JPH1085181A - Subjective optometric apparatus for near sight - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optometric apparatus for near sight which allows simple and easy measurement by controlling the position of a visual acuity chart by the contents of this visual acuity chart and a method of measurement. SOLUTION: This optometric apparatus has an instrument to subjectively measure right and left eye characteristics, a near sight rod 200 extending in parallel with a visual axis in front of this instrument, a convergence means for converging the visual axis of the instrument for the purpose of near sight measurement and a near sight visual acuity chart device 300 which moves on this near sight rod 200 in the visual axis direction. A control section controls the convergence means so as to automatically converge the right and left visual axes to the visual acuity chart position. In such a case, this control section moves the near sight visual acuity chart device 300 to the prescribed position on the near sight rod 200 according to the contents of the selected visual acuity chart of the near sight visual acuity chart device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a near vision optometry apparatus for controlling a visual acuity table to be moved to a predetermined position in a near vision examination in a subjective eye characteristic examination.

[0002]

2. Description of the Related Art An examination performed by an ophthalmologist or an optician to determine a spectacle lens or an examination for performing comprehensive visual function measurement is called an optometry, and is an objective measurement that measures a broad range of data. There is a subjective optometry performed by arranging lenses of various powers in front of the subject in order to obtain a precise visual acuity value based on objectively measured data. In optometry, the eye's refractive power is mainly examined. In the refractive power test, a standard visual acuity table is usually installed at a distance of 5 m, and the distance visual acuity is measured.
A short-range visual acuity table may be installed at a location to measure near vision. The near vision measurement is originally performed as a test of accommodation power or presbyopia, but when both the far vision measurement and the near vision measurement are measured, new information that cannot be obtained by only the far vision measurement can be obtained. That is, if the near-sighted visual acuity is good even if the far-sighted visual acuity is reduced, myopia is expected,
Conversely, if near-sighted eyesight is lower than far-sighted eyesight,
Strong hyperopia, dysregulation, presbyopia, etc. are naturally expected.

The subjective refraction test includes a method using a refraction test table such as a visual acuity table and an astigmatism test table, and the most commonly used method is a lens replacement method. This is because a variety of optometry lenses are attached to the eyeglass test rod, etc.
In this method, the refractive power of the eye is obtained from the power of the corrective lens that provides the highest visual acuity, using a standard visual acuity table placed at a distance of 2 mm and a visual distance of 5 m. The turret-type subjective ophthalmoscope is a device that eliminates the need to replace various optometry lenses with eyeglass test rods. This is commonly called, for example, a vision tester,
Similar equipment has been released by domestic and foreign companies. This device is composed of two independent parts, a left-eye lens unit and a right-eye lens unit, and each part incorporates a spherical lens, a cylindrical lens, a rotating prism, a cross cylinder, an auxiliary lens, and the like. The spherical lens and the cylindrical lens are attached to a built-in lens turret, and the rotation thereof allows lenses of various powers to be arranged in front of the subject's eyes.

When examining an eye with a turret-type subjective ophthalmoscope,
Prior to performing far vision measurement and near vision measurement, the examiner first sits the subject in front of the optometer, and the spherical lens attached to the lens turret is positioned about 12 mm in front of the subject's eye. The relative position of the subject with respect to the optometer is determined so as to come. The distance vision measurement is 5 m in front of the subject's eye.
The standard visual acuity table is set at a distance of, and the visual acuity table is viewed by the subject through a subjective ophthalmoscope, and an identifiable target is answered. Similarly, in order to measure at a short distance of, for example, 30 cm, a short-range visual acuity chart composed of a visual acuity chart made for 30 cm and suspended on a member called a near rod is arranged at a distance of 30 cm in front of the eye to be examined. This is done by having the subject view the visual acuity table through an optometer and answering an identifiable target.

