JP2024045973A - Binocular Measurement Device - Google Patents

Abstract

[Problem] To provide a small binocular measurement device having a subjective refraction test function and an objective refraction test function. [Solution] The binocular measurement device includes a subjective refraction test section arranged in an optical path in the line of sight of the eye to be examined, an objective refraction test section arranged in an optical path separated from the optical path in the line of sight in a direction different from the line of sight, a left lens barrel and a right lens barrel that respectively accommodate a part of the subjective refraction test section on the side of the eye to be examined and the objective refraction test section, a connecting section that is connected to the left lens barrel and the right lens barrel on the side opposite the side of the eye to be examined and accommodates a part of the subjective refraction test section on the side opposite the side of the eye to be examined, and an adjustment section that has a function of adjusting the distance between the left lens barrel and the right lens barrel by a link mechanism. [Selected Figure] Figure 3

Description

The present disclosure relates to a binocular measuring device.

Measurement devices for measuring the visual acuity of a subject's eye have been proposed in the past. For example, Patent Document 1 discloses a visual acuity display device equipped with an index presentation optical system that presents an eye test target to the subject's eye. This visual acuity display device displays an eye test target, which is a Landolt ring, on a display screen, and tests whether the subject can recognize the target, thereby measuring the visual acuity.

Patent No. 5835838

The apparatus of Patent Document 1 assumes that the test subject is examined in a seated state. Further, since the distance from the subject to the device and the optical path of the index presentation optical system within the device are long, a large amount of space is required to install the device. Measuring devices for measuring visual acuity are desired to have multiple functions.

The present disclosure aims to provide a compact binocular measurement device that has both subjective and objective refraction testing functions.

In order to achieve the above object, a binocular measuring device according to the present disclosure includes a subjective refraction testing section disposed in an optical path in the visual line direction of the eye to be examined, and a direction different from the visual line direction from the optical path in the visual line direction. a left mirror that accommodates an objective refraction testing section disposed in a light path split into a light path, a part of the subjective refraction testing section on the eye to be examined side, and the objective refraction testing section, respectively; The tube and the right lens barrel are connected to the left lens barrel and the right lens barrel on the side opposite to the eye to be examined, and a part of the subjective refraction test section on the side opposite to the eye to be examined. The lens includes a connecting portion for accommodating the lens, and an adjusting portion having a function of adjusting the distance between the left lens barrel and the right lens barrel using a link mechanism.

According to the ophthalmologic apparatus according to the present disclosure, it is possible to provide a small-sized binocular measurement device having a subjective refraction test function and an objective refraction test function.

1 is an overall perspective view schematically showing a binocular measuring device according to a first embodiment; FIG. 1 is a front view of a binocular measuring device according to Embodiment 1. FIG. 1 is a diagram showing a configuration of an optical system of a binocular measurement apparatus according to a first embodiment. FIG. 3 is a diagram showing the configuration of a reflex measuring section. FIG. 3 is a control block diagram of the binocular measuring device. 3 is a diagram showing the configuration of an optical system of a binocular measuring device according to a second embodiment. FIG.

(Embodiment 1)
Hereinafter, the first embodiment of the present disclosure will be described with reference to the drawings. FIG. 1 is an overall perspective view showing a binoculars measurement device 1A (1). The binocular measurement device 1A has a housing shaped like binoculars. The binocular measurement device 1A is formed to a size and weight that allows a subject to hold or carry it with one or both hands. The binocular measurement device 1A includes a left lens barrel 2 and a right lens barrel 3, and a connecting portion 4 connected to the left lens barrel 2 and the right lens barrel 3. The connecting portion 4 of the first embodiment also functions as an MC portion (miracle chart portion).

