype presenting unit 20 is visually recognized can be corrected. The drive unit 32b for rotating the lens disk 32a has a drive source using a motor, a solenoid, or the like. The drive source is used to set a prism power, a spherical power, and the like input via the operation unit 52. Drive based on the setting command. A well-known configuration is used as the mechanism of the drive unit 32b.

  The camera 40 is a photographing device that can photograph the optotype image T presented by the optotype presenting unit 20 through the window 21b. The camera 40 is fixed to a first side surface 31 a that is a front side of the housing 31 of the pair of optometry units 30 arranged in the left-right direction of the subject 1, and can capture an image in front of the optotype presenting unit 20. It is desirable that the camera 40 is arranged at the same height as the first optometry window 33a, but this is not a limitation. The camera 40 is, for example, a digital camera, and includes an imaging optical system 41 and an imaging element 42.

  The imaging optical system 41 is configured by a lens, and forms a subject image such as an optotype on the imaging element 42. The imaging element 42 converts the subject image formed by the imaging optical system 41 into image data (electric signals) and outputs the image data. As the image pickup device 42, for example, a charge coupled device (CCD) image sensor or a complementary metal oxide semiconductor (CMOS) image sensor is used.

  The drive control of the image sensor 42, that is, the control of the start and end of shooting in the camera 40, is performed based on a shooting instruction input via the operation unit 52. The image data output from the image sensor 42 is input to the main control unit 51 of the control unit 50.

  The camera 40 may be detachably attached to the housing 31 of the optometry unit 30. In this case, as a means for attaching the camera 40, a suction cup, an adhesive sheet, a hook-and-loop fastener or the like is used.

  The control unit 50 accepts an operation by the examiner (not shown), and appropriately outputs a command (control signal) corresponding to the operation to the optotype presenting unit 20, the optometry unit 30, and the camera 40, thereby causing the optometry apparatus 10 to operate. Manipulate. Here, the control unit 50, the optotype presenting unit 20, the optometry unit 30, and the camera 40 are communicably connected to each other by a general communication interface. The control unit 50 outputs various commands to the optotype presenting unit 20 and the like via the communication interface. Note that a general communication interface may be a wired interface or a wireless interface such as a wireless LAN or Bluetooth (registered trademark).

  As illustrated in FIG. 4, the control unit 50 is a main control unit 51 that comprehensively controls the entire operation of the optometry apparatus 10, an operation unit 52 operated by the examiner, and output from the main control unit 51. A monitor 53 (display device) for displaying various information. Here, the control unit 50 is configured by a notebook personal computer including an operation unit 52 and a monitor 53, and is mounted on the optometry table 12. Note that the control unit 50 is not limited to a notebook personal computer, and may be configured by a portable terminal (information processing device) such as a tablet terminal or a smartphone, or may be a controller dedicated to optometry. .

  The operation unit 52 includes, for example, an operation panel having a keyboard, a mouse, various switches and buttons, a dial, a trackball, and the like. By operating the operation unit 52 by the examiner, an instruction to select an optotype to be presented by the optotype presenting unit 20, an instruction to switch between distance optometry or near optometry, a prism power and a spherical power in the optometry unit 30, A setting command for setting a cylindrical power, an axis angle, a distance between pupils, a shooting command for starting or stopping shooting with the camera 40, a display command for displaying image data output from the image sensor 42, and the like are sent to the main control unit 51. Is input to

  The monitor 53 is configured by an electronic display device such as a liquid crystal display or an organic EL display, and can be visually recognized by an examiner. On the monitor 53, in addition to the image data input from the image sensor 42, information such as optometry parameters, a target command image (a target image image displayed on the display 23a), test information, test results, and the like are displayed. Is displayed. When the monitor 53 has a touch panel function, the function of the operation unit 52 may be included in the monitor 53.