In the near vision measurement, as a near vision test, accommodation power, obliqueness, etc. are examined together with near vision.
In addition to the case of installing at the position of cm, there are also cases where inspection is performed by moving along the near point bar or changing the position. In the near-inspection, there are two types of measuring the accommodation power: the push-up method and the minus lens method. In the push-up method, a visual acuity table is brought close to a limit point where the eye can be clearly seen, and a position at which the contour is blurred is determined to measure a near point distance. In the minus lens method, a visual acuity table is presented at a position of 40 cm,
The minus lens is added in front of the subject until the subject is blurred. In either method, it is necessary to move the presentation position of the visual acuity table or switch the visual acuity table or the lens power. Further, when measuring accommodation power, a near vision chart is obtained from a distance and approached from a distance,
In some cases, the spherical power is fixed from a fixed position and the spherical power is changed from the negative side to the positive side. In the former case, however, the position to which the eyesight table is moved is not constant. Also,
In addition power measurement, it is conceivable to measure at a predetermined position. Thereafter, when measuring the visual acuity value at a required distance of the subject, it is necessary to move the subject again to that position.

As described above, among the subjective examinations, in the near vision examination, it is necessary to move the visual acuity table or bring it to a predetermined position depending on the contents and the measuring method of the visual acuity chart. . Conventionally, as such a near vision examination apparatus, in a subjective optometry apparatus shown in FIG. 9, a near vision chart 1 for near vision examination is removed from the visual axis at the time of distance vision measurement. It has a structure that rotates Table 1 and removes the near point bar 2 together. Also, at the time of near vision inspection, the near vision chart 1 for near vision inspection is inserted on the visual axis,
It was manually moved on the near bar 2 or brought to a predetermined position. In recent years, there have been some motors that are moved on a near rod by electric power. However, the position of the eye chart has not been controlled in accordance with the contents of the eye chart or the method of measurement.

[0007]

Among the subjective examinations, in the near vision examination, depending on the contents of the eye chart and the measuring method,
It is necessary to move the position of the eye chart or bring it to a predetermined position. However, in the conventional apparatus, there is no device that controls the position of the visual acuity table in accordance with the content of the visual acuity table and the method of measurement. Therefore, it is necessary to move or bring it to a predetermined position, which is troublesome and troublesome. For this reason, depending on the examiner, an error may occur in a method of using the visual acuity table or an inspection method, and an accurate inspection may not be performed. It is an object of the present invention to provide a near-inspection apparatus that eliminates the above-mentioned disadvantages of the conventional technology, controls the position of a visual acuity table by the contents of a visual acuity table and a method of measurement, and is simple and easy to measure. And

[0008]

In order to achieve the above object, according to the present invention, there is provided an instrument for subjectively measuring left and right eye characteristics, a control unit, and a device extending in front of the instrument parallel to the visual axis. A near vision rod, a convergence means for converging the visual axis of the instrument for near vision measurement, and a near vision chart apparatus for selecting a visual acuity table electrically and moving on the near vision rod in the visual axis direction And a subjective inspection device that controls the convergence means so that the control unit automatically converges the left and right visual axes to the visual acuity table position. Provided is a near-vision subjective optometry apparatus characterized in that the near-vision chart apparatus is moved to a predetermined position on the near rod according to the content of the selected chart. Further, in the present invention, an instrument for subjectively measuring left and right eye characteristics, a control unit, a near rod extending in front of the instrument parallel to the visual axis, and the instrument for near measurement. A convergence means for convergence of the visual axis, and a visual acuity table device for selecting a visual acuity table electrically and moving on the near bar in the visual axis direction, and the control unit controls the left and right visual axes. In a subjective optometry apparatus that controls the convergence means so as to automatically converge to a visual acuity table position, the visual optometer has operating means for selecting a visual acuity table of the near vision chart apparatus, and when the visual acuity table is selected by the operating means, And a control unit for moving the near vision chart device to a predetermined position on the near bar.

Further, one of the embodiments of the present invention is to correct the convergence angle based on the distance between pupils when the control unit controls the convergence means so that the left and right visual axes automatically converge to the visual acuity table position. It is also characterized by control.