The left and right barrels 2 and 3 have a substantially cylindrical housing. The left and right barrels 2 and 3 have eyepieces 21 and 31 at one end for bringing the subject's eye E (see FIG. 3) into contact with the eyepieces 21 and 31. The left and right barrels 2 and 3 are connected to the connecting section 4 at the other end opposite the eyepieces 21 and 31 (subject's eye E). The binocular measurement device 1A also includes an adjustment section 5 that has the function of adjusting the distance between the left and right barrels 2 and 3 by a link mechanism. The adjustment section 5 includes a first link member 51 fixed to the left barrel 2, a second link member 52 fixed to the right barrel 3, and a pivot shaft 53 that rotatably connects the first link member 51 and the second link member 52. The left and right barrels 2 and 3 can be rotated around the axis P of the pivot shaft 53 by the adjustment section 5. Therefore, the left and right barrels 2 and 3 can move the distance W between the eyepiece 21 of the left barrel 2 and the eyepiece 31 of the right barrel 3 in a direction toward or away from each other. The subject can adjust the distance W between the left and right barrels 2 and 3 by using the adjustment unit 5 so that the positions of the left and right optotypes (e.g., optotype 611) overlap when looking through the eyepieces 21 and 31. For example, a circular figure is used as the indicator to be displayed at this time. The distance W between the left and right barrels 2 and 3 is adjusted by the subject holding and moving the left and right barrels 2 and 3. The rotating shaft 53 and the like are provided with a dial for setting the rotation angle between the first link member 51 and the second link member 52, and the subject may adjust the distance W between the left and right barrels 2 and 3 by rotating the dial to rotate the first link member 51 and the second link member 52 around the axis P.

FIG. 3 is a diagram showing the configuration of the optical system of the binocular measuring device 1A. The binocular measurement device 1A includes a subjective refraction testing section 6A (6) disposed in the optical path of the eye E of the subject in the approximate direction of the line of sight D1, and a part other than the optical path in the direction of the line of sight D1 that is different from the direction of the line of sight D1. and an objective refraction testing section 7 disposed on an optical path split in direction D2. The line-of-sight direction D1 and the other direction D2 are directions that are substantially perpendicular to each other. The subjective refraction testing section 6A includes an optotype 611, a condensing lens 62, a half mirror 63, and a CV lens 64. The connecting portion 4 accommodates a portion of the subjective refraction testing portion 6A on the side opposite to the eye E side. In this embodiment, the connecting portion 4 accommodates an optotype 611 (image display device 61) and a condensing lens 62.

The optotype 611 indicates the position of the optotype image displayed on the image display device 61 (details not shown) provided in the connecting portion 4. The image display device 61 is configured by, for example, a liquid crystal display device. The image display device 61 also displays an optometry image such as a Landolt ring as an optotype image.

The condenser lens 62 splits the light of the index image emitted from the visual target 611 into light corresponding to the left and right test eyes E, and guides the light to the left lens barrel 2 and the right lens barrel 3, respectively. The light incident on the left lens barrel 2 and the right lens barrel 3 from the condenser lens 62 is guided to each half mirror 63.

The half mirror 63 is housed in the left lens barrel 2 and the right lens barrel 3, respectively, together with the objective refraction testing section 7 and the CV lens 64. The half mirror 63 transmits part of the incident light and reflects the other part of the light. Note that the transmittance, reflectance, cut-on wavelength, and cut-off wavelength of the half mirror 63 can be set arbitrarily. The half mirror 63 transmits the light collected by the condensing lens 62 and guides it to the CV lens 64 . Further, the half mirror 63 has a function of reflecting the test light emitted from the objective refraction testing section 7 toward the eye E to be examined, and reflecting the reflected light reflected by the eye E to the objective refraction testing section 7. has.

The CV lens 64 refracts the light that has passed through the half mirror 63 (condenses the light using positive or negative lens power) and guides the light to the eye E to be examined. The left lens barrel 2 and the right lens barrel 3 accommodate at least a portion of the subjective refraction testing section 6A on the eye E side and the objective refraction testing section 7, respectively. In this embodiment, the optotype 611 and the condensing lens 62 are housed in the connecting portion 4 . Therefore, the condenser lens 62 separates the light emitted from the optotype 611 and incident on the half mirror 63 of the left lens barrel 2 and the light emitted from the optotype 611 and incident on the half mirror 63 of the right lens barrel 3. , respectively.

The CV lenses 64 (the left CV lens 64L and the right CV lens 64R) are a phoropter optical system. The CV lens 64 arranges one or more lenses selected from a plurality of lenses on the optical path between the half mirror 63 and the eyepieces 21 and 31, and automatically or manually sets an arbitrary refractive index. configured as possible. Since the refractive index (lens power) of the CV lens 64L and the CV lens 64R is configured to be individually adjustable, the left and right eyes E and the optotype 611 are individually focused by the CV lens 64.