  The main control unit 51 includes a CPU (Central Processing Unit) and a storage unit 51a such as a RAM, a ROM, and a hard disk. Various commands are input to the main control unit 51 via the operation unit 52, and image data captured by the camera 40 is input. The main control unit 51 controls the operation of each unit of the optometric apparatus 10 based on various commands input via the operation unit 52. Note that a computer program for controlling each unit of the optometry apparatus 10 is stored in the storage unit 51a in advance. The storage unit 51a stores various optometry parameters for optometry, optometry results, and the like in addition to the computer program.

  That is, the main control unit 51 outputs a drive command to the drive unit 14 a that drives the arm 14, moves the optometry unit 30 forward of the optotype presenting unit 20, and adjusts the optometry unit 30 according to the posture of the subject 1. Adjust the height of the. Further, the distance between the left and right optometry units 30 is adjusted according to the eye width (interpupillary distance) of the subject 1. Further, the main control unit 51 outputs a setting command to the drive unit 32b that controls the rotation of the lens disk 32a of the optometry unit 30, and controls the rotation angle of the lens disk 32a. Thereby, the optical element 32 arranged between the first and second optometry windows 33a and 33b is switched, and the correction of the visual function of the subject's eye becomes possible.

  Further, the main control unit 51 outputs a photographing command to the image sensor 42 and controls the driving of the image sensor 42 of the camera 40. Thus, the start of shooting by the camera 40 and the end of shooting are controlled. In addition, the main control unit 51 outputs a display command to the monitor 53 and causes the monitor 53 to display image data input from the image sensor 42. The main control unit 51 can also control the imaging optical system 41 of the camera 40 to perform focusing, zooming, and the like when shooting with the camera 40.

  Further, the main control unit 51 outputs a command for selecting an arbitrary target instructed by the examiner via the operation unit 52 to the display control unit 23b. Thereby, the display 23a displays the optotype selected based on the instruction from the display control unit 23b. The main control unit 51 outputs an angle command to the angle control unit 27b based on the designated angle θ. Thereby, the holding unit 27a controls the angle θ of the second reflection mirror 26 based on a command from the angle control unit 27b.

  Hereinafter, the operation and effect of the optometry apparatus 10 according to the first embodiment will be described separately for “optotype checking operation”, “optotype presenting position adjustment operation”, and “optotype distance adjustment operation of the optometry unit”.

[Target check action]
When performing the subjective examination of the eye 2 to be examined by the optometry apparatus 10 of the first embodiment, first, the examiner operates the operation unit 52 of the control unit 50 and specifies a target to be presented by the target presentation unit 20.

  Accordingly, the display control unit 23b of the optotype presenting unit 20 selects the indicated optotype and causes the display 23a to display the selected optotype. The luminous flux from the target displayed by the display 23a is reflected by the first reflecting mirror 24, refracted by the lens system 25, reflected by the second reflecting mirror 26, and in front of the vertex 3 of the cornea of the eye 2 to be examined. Presents a virtual image of the target. As a result, as shown in FIG. 5, the optotype image T is presented in the window 21b of the optotype presenting unit 20.

  The subject 1 visually recognizes the optotype image T through the second optometry window 33b, the optical element 32, and the first optometry window 33a of the optometry unit 30.

  On the other hand, when the examiner presents the optotype image T by the optotype presenting unit 20, the examiner operates the operation unit 52 to output a photographing command from the main control unit 51, and starts photographing by the camera 40. Here, the camera 40 is provided on the first side surface 31 a facing the optotype presenting unit 20 in the housing 31 of the optometry unit 30, and faces the front surface 21 a of the optotype presenting unit 20. For this reason, the window 21b provided on the front surface 21a of the optotype presenting unit 20 is photographed by the camera 40, and the optotype image T presented in the window 21b can be imaged. The image data captured by the camera 40 is output to the main control unit 51 of the control unit 50. When the examiner operates the operation unit 52, a display command is output from the main control unit 51, and image data is displayed on the monitor 53 as shown in FIG.