[0010]

When the visual acuity chart of the near vision acuity chart device is selected, the control unit moves the near vision acuity chart apparatus to a predetermined position on the near bar according to the contents of the visual acuity chart. When the operation unit selects the visual acuity chart of the near vision acuity chart device, the control unit moves the near vision acuity chart device to a predetermined position on the near bar. In addition, when the control unit controls the convergence means so that the left and right visual axes automatically converge to the visual acuity table position, the control unit also controls the correction of the convergence angle based on the interpupillary distance.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG.
A pair of left and right eye optometry units 130, 130 ';
An eye examination part hanging housing 180 that suspends the left eye eye examination part 130 and the right eye eye examination part 130 ′, and a visual axis along the median line of the subject forward from the eye examination part hanging housing 180. Rod 200 extending parallel to the eye, and a near vision chart device 30 movably supported by the near rod 200 along the midline.
0, a congestion means shown in FIG. 5 or 7 described later, a control device 400 described later, and an operation unit 50 shown in FIG.
0 and an interpupillary distance measuring device PD (not shown). As shown in FIG. 2, the near vision chart device 300 includes a vision chart housing 310 and a shaft 3 attached to the vision chart housing 310.
20, a driven wheel 340 engaged with the periphery of the visual acuity disk 330, and a shaft 35
It comprises a visual acuity table disk rotating motor 360 for rotating the driven wheel 340 through a zero, and a visual acuity table disk rotation position detection switch 370.

In another embodiment of the near vision chart device 300, as shown in FIG. 3, the vision chart housing 312 is provided with a liquid crystal display device 332 for displaying a vision chart on one surface, and the liquid crystal display device 332 is provided. Liquid crystal display driver 362 for selectively displaying a visual acuity table on the liquid crystal display device 3
A visual acuity table selection display feedback circuit 372 that feeds back which visual acuity table is selected and displayed on the display 32.
Consists of As shown in FIG. 4, the operation unit 500 has, on its upper surface, a ten-key 501 for the examiner to input a value of the distance between pupils, a value of a position on the near rod 200 of the near vision chart device 300, and the like. A near vision table moving dial 502 for moving the near vision table 300 on the near rod 200,
The values input by the visual acuity table selection switch 503, the interpupillary distance correction switch 504, and the ten keys 501 for selecting the visual acuity table on the near visual acuity table device, the values of the interpupillary distance, and A display device 505 for indicating the position on the near bar 200 and the selected visual acuity table is provided. The operation unit 500 is provided independently as shown in FIG. 4, and is connected to another control panel of the subjective optometric device, or connected to a control panel of the subjective optometric device, online or wirelessly or offline such as optical communication. It may be integrated or provided as a part thereof.

As shown in FIG. 5, the convergence means by the prism has motors M ₁ and M ₂ connected to prisms PRI ₁ and PRI ₂ , respectively. Motors M ₁ and M ₂
The wires are connected so that the rotation direction is reversed. Prism P
By rotating the RI ₁ and the PRI _{2 in} directions opposite to each other, the direction of the line of sight passing through the rotating prism PRI ₁ and the rotating prism PRI ₂ can be deflected from 0Δ to a predetermined Δ. Similarly, each of the prism PRO ₁ and the prism PRO ₂ have the motor M ₃ and M ₄ are connected, and a motor M ₃ and M ₄ is being connected as the direction of rotation is reversed. Prism PRO ₁ and Prism PR
By rotating O ₂ in opposite directions, the direction of the line of sight passing through the rotating prism PRO ₁ and the rotating prism PRO ₂ can be deflected from 0Δ to a predetermined Δ. The convergence means by these rotating prisms is incorporated in a pair of left-eye and right-eye optometry units 130 and 130 'which are subjective optometry units of the near vision inspection apparatus.

The near rod 200 has pulleys P _{1 at} both ends.
And P ₂ are mounted on the shaft, and the pulleys P ₁ and P ₂
Has a belt V mounted thereon. The near vision table 300 is attached to the belt V. Note that the above-mentioned pulley P ₁ and the motor M ₅ is connected, the motor M
With the rotation of ₅ , the near vision chart device 300
Along the center line. The motors M ₁ , M ₂ , M ₃ , M ₄ , and M ₅ are connected to the controller 400
The control device 400 is connected to the operation unit 500. The control device 400 includes a pupil distance measuring device PD (not shown), a visual acuity disk rotating motor 360 and a visual acuity disk rotating position detection switch 370 of the near visual acuity table 300 shown in FIG. Is also connected. In the control device 400, instead of the visual acuity table disk rotation motor 360 and the visual acuity table disk rotation position detection switch 370 of the near vision table 300 shown in FIG.
As shown in parentheses in FIG. 5, the liquid crystal display device driver 362 shown in FIG. 3 and the visual acuity table selection display feedback circuit 372 may be connected.