By configuring the subjective refraction testing section 6A in this manner, the subject can position the optotype image of the optotype 611 at a position farther away than it actually is (for example, at a position 5 m from the eyepieces 21 and 31). It can be visually recognized as a placed visual target 611'.

In this embodiment, the objective refraction testing section 7 is configured by a reflex measuring section 700 (refractometer). FIG. 4 is a configuration diagram of the reflex measuring section 700. The reflex measurement section 700 includes a measurement optical system 710 and a measurement unit 720, as shown in FIG.

The measurement optical system 710 includes an objective lens 711, a rotating prism 712, a beam splitter 713, a plurality of relay lenses 714, 716, 717, 719, an iris diaphragm 715, and a reflection mirror 718.

The measurement unit 720 includes a measurement light projection light source 721 and a measurement light receiving optical system 722. The measurement light projection light source 721, together with a relay lens 716, an iris diaphragm 715, a relay lens 714, a beam splitter 713, a rotating prism 712, an objective lens 711, and a half mirror 63, projects a predetermined pattern of measurement light onto the eye E (pupil and fundus). It constitutes an irradiation optical system that irradiates. The iris diaphragm 715 has a conjugate relationship with the pupil of the eye E to be examined. Further, the measurement light projection light source 721 is in a conjugate relationship with the fundus of the eye E to be examined. The rotating prism 712 constantly rotates during measurement of the eye E to be examined so as to scan the irradiation position of the eye E to be examined with the measurement light.

The measurement unit 720 includes a variable cross cylinder 723, an imaging lens 724, a Hartmann plate 725, and a light receiving element 726 as a light receiving section. The imaging lens 724 functions as a focusing optical member that adjusts the state of the light flux in order to focus the reflected light from the eye E to be examined.

The Hartmann plate 725 functions as a splitting optical element that splits the measurement light beam from the imaging lens 724 into multiple light beams. The variable cross cylinder 723, the imaging lens 724, the Hartmann plate 725, and the light receiving element 726, together with the half mirror 63, the objective lens 711, the rotating prism 712, the beam splitter 713, the relay lens 717, the reflecting mirror 718, and the relay lens 719, constitute the measurement light receiving optical system 722.

The Hartmann plate 725 is composed of, for example, an evenly spaced microlens plate. When a parallel light beam is incident on the Hartmann plate 725, an evenly spaced lens array image (details not shown) is formed on the light receiving element 726. When the measurement light beam from the subject's eye E is incident on the Hartmann plate 725 in a myopic relationship, the image spacing of the lens array image is narrower than the grid spacing of the microlens plate. When the measurement light beam from the subject's eye E is incident on the Hartmann plate 725 in a hyperopic relationship, the image spacing of the lens array image is wider than the grid spacing of the microlens plate. Therefore, the binocular measurement device 1A can determine the condition of the subject's eye E by detecting the image spacing of the lens array image.

Figure 5 is a control block diagram of the binocular measurement device 1A (1). The binocular measurement device 1A includes a control unit 101, a memory unit 102, an input unit 103, and an output unit 104.

Although not shown, the control unit 101 executes functions and/or methods realized by codes or instructions included in programs stored in each storage unit 102. The control unit 101 includes, for example, a central processing unit (CPU), MPU, GPU, microprocessor, processor core, multiprocessor, ASIC, FPGA, etc., and is implemented by a logic circuit or a dedicated circuit formed in an integrated circuit or the like in each embodiment. You may implement each process disclosed in . Furthermore, these circuits may be realized by one or more integrated circuits, and a plurality of processes shown in each embodiment may be realized by one integrated circuit. Although not shown, the control unit 101 may include a main storage unit that temporarily stores programs read from the storage unit 102 and provides a work area for the control unit 101. The control unit 101 executes processing based on input instructions from the input unit 103 and issues output instructions to the output unit 104 .

The storage unit 102 stores a control program and the like for the binocular measuring device 1A. The input unit 103 includes an operation unit for receiving instructions from the user to the binocular measuring device 1A, a communication unit for transmitting and receiving information to and from external equipment, and sensors such as a light receiving element 726.

The output unit 104 includes a communication unit that transmits information to an external device and an external display device. The output unit 104 may include either an external display device or an indicator. Note that the communication section may be configured as a transmitting/receiving section, using both the input section 103 and the output section 104.