  As described above, in the optometry apparatus 10 of the first embodiment, the optotype image T presented by the optotype presenting unit 20 is visually recognized by the subject 1 via the optometry unit 30, while the presented optotype image T Can be photographed by the camera 40 provided in the optometry unit 30, and the image data can be displayed on the monitor 53. Therefore, the examiner can observe the state of the optotype image T presented by the optotype presenting unit 20 simultaneously with the subject 1 by checking the image data displayed on the monitor 53.

  Thereby, the examiner can perform the examination of the eye 2 while confirming whether the optotype indicated by the examiner is surely presented. In particular, the optotype presenting optical system 22 of the optotype presenting unit 20 presents the optotype displayed on the image display unit 23 to the distant place using the optical system, thereby allowing the optometric unit 30 to be transmitted to the optotype presenting unit 20. They can be arranged close to each other, so that space can be saved. On the other hand, the gap created between the optotype presenting unit 20 and the optometric unit 30 becomes narrow. Therefore, it is difficult for the examiner to peek at the optotype image T presented by the optotype presenting unit 20 over the subject 1. However, photographing the optotype image T by the camera 40 attached to the optometry unit 30 enables the examiner to directly check the optotype image T even in a situation where it is difficult for the examiner to directly check the optotype image T. The state can be reliably observed.

[Adjustment of target presentation position]
In the optometry apparatus 10 of the first embodiment, the height of the optotype presenting unit 20 is fixed, and the height of the second reflection mirror 26 cannot be changed. On the other hand, the height of the subject's eye 2 varies depending on the physique of the subject 1. Therefore, depending on the height of the subject's eye 2, the optotype presenting unit 20 looks down or looks up.

  Originally, as shown in FIG. 7E, the height of the second reflection mirror 26 and the height of the eye to be inspected 2 match, and the visual axis 101 of the eye to be inspected 2 is reflected by the second reflection mirror 26 to present the optical axis of the target image T. It is desirable to match with 102. In this case, the optotype image T is presented in front of the subject's eye 2, and as shown in FIG. 7F, the subject 1 presents the optotype image T almost at the center of the window 21b. Looks like.

  However, as shown in FIG. 7A, for example, in the case of the subject 1 having a high sitting height, the subject's eye 2 looks down at the optotype presenting unit 20, and the line of sight 101 is directed downward with respect to the presented optical axis 102. Become. For this reason, as shown in FIG. 7B, the subject 1 appears to present the optotype image T above the window 21b, and when the sitting height is higher, the optotype image T is shaded. It may not be visible. Further, as shown in FIG. 7C, in the case of the subject 1 having a low sitting height, the subject's eye 2 looks up at the optotype presenting unit 20, and the line of sight 101 is directed upward with respect to the presented optical axis 102. . For this reason, as shown in FIG. 7D, the subject 1 appears to present the optotype image T below the window 21b. Similarly, when the sitting height is further low, the optotype image T is cast. May be used.

  On the other hand, the height of the optometry unit 30 can be adjusted to the height of the subject's eye 2 by moving the arm 14 in the vertical direction. In the optometry apparatus 10 according to the first embodiment, the optotype image T is captured by the camera 40, and the camera 40 is provided in the housing 31 of the optometry unit 30. Therefore, it is possible to take an image with the camera 40 from the same height as the eye 2 to be inspected. Further, the camera 40 is configured to be able to simultaneously observe the optotype image T reflected by the second reflection mirror 26 and a part of the housing 21 of the optotype presenting unit 20.

  Here, as described above, since the height position of the optotype presenting unit 20 is fixed, the height of a part of the image of the housing 21 of the optotype presenting unit 20 in the image data captured by the camera 40 is: The height of the optometry unit 30 can be determined. The distance between the optometry unit 30 and the optotype presenting unit 20 is known when these units are installed. Therefore, the optimum angle θ of the second reflecting mirror 26 can be obtained from the height of the optometry unit 30 obtained based on the image data obtained from the camera 40. In addition, a mark that can clearly detect the height, for example, a horizontal line or the like may be provided on a portion of the housing 21 photographed by the camera 40.