As shown in FIG. 6, the system configuration when the convergence means by the prism is used is as follows:
The vision table disk rotation motor 360 and the vision table disk rotation position detection switch 370 of the near vision table device 300 shown in FIG. 2 described above, and the motors M ₁ and M ₂ shown in FIG.
M ₃ , M ₄ , and M ₅ , an interpupillary distance measuring device PD (not shown), and an operation unit 500 shown in FIG. 4 are connected. The control device 400 is shown in parentheses in FIG. 6 instead of the visual acuity table disk rotation motor 360 and the visual acuity table disk rotation position detection switch 370 of the near vision table device 300 shown in FIG. As described above, the liquid crystal display device driver 362 and the visual acuity table selection display feedback circuit 372 shown in FIG. Here, a near inspection method using a convergence means by a prism will be described.

(1) Method of measuring accommodation power using crosshair (lattice chart) First, the examiner uses the visual acuity table selection switch of the operation unit 500 shown in FIG. select. Then, a signal is transmitted from the operation unit 500 to the control device 400, and the control device 400 moves the visual acuity table rotating motor 360 of the near vision acuity table device 300 shown in FIG. 2 to rotate the visual acuity table. Based on a signal from the eyesight table rotation position detection switch 370, the eyesight table rotation motor 360 is stopped when the eyesight table is at the crosshair (lattice chart), and the crosshair (lattice chart) is selected and displayed. . When using the near vision chart device 300 as shown in FIG. 3, the control device 400 causes the liquid crystal display device driver 362 to display a chart on the liquid crystal display device 332, and outputs a signal from the vision chart selection display feedback circuit 372. When the visual acuity table displays the cross hair (lattice chart), the liquid crystal display device driver 362 is stopped.

[0017] Simultaneously, the control device 400, on the basis of a signal to the controller 400 from the operation unit 500 according to the visual acuity chart selection examiner, controls the motor M ₅ shown in FIG. 5, the near the near vision chart displaying apparatus 300 Move along the bar 200 in the midline direction to a distance of 60 cm to 70 cm and stop.
Control of the motor M ₅ for moving the near vision chart displaying apparatus 300 may be based on a signal from the optotype disk rotational position detecting switch 370, or based on a signal from the optotype selecting display feedback circuit 372 Is also good. When the interpupillary distance correction switch 504 of the operation unit 500 is set to auto, the interpupillary distance measuring device (not shown) built in the left eye optometry unit 130 and the right eye optometry unit 130 'of FIG. The PD irradiates light from a light source (not shown) to the eye to be inspected, detects light reflected on the cornea with a light receiving element (not shown) or a small CCD camera, obtains a distance between centers of curvature of the cornea of the eye to be inspected, The interpupillary distance of the examiner is measured. The interpupillary distance correction switch 504 may be set to manual, and the interpupillary distance separately measured in advance may be input using the numeric keypad 501. The pupil distance of the subject is stored in the control unit 400 in both cases. Simultaneously with the movement or stopping of the near vision chart displaying apparatus 300, the control unit 400 based on the control signal of the motor M ₅ shown in FIG. 5, or, based on a feedback signal from the motor M _5, near vision Table 300 An angle for rotating the rotating prism is calculated from the movement amount or position of the rotation prism. At the time of the calculation, the distance between the pupils of the subject stored in the control unit 400 is also used as a parameter of the calculation, and the angle for rotating the rotating prism is also corrected.

According to the calculation result, the motor M shown in FIG.
Rotating prisms PRI ₁ and PR by turning ₁ and M ₂
By rotating I ₂ and rotating the motors M ₃ and M ₄ , the rotating prism PRO ₁ and the rotating prism PRO ₂
To rotate. As a result, the subject's eye is a pair of left-eye and right-eye optometry units 13 which are subjective optometry units of the near-inspection apparatus.
In the lens frames 0 and 130 ', the near vision chart on the near vision chart device 300 on the near rod 200 can be seen by the line of sight extending parallel to the optical axis. Correction of the interpupillary distance of the subject is also performed. The convergence due to such an operation is constantly performed while the near vision table 300 is moving and is stopped. Thereafter, the examiner turns the near vision chart device moving dial 502 of the operation unit 500 in FIG. 4 to move the near vision chart device to a near point. Turning the near vision chart displaying apparatus moving dial 502, a signal proportional to the amount of rotation is transmitted to the controller 400, based on the control device 400 to the signal, rotates the motor M ₅ shown in FIG. 5, optotypes for near Move the device to near point.