The light receiving output of the light receiving element 726 described above is input to the input section 103. The control unit 101 can output information about the light reception output signal acquired via the input unit 103 to the storage unit 102 and the output unit 104. The storage unit 102 stores the light reception output. Further, the output unit 104 may function as a display unit and display the result of the light reception output.

Further, the control unit 101 can output a control drive signal to the drive unit (output unit 104) to rotationally drive the variable cross cylinder 723 or rotationally drive the rotating prism 712.

As described above, the binocular measurement device 1A of the first embodiment is configured with a shape that imitates binoculars. In addition, the subjective refraction test unit 6A and the objective refraction test unit 7 are arranged in different directions relative to the line of sight direction D1. Therefore, it is possible to configure a small binocular measurement device 1A that has multiple test units and is easy to operate and handle by the subject.

(Embodiment 2)
Next, a description will be given of embodiment 2. Fig. 6 is a diagram showing the configuration of an optical system of a binocular measurement device 1B (1) in embodiment 2. In the description of the binocular measurement device 1B, the same components as those in the binocular measurement device 1A in embodiment 1 are denoted by the same reference numerals, and the description thereof will be omitted or simplified.

The binocular measurement device 1B includes a subjective refraction test section 6B (6) arranged in an optical path in the line of sight D1 of the subject's eye E, and an objective refraction test section 7 arranged in an optical path split from the optical path in the line of sight D1 to a direction D2 different from the line of sight D1. The subjective refraction test section 6B has a visual target 611, a VCC lens 65 (variable cross cylinder lens), a half mirror 63, and an objective lens 66 (a left objective lens 66L and a right objective lens 66R). The connecting section 4 accommodates a part of the configuration of the subjective refraction test section 6B on the opposite side to the eye E. In this embodiment, the connecting section 4 accommodates the visual target 611 (image display device 61). The connecting section 4 may be configured to accommodate the visual target 611 and the VCC lens 65.

In this embodiment, multiple optotypes 611 are arranged corresponding to the left and right test eyes E and the telescope tubes 2 and 3. Each optotype 611 is configured to be independently movable back and forth along the optical axis (in other words, along the line of sight D1). The control unit 101 adjusts the focus of the left and right test eyes E and the optotype 611 individually by moving the optotype 611 back and forth along the optical axis.

The VCC lens 65 includes a cylindrical lens 65A having a convex surface (positive power or positive power) and a cylindrical lens 65B having a concave surface (negative power or negative power). Ru. In the present embodiment, the cylindrical lens 65A is a single-convex lens having a convexly curved shape on the optotype 611 side, and the cylindrical lens 65B is a single-concave lens having a concavely curved shape on the eye E side. The cylindrical lenses 65A and 65B are driven by a drive device such as a pulse motor, and are driven by the control unit 101 to rotate independently around the optical axis. When the cylindrical lenses 65A and 65B are rotated in opposite directions, the astigmatic power is changed, and when they are rotated together in the same direction, the astigmatic axis angle is changed.

The half mirror 63, together with the objective lens 66, is housed in the left and right lens barrels 2 and 3, respectively.
The half mirror 63 transmits the light guided by the VCC lens 65 and guides it to the objective lens 66. The half mirror also has a function of reflecting the test light emitted from the objective refraction test unit 7 to the subject's eye E and reflecting the reflected light reflected by the subject's eye E to the objective refraction test unit 7.

The objective lens 66 collects the light emitted from the half mirror 63 and guides it to the subject's eye E via the eyepieces 21 and 31. The objective lens 66 also collects the light reflected by the subject's eye E and incident via the eyepieces 21 and 31 and guides it to the half mirror 63.

According to the binocular measurement device 1B of the second embodiment, the focus adjustment between the test eye E and the visual target 611 is adjusted according to the position of the visual target 611, so the number of lenses can be reduced compared to when a phoropter optical system is provided. Therefore, for example, the binocular measurement device 1B can simplify the configuration of the optical systems of the left lens barrel 2 and right lens barrel 3 compared to the binocular measurement device 1A, and can be made smaller overall.