  That is, the main control unit 51 calculates the optimum angle θ of the second reflection mirror 26 based on the image data captured by the camera 40, and controls the angle control unit 27b to set the second reflection mirror 26 at the optimum angle. Drive to θ. Thus, conventionally, a light projecting unit using a remote controller or the like is arranged at the eye elevation position of the subject 1, and the sensor arranged in the optotype presenting unit 20 detects the eye elevation and detects the angle of the second reflection mirror 26. is controlled, but the eye level position can be detected without disposing the light projecting part at the eye level position.

  Further, in the optometry apparatus 10 of the first embodiment, the cameras 40 are attached to the respective housings 31 of the pair of optometry units 30, and the optotype images T are photographed by the two cameras 40. Here, each camera 40 is fixed to the side of the first optometry window 33a, and is arranged in the horizontal direction. That is, in the optometry apparatus 10, the same optotype image T (the same portion) presented to the optotype presenting unit 20 can be photographed from two different directions by the two cameras 40 arranged in the horizontal direction.

  Therefore, the distance L from the housing 31 of the optometry unit 30 to which the camera 40 is fixed to the optotype position O (see FIG. 8) based on parallax information based on two or more images taken from different directions by the cameras 40. Can be requested.

  Here, at the time of the distance examination, the target position O where the virtual image of the target is presented is set to about 4 to 6 m from the corneal vertex 3 of the eye 2 to be inspected. Therefore, even if a slight error occurs, the influence on the inspection result is small. However, in the near vision examination, the target position O is set to be about 30 to 40 cm from the corneal vertex 3. Therefore, if the target position O is shifted, the result of the inspection is affected, and an accurate inspection may not be performed.

  On the other hand, the optometry apparatus 10 according to the first embodiment determines the distance L from the housing 31 of the optometry unit 30 to the optotype position O from two image data captured by the two cameras 40 arranged in the horizontal direction. And the distance to the subject can be checked. Therefore, the examiner can objectively check the optotype position O where the virtual image of the optotype as the subject is presented. Therefore, the position of the optotype image T can be appropriately adjusted. Moreover, at this time, by using the subject as a visual target for near eye examination, an accurate inspection can be performed in the near vision inspection.

[Adjustment of interpupillary distance of optometry unit]
In the optometry apparatus 10 according to the first embodiment, the optotype presenting optical system 22 of the optotype presenting unit 20 uses the optotype image of the optotype displayed by the image display unit 23 via the first reflection mirror 24 and the second reflection mirror 26. Present T. Here, the second reflection mirror 26 includes a tilting mechanism 27 that makes the angle θ of the reflection surface variable. Therefore, the camera 40 can take an image of the optometry unit 30 reflected on the second reflection mirror 26 by causing the reflecting surface to substantially face the optometry unit 30 by the tilt mechanism 27.

  Therefore, for example, the camera 40 can simultaneously photograph the subject's eye 2 looking through the second optometry window 33d and the first optometry window 33a of the optometry unit 30.

  Thus, by displaying image data obtained by photographing the eye to be examined 2 and the first optometry window 33a on the monitor 53 of the control unit 50, if the examiner visually recognizes the monitor 53, the examinee's eye 2 and the first optometry window 33a are displayed. Can be objectively confirmed with respect to the positional relationship. Then, the examiner can adjust the horizontal position of the pair of optometry units 30 with respect to the left and right eyes 2 using the image data. Then, the left-right distance between the pair of optometry units 30 can be adjusted such that the pupils of the left and right eyes 2 and the first optometry windows 33a coincide with each other. Accordingly, even if the space between the optometry unit 30 and the optotype presenting unit 20 is small and the state of the subject's eye 2 cannot be observed from the front of the optometry unit 30, it is possible to adjust the position of the optometry unit 30.