(2) Method of Measuring Addition Using Crosshair (Lattice Chart) First, the examiner uses a visual acuity table selection switch of the operation unit 500 shown in FIG. Select Then, the control unit 40 is
0, a signal is transmitted to the control device 400, and the visual acuity table rotating motor 360 of the near vision acuity table device 300 shown in FIG.
To rotate the eyesight table, and based on the signal from the eyesight table disk rotation position detection switch 370, stop the eyesight table rotation motor 360 when the eyesight table is at the crosshair (lattice chart), and Grid chart)
Select and display. A near vision chart device 30 as shown in FIG.
When 0 is used, the control device 400 causes the liquid crystal display device driver 362 to display a visual acuity table on the liquid crystal display device 332. Based on a signal from the visual acuity table selection display feedback circuit 372, the visual acuity table is cross-haired (lattice chart).
Is displayed, the liquid crystal display device driver 362 is stopped.

[0020] Simultaneously, the control device 400, on the basis of a signal to the controller 400 from the operation unit 500 according to the visual acuity chart selection examiner, controls the motor M ₅ shown in FIG. 5, the near the near vision chart displaying apparatus 300 It is moved along the bar 200 in the direction of the midline, moved to a predetermined position, for example, 40 cm, and stopped. Control of the motor M ₅ for moving the near vision chart displaying apparatus 300, optotypes disc rotational position detecting switch 3
70 or may be based on a signal from the visual acuity table selection display feedback circuit 372. Interpupillary distance correction switch 504 of operation unit 500
Is set to auto, the left eye optometry unit 130 of FIG.
And a not-shown interpupillary distance measuring device PD built in the right-eye optometry unit 130 'irradiates light to a subject's eye from a light source (not shown). A light-receiving element (not shown) or a small C
The distance between the centers of curvature of the cornea of the eye to be examined is detected by a CD camera, and the distance between pupils of the subject is measured. The interpupillary distance correction switch 504 may be set to manual, and the interpupillary distance separately measured in advance may be input using the numeric keypad 501. In both cases, the interpupillary distance of the subject
Is stored.

At the same time as the movement or stop of the near vision table 300, the control unit 400 controls the motor M ₅ shown in FIG.
Based on the control signal, or based on a feedback signal from the motor M _5, it calculates the angle to rotate the rotating prism from the moving amount or position of the near vision chart displaying apparatus 300. At the time of the calculation, the distance between the pupils of the subject stored in the control unit 400 is also used as a parameter of the calculation, and the angle for rotating the rotating prism is also corrected. According to the calculation result, the rotating prisms PRI ₁ and PRI ₂ are rotated by rotating the motors M ₁ and M ₂ shown in FIG. 5, and the rotating prism PRO is rotated by rotating the motors M ₃ and M _4.
1 and the rotating prism PRO ₂ are rotated. As a result, in the lens frames of the pair of left-eye and right-eye optometry units 130 and 130 ′, which are subjective optometry units of the near-inspection apparatus, the eye to be examined is provided with a near-sight line extending parallel to the optical axis. The near vision chart on the near vision chart device 300 on the stick 200 can be seen. Correction of the interpupillary distance of the subject is also performed. The convergence due to such an operation is constantly performed while the near vision table 300 is moving and stopped.