The above describes a binocular measurement device 1 that includes a subjective refraction test section 6 arranged in an optical path in the line of sight of the subject's eye, an objective refraction test section 7 arranged in an optical path split from the optical path in the line of sight D1 to a direction D2 different from the line of sight, a left lens barrel 2 and a right lens barrel 3 that respectively accommodate a part of the subjective refraction test section 6 on the side of the subject's eye E and the objective refraction test section 7, a connecting section 4 that is connected to the left lens barrel 2 and the right lens barrel 3 on the side opposite the side of the subject's eye E and accommodates a part of the subjective refraction test section 6 on the side opposite the side of the subject's eye E, and an adjustment section 5 that has a function of adjusting the distance between the left lens barrel 2 and the right lens barrel 3 by a link mechanism. The binocular measurement device 1 is configured like a pair of handheld binoculars because the optical system is accommodated in a housing with fewer left lens barrel 2, right lens barrel 3, and connecting section 4. In addition, the objective refraction test section 7 can be configured to be small because a focusing lens can be omitted. Therefore, it is possible to provide a compact binocular measurement device 1 that has both subjective and objective refraction testing functions.

This concludes the description of the embodiments of the present disclosure, but aspects of the present disclosure are not limited to the configurations shown in each embodiment.

In this embodiment, an example in which a refraction measurement unit 700 is provided as the objective refraction testing unit 7 has been described, but a wavefront sensor may also be provided.

The configuration of the present disclosure is exemplified as follows.
[1]
a subjective refraction test section disposed in the optical path in the line of sight direction of the eye to be examined;
an objective refraction inspection unit disposed in an optical path that is separated from the optical path in the line-of-sight direction in a direction different from the line-of-sight direction;
A left lens barrel and a right lens barrel each housing a portion of the subjective refraction testing section on the eye to be examined side and the objective refraction testing section;
a connecting part that is connected to the left lens barrel and the right lens barrel on a side opposite to the eye to be examined, and accommodates a part of the subjective refraction test section on the side opposite to the eye to be examined;
an adjustment section having a function of adjusting the distance between the left lens barrel and the right lens barrel using a link mechanism;
A binocular measurement device equipped with.
[2]
The adjustment section rotatably connects a first link member fixed to the left lens barrel, a second link member fixed to the right lens barrel, and the first link member and the second link member. The binocular measurement device according to [1], further comprising a rotation shaft portion for rotating the binocular measurement device.
[3]
The subjective refraction testing unit includes an optotype, a condensing lens that guides the light emitted from the optotype and separates it into lights corresponding to the left and right eyes to be examined, and a condenser lens that guides the light emitted from the optotype and separates the light into two parts corresponding to the left and right eyes to be examined. It has a half mirror that transmits light, and a CV lens that refracts the light that has passed through the half mirror and guides it to the eye to be examined,
The connecting portion accommodates the optotype and the condensing lens, and is connected to one or both of the left lens barrel and the right lens barrel so as to be relatively movable,
The objective refraction testing unit, the half mirror, and the CV lens are housed in the left lens barrel or the right lens barrel,
The half mirror has a function of reflecting the test light emitted from the objective refraction testing unit to the eye to be examined, and reflecting the reflected light reflected by the eye to be examined to the objective refraction testing unit.
The binocular measuring device according to [1].
[4]
The condensing lens condenses light emitted from the optotype and incident on the half mirror of the left lens barrel, and light emitted from the optotype and incident on the half mirror of the right lens barrel. The binocular measurement device according to [2] or [3].
[5]
The binocular measuring device according to [3] or [4], wherein the left and right eyes to be examined and the optotype are focused by the CV lens.
[6]
The subjective refraction testing unit includes a plurality of optotypes arranged so as to be movable back and forth corresponding to the left and right eyes to be examined, a plurality of VCC lenses each guiding light emitted from the optotypes, and the It has a half mirror that transmits the light guided by the VCC lens, and an objective lens that condenses the light that has passed through the half mirror,
The connecting portion accommodates the optotype or the optotype and the VCC lens, and is connected to one or both of the left lens barrel and the right lens barrel so as to be relatively movable,
The objective refraction testing section, the half mirror, and the objective lens are housed in the left lens barrel and the right lens barrel,
The half mirror has a function of reflecting the test light emitted from the objective refraction testing unit to the eye to be examined, and reflecting the reflected light reflected by the eye to be examined to the objective refraction testing unit.
The binocular measuring device according to [1].
[7]
The binocular measurement device according to [6], wherein the left and right eyes to be examined and the optotype are focused by moving the optotype back and forth along the optical axis.