(Example 2)
The optometric apparatus according to the second embodiment confirms the corneal position of the eye 2 to be examined and the optotype image T presented by the optotype presenting unit 20 using the same camera 40. Hereinafter, the configuration of the optometry unit 30A of the optometry apparatus according to the second embodiment will be described with reference to FIG. In addition, about the structure similar to the optometry unit 30 of Example 1, the same code | symbol as Example 1 is attached and detailed description is abbreviate | omitted.

  A pair of optometry units 30A in the optometry apparatus of Embodiment 2 are arranged side by side in the left-right direction of the subject 1, each having a hollow housing 31A, a plurality of optical elements 32 housed in the housing 31A, and a corneal position confirmation mechanism. 35. FIG. 9 shows one (the left side as viewed from the subject 1) optometry unit 30A.

  The housing 31 </ b> A is provided with a first optometry window 33 a penetrating the first side surface 31 a facing the optotype presenting unit 20 and a second optometry window 33 b penetrating the second side surface 31 b facing the subject 1.

  Further, the housing 31A is provided with a first observation window 35a on a first side surface 31a facing the optotype presenting unit 20. The first observation window 35a is located in the transmission direction of the half mirror 35e of the corneal position confirmation mechanism 35 described later, and penetrates the first side surface 31a. The first observation window 35a is provided beside the first optometry window 33a, and it is desirable that the center height of the first observation window 35a coincides with the center height of the first optometry window 33a. .

  On the other hand, on the second side surface 31b of the housing 31A facing the subject 1, a protruding surface 31c protruding to the side of the subject's eye 2 is formed. A second observation window 35b for observing the subject's eye 2 is provided on the protruding surface 31c. Further, a light source 35c that illuminates the corneal vertex 3 of the subject's eye 2 is provided at a position adjacent to the second observation window 35b on the protruding surface 31c. The light source 35c is configured by an LED (Light Emitting Diode) or the like.

  The corneal position confirmation mechanism 35 is a mechanism used for confirming the distance between the corneal vertex 3 of the eye 2 to be examined and the optometry unit 30 at the time of optometry. The corneal position confirmation mechanism 35 has an aiming scale 35d and a half mirror 35e (optical member).

  The aiming scale portion 35d is a transparent plate material that is scaled by engraving, printing, or the like. The aiming scale 35d is arranged on the optical path of the corneal position observation system in the housing 31A via the second observation window 35b.

  The half mirror 35e is a dichroic mirror that reflects light (light of a specific wavelength) from the eye 2 and transmits light of other wavelengths. The half mirror 35e is arranged on the optical path of the corneal position observation system in the housing 31A via the aiming scale 35d. Here, the half mirror 35e reflects the light from the subject's eye 2 toward the second side surface 31b of the housing 31A. For example, by configuring the light source 35c with an LED that emits near-infrared light, illuminating the cornea with near-infrared light, and configuring the half mirror 35e with a dichroic mirror that reflects infrared light and transmits visible light. The image of the cornea illuminated with infrared light can be reflected by the half mirror 35e and photographed by the camera 40. On the other hand, visible light from the optotype image T can be transmitted through the half mirror 35e and photographed by the camera 40, and loss of light amount can be reduced.

  The camera 40 is attached to the inner surface of the second side surface 31b of the housing 31A, and is housed in the housing 31A. Further, the camera 40 is arranged in a transmission direction of the half mirror 35e and at a position facing the first observation window 35a. This allows the camera 40 to transmit through the half mirror 35e and capture an image via the first observation window 35a.

  Thus, in the optometry apparatus of the second embodiment, when the light source 35c is turned on, light from the subject's eye 2 enters the housing 31A via the second observation window 35b. This light is reflected by the half mirror 35e and can be photographed by the camera 40. That is, the examiner can check the position of the corneal vertex 3 based on the image data captured by the camera 40.