Thereafter, the examiner measures the addition power. (3) Method of measuring visual acuity using visual acuity chart First, the examiner selects a visual acuity chart using a visual acuity table selection switch of the operation unit 500 shown in FIG. Then, the operation unit 5
00 to the control device 400, the control device 40
0 moves the eyesight table rotating motor 360 of the near vision table apparatus 300 shown in FIG. 2 to rotate the eyesight table.
On the basis of a signal from the eyesight table disk rotation position detection switch 370, the eyesight table stops the motor 360 for rotating the eyesight table disk at the eyesight chart, and selects and displays the eyesight chart. When using the near vision chart device 300 as shown in FIG. 3, the control device 400 controls the liquid crystal display device driver 36.
In step 2, the liquid crystal display device 332 displays a visual acuity table, and stops the liquid crystal display device driver 362 when the visual acuity table displays a visual acuity chart based on a signal from the visual acuity table selection display feedback circuit 372.

When the visual acuity chart is selected by the visual acuity table selection switch of the operation unit 500 shown in FIG.
The numeric keypad of 00 is automatically set to the distance input state. Next, when the examiner inputs a necessary distance with the ten keys 501 of the operation unit 500, a signal is transmitted to the control unit 400,
The controller 400 controls the motor M ₅ shown in FIG. 5,
The near vision table 300 is moved in the midline direction along the near bar 200, and is moved to the required distance and stopped. When the interpupillary distance correction switch 504 of the operation unit 500 is set to auto, the interpupillary distance measuring device (not shown) built in the left eye optometry unit 130 and the right eye optometry unit 130 'of FIG. The PD irradiates light from a light source (not shown) to the subject's eye. The light reflected on the cornea is detected by a light receiving element (not shown) or a small CCD camera, the distance between the centers of curvature of the cornea of the subject's eye is determined, and the distance between the pupils of the subject is measured. The pupil distance correction switch 504 may be set to manual, and the pupil distance separately measured in advance may be input using the numeric keypad 501. The pupil distance of the subject is controlled by the control unit 4 in both cases.
00 is stored.

At the same time that the near vision table 300 is moved or stopped, the control unit 400 controls the motor M ₅ shown in FIG.
Based on the control signal, or based on a feedback signal from the motor M _5, it calculates the angle to rotate the rotating prism from the moving amount or position of the near vision chart displaying apparatus 300. At the time of the calculation, the distance between the pupils of the subject stored in the control unit 400 is also used as a parameter of the calculation, and the angle for rotating the rotating prism is also corrected. According to the calculation result, the rotating prisms PRI ₁ and PRI ₂ are rotated by rotating the motors M ₁ and M ₂ shown in FIG. 5, and the rotating prism PRO is rotated by rotating the motors M ₃ and M _4.
1 and the rotating prism PRO ₂ are rotated. As a result, the eye to be examined is placed near by the line of sight extending parallel to the optical axis within the lens frames of the pair of left-eye and right-eye optometry units 130 and 130 ′, which are subjective optometry units of the near inspection apparatus. The near vision chart on the near vision chart device 300 on the stick 200 can be seen. Correction of the interpupillary distance of the subject is also performed. The convergence due to such an operation is constantly performed while the near vision table 300 is moving and stopped.

Thereafter, the examiner performs visual acuity measurement. (4) Method of near vision inspection using oblique examination chart First, the examiner selects the oblique examination chart by using the visual acuity table selection switch of the operation unit 500 shown in FIG. Then, a signal is transmitted from the operation unit 500 to the control device 400, and the control device 400 moves the visual acuity table disk rotating motor 360 of the near vision acuity table device 300 shown in FIG. Based on the signal from the disk rotation position detection switch 370, the visual acuity table stops the motor 360 for rotating the visual acuity table at the position of the oblique examination chart, and the oblique examination chart is displayed. When the near vision chart device 300 as shown in FIG. 3 is used, the control device 400 causes the liquid crystal display device driver 362 to display a chart on the liquid crystal display device 332,
When the visual acuity table displays the oblique examination chart based on the signal from the visual acuity table selection display feedback circuit 372,
The liquid crystal display device driver 362 is stopped.