1 (1A, 1B) Binocular measurement device 2 Left lens barrel 3 Right lens barrel 4 Connection section 5 Adjustment section 6 (6A, 6B) Subjective refraction test section 7 Objective refraction test section 21 Eyepiece section 31 Eyepiece section 51 First link member 52 Second link member 53 Rotation shaft section 61 Image display device 62 Condenser lens 63 Half mirror 64 (64L, 64R) CV lens 65 VCC lens 65A, 65B Cylindrical lens 66 (66L, 66R) Objective lens 101 Control section 102 Memory section 103 Input section 104 Output section 611, 611' Optic target 700 Reflex measurement section 710 Measurement optical system 711 Objective lens 712 Rotating prism 713 Beam splitter 714 Relay lens 715 Iris diaphragm 716 Relay lens 717 Relay lens 718 Reflecting mirror 719 Relay lens 720 Measurement unit 721 Measurement light projection light source 722 Measurement light receiving optical system 723 Variable cross cylinder 724 Imaging lens 725 Hartmann plate 726 Light receiving elements D1, D2 Direction E Test eye P Axis W Distance

Claims (7)

a subjective refraction test section disposed in the optical path in the line of sight direction of the eye to be examined;
an objective refraction inspection unit disposed in an optical path that is separated from the optical path in the line-of-sight direction in a direction different from the line-of-sight direction;
A left lens barrel and a right lens barrel that respectively accommodate a portion of the subjective refraction testing section on the eye to be examined side and the objective refraction testing section;
a connecting part that is connected to the left lens barrel and the right lens barrel on a side opposite to the eye to be examined, and accommodates a part of the subjective refraction test section on the side opposite to the eye to be examined;
an adjustment section having a function of adjusting the distance between the left lens barrel and the right lens barrel using a link mechanism;
A binocular measurement device equipped with. The binocular measurement device according to claim 1, wherein the adjustment unit includes a first link member fixed to the left lens barrel, a second link member fixed to the right lens barrel, and a pivot shaft portion that rotatably connects the first link member and the second link member. the subjective refraction testing unit includes a visual target, a condensing lens that guides light emitted from the visual target and disperses the light corresponding to the left and right eyes to be examined, a half mirror that transmits the light condensed by the condensing lens, and a CV lens that refracts the light transmitted through the half mirror and guides it to the eyes to be examined,
The connecting portion accommodates the visual target and the condensing lens, and is connected to one or both of the left lens barrel and the right lens barrel so as to be relatively movable;
The objective refraction testing unit, the half mirror, and the CV lens are accommodated in the left lens barrel or the right lens barrel,
The half mirror has a function of reflecting the test light emitted from the objective refraction testing unit to the test eye and reflecting the reflected light reflected by the test eye to the objective refraction testing unit.
2. The binocular measurement device according to claim 1. The condensing lens condenses light emitted from the optotype and incident on the half mirror of the left lens barrel, and light emitted from the optotype and incident on the half mirror of the right lens barrel. The binocular measurement device according to claim 3. The binocular measuring device according to claim 3 or 4, wherein the left and right eyes to be examined and the optotype are focused by the CV lens. The subjective refraction testing unit includes a plurality of targets arranged so as to be movable back and forth corresponding to the left and right eyes to be examined, a plurality of VCC lenses each guiding light emitted from the targets, a half mirror that transmits the light guided by the VCC lens, and an objective lens that condenses the light transmitted through the half mirror,
The connecting portion accommodates the visual target, or the visual target and the VCC lens, and is connected to one or both of the left lens barrel and the right lens barrel so as to be relatively movable;
The objective refraction inspection unit, the half mirror, and the objective lens are accommodated in the left lens barrel and the right lens barrel,
The half mirror has a function of reflecting the test light emitted from the objective refraction testing unit to the test eye and reflecting the reflected light reflected by the test eye to the objective refraction testing unit.
2. The binocular measurement device according to claim 1. The binocular measurement device according to claim 6, wherein the left and right eyes to be examined and the optotype are focused by moving the optotype back and forth along the optical axis.

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