  For this reason, as in a space-saving optometry apparatus in which the distance between the optotype presenting unit 20 and the optometry unit 30 is small, the first observation window 35a cannot be seen from the first side surface 31a side (in front of the optometry unit 30A) of the housing 31A. Even so, since the position of the corneal vertex 3 can be confirmed from the image, the distance between the corneal vertex 3 of the subject's eye 2 and the optometric unit 30 can be easily grasped.

  On the other hand, if the light source 35c is turned off, the light from the subject's eye 2 decreases, and the camera 40 can photograph the front of the optometry unit 30A via the half mirror 35e and the first observation window 35a. Here, an optotype presenting unit (not shown) similar to the first embodiment is installed in front of the optometry unit 30A, and the camera 40 captures an optotype image T presented by the optotype presenting unit. can do.

  In addition, as shown by a two-dot chain line in FIG. 9, first and second light-shielding portions are provided before and after the half mirror 35 e so that the image obtained by capturing the corneal vertex 3 does not overlap the image obtained by capturing the optotype image T. Alternatively, the second shutters S1 and S2 may be arranged so that light from the side not to be observed does not enter the camera 40. In this case, when confirming the position of the corneal vertex 3, the first shutter S1 is closed and the second shutter S2 is opened. When observing (photographing) the optotype image T, the first shutter S1 is opened and the second shutter S2 is closed. Here, only one of the first and second shutters S1 and S2 may be provided.

  Further, as shown by the two-dot chain line in FIG. 9, by arranging the half mirror 35 e inverted by 90 °, the light beam 104 from the optotype image T passes through the half mirror 35 e through the first observation window 35 a, An image can be taken with the camera 40. Further, by inverting the half mirror 35e by 90 °, the light from the subject's eye 2 is reflected by the half mirror 35e and the examiner moves the position of the corneal vertex 3 through the first observation window 35a as in the related art. Can be observed directly. In this case, as the half mirror 35e, a mirror that reflects and transmits visible light at a constant rate is used.

  Further, when the half mirror 35e is constituted by a quick return mirror that can be inserted into and removed from the optical path of the corneal position observation system, the half mirror 35e is inserted into the optical path of the corneal position observation system when confirming the position of the corneal vertex 3. Is inserted, and when the optotype image T is observed (photographed) by the camera 40, the target can be removed from the optical path of the corneal position observation system. In this case, since the half mirror 35e can be a total reflection mirror, it is possible to prevent a loss of light amount.

  Moreover, the camera 40 is arranged at a position facing the first observation window 35a, but the first observation window 35a is provided on the side of the first optometry window 33a. Here, if the center height of the first observation window 35a and the center height of the first optometry window 33a match, the camera 40 captures the optotype image T from a position substantially the same as the eye 2 to be examined. Can be. Therefore, the examiner can confirm the optotype image T while the subject 1 is looking at the image data captured by the camera 40 on the monitor 53.

  As described above, the optometry apparatus according to the present invention has been described based on the first embodiment and the second embodiment. However, the specific configuration is not limited to these embodiments, and each claim is set forth in the claims. Changes or additions to the design are permitted without departing from the gist of the present invention.

  In the first embodiment, the cameras 40 are attached one by one to the pair of optometry units 30 arranged in the left-right direction of the subject 1, but are not limited thereto. For example, the camera 40 may be attached to only one of the pair of optometry units 30, or only one camera 40 may be attached to the center position of the pair of optometry units 30. Further, a plurality of cameras 40 may be provided around the first optometry window 33a. Furthermore, since it is sufficient that the camera 40 can capture the optotype image T from the optometry unit 30, the camera 40 may be provided at an arbitrary position such as the tip of the arm 14 that supports the optometry unit 30.

  In the first embodiment, an example is described in which the angle θ of the second reflection mirror 26 is adjusted based on an operation command from the examiner who has visually recognized the image data, but is not limited thereto. For example, the main controller 51 analyzes the image data, and calculates a line-of-sight angle 103 formed by the line of sight 101 directed from the subject's eye 2 to the optotype image T and the presented optical axis 102 of the second reflection mirror 26. Then, the angle θ is calculated based on the line-of-sight angle 103 obtained by the calculation, and an angle command corresponding to the calculated angle θ is output, so that the angle θ of the second reflection mirror 26 is automatically adjusted. It may be.

  In the first embodiment, the example in which the presentation optical axis 102 is changed by the tilt mechanism 27 has been described. However, the present invention is not limited thereto. For example, a mechanism for changing the height itself of the optotype presenting unit 20 may be provided, and the present optical axis 102 may be adjusted by changing the height of the optotype presenting unit 20 using this mechanism.

  Further, the adjustment of the interpupillary distance and the adjustment of the display position of the optotype image T are automatically required from the main control unit 51 based on the information obtained by analyzing the image data captured by the camera 40. Command may be output and the necessary adjustment may be made automatically.

  In the first and second embodiments, the optometry apparatus 10 includes the optotype presenting unit 20 and the camera 40 captures the optotype image T presented by the optotype presenting unit 20. However, it is not limited to this. For example, in the case of presenting the optotype for the near optometry, the optical system for presenting the optotype can be unnecessary, so the optometry apparatus 10 does not need to include the optotype presenting unit 20. Good.

REFERENCE SIGNS LIST 1 subject 2 eye to be examined 10 optometry apparatus 20 optotype presenting unit 22 optotype presenting optical system 23 image display unit 24 first reflection mirror 25 lens system 26 second reflection mirror 27 tilt mechanism (mechanism for adjusting optical axis)
Reference Signs List 30 optometry unit 31 housing 32 optical element 33a first optometry window 33b third optometry window 35 cornea position confirmation mechanism 35a first observation window 35b second observation window 35c light source 35d aiming graduation section 35e half mirror 40 camera (imaging device)
50 control unit 51 main control unit 52 operation unit 53 monitor (display device)
101 Line of sight 102 Presenting optical axis 103 Line of sight angle T Target image θ Angle

Claims (9)

In the optometry unit that arranges in front of the subject's eye, enables correction of the visual function of the subject's eye by selectively arranging a plurality of optical elements in front of the subject's eye, and performs a subjective test,
An imaging device attached to the optometry unit and capable of capturing an image in front of the optometry unit,
A display device for displaying image data photographed by the photographing device;
An optometric apparatus comprising: In front of the optometry unit, an optotype presenting unit having an optotype presenting optical system for presenting an optotype image is arranged,
The optometry apparatus according to claim 1, wherein the imaging device captures an optotype image presented in the optotype presenting unit. The optotype presenting optical system has a mechanism for adjusting the optical axis in accordance with the eye height of the subject,
The photographing apparatus photographs the optotype image and the optotype presenting unit presented in the optotype presenting unit,
The optometry apparatus according to claim 2, wherein the mechanism for adjusting the optical axis enables the optical axis to be adjusted based on image data captured by the imaging device. The optometry apparatus according to any one of claims 1 to 3, wherein the imaging device is arranged at the same height as an optometry window of the optometry unit. The optometry apparatus according to any one of claims 1 to 4, wherein a plurality of the imaging devices are provided. The plurality of photographing devices are arranged at different positions of the optometry unit, and photograph the same front part,
The optometry apparatus according to claim 5, wherein image data taken by two or more different photographing apparatuses is analyzed, and a distance to a subject can be confirmed. The optometry apparatus according to claim 6, wherein the subject is a visual target for near optometry. The optometry unit has an observation window for confirming the distance between the optometry unit and the subject's eye from the front of the optometry unit,
The optometry apparatus according to any one of claims 1 to 7, wherein the imaging apparatus is configured to be able to take an image of the front of the optometry unit via the observation window. The imaging device is configured to be capable of capturing an image in front of the optometry unit via the observation window, and to be able to acquire image data for confirming a distance between the optometry unit and the subject's eye. An optometry apparatus according to claim 8, wherein