[0026] Simultaneously, the control device 400, on the basis of a signal to the controller 400 from the operation unit 500 according to the visual acuity chart selection examiner, controls the motor M ₅ shown in FIG. 5, the near the near vision chart displaying apparatus 300 It is moved along the bar 200 in the midline direction, moved to a predetermined position, for example, a distance of 40 cm, and stopped. Control of the motor M ₅ for moving the near vision chart displaying apparatus 300 may be based on a signal from the optotype disk rotational position detecting switch 370, or based on a signal from the optotype selecting display feedback circuit 372 Is also good. When the interpupillary distance correction switch 504 of the operation unit 500 is set to auto, the interpupillary distance measuring device (not shown) built in the left eye optometry unit 130 and the right eye optometry unit 130 'of FIG. The PD irradiates light from a light source (not shown) to the eye to be inspected, detects the light with a light receiving element (not shown) reflected on the cornea or a small CCD camera, obtains the distance between the centers of curvature of the cornea of the eye to be inspected, and Is measured. The pupil distance correction switch 504 may be set to manual, and the pupil distance separately measured in advance may be input using the numeric keypad 501. In both cases, the interpupillary distance of the subject
Is stored.

At the same time as the movement or stop of the near vision table 300, the control unit 400 controls the motor M ₅ shown in FIG.
Based on the control signal, or based on a feedback signal from the motor M _5, it calculates the angle to rotate the rotating prism from the moving amount or position of the near vision chart displaying apparatus 300. At the time of the calculation, the distance between the pupils of the subject stored in the control unit 400 is used as a calculation parameter, and the angle for rotating the rotating prism is also corrected. According to the calculation result,
By rotating the motors M ₁ and M ₂ shown in FIG. 5, the rotating prisms PRI ₁ and PRI ₂ are rotated, and by rotating the motors M ₃ and M ₄ , the rotating prisms PRO ₁ and PRO ₂ are rotated. . As a result, the eye to be examined is placed near by the line of sight extending parallel to the optical axis within the lens frames of the pair of left-eye and right-eye optometry units 130 and 130 ′, which are subjective optometry units of the near inspection apparatus. The near vision chart on the near vision chart device 300 on the stick 200 can be seen. Correction of the interpupillary distance of the subject is also performed. The convergence due to such an operation is constantly performed while the near vision table 300 is moving and stopped.

Thereafter, the examiner performs an oblique examination. Optometrist
Means of congestion due to the frustration will be described with reference to FIG. E_L
Is the left eye, E_RIs the right eye, VT_LAnd V
T_RIs the lens frame for the left eye of the subjective optometry of the near-inspection device
And the right-eye lens frame, the left-eye optometry unit 130 of FIG.
It corresponds to the right eye optometry unit 130 '. Lens frame VT for left eye
_LHas a motor M for rotating the lens frame.₁,right
Ophthalmic lens frame VT_RTo rotate the lens frame
Motor M_TwoAre connected. In addition, to near rod 200
Is a pulley P at both ends₁And P _TwoIs attached to the shaft,
Car P₁And P_TwoHas a belt V mounted thereon. The ba
The near vision chart device 300 is attached to the
You. The pulley P ₁Has a motor M_ThreeAre linked
And the motor M_ThreeNear vision chart device 30 with the rotation of
0 is movable in the midline direction along the near rod 200
is there.

The motors M ₁ , M ₂ , and M ₃ are connected to a control device 400, which is connected to an operation unit 500. Further, the control device 400 includes a pupil distance measuring device PD (not shown) and the motor 3 for rotating the visual acuity table disk of the near visual acuity table device 300 shown in FIG.
60 and the eyesight chart disk rotational position detection switch 370 are also connected. The control device 400 includes a motor 360 for rotating the eyesight table disk of the near vision table device 300 shown in FIG.
Instead, as shown in parentheses in FIG.
May be connected to the liquid crystal display device driver 362 and the visual acuity table selection display feedback circuit 372 shown in FIG. The configuration of the system in the case where the convergence means due to the tilting of the optometry unit is used will be described with reference to FIG. The control device 400 includes a visual acuity table disk rotation motor 360 and a visual acuity table disk rotation position detection switch 370 of the near vision table device 300 shown in FIG. 2 described above, and the motors M ₁ and M ₂ shown in FIG. , And M ₃ , a pupil distance measuring device PD (not shown), and an operation unit 500 shown in FIG. The control device 400 is shown in parentheses in FIG. 8 instead of the visual acuity table disk rotation motor 360 and the visual acuity table disk rotation position detection switch 370 of the near vision table device 300 shown in FIG. As described above, the liquid crystal display driver 36 shown in FIG.
2, and the visual acuity table selection display feedback circuit 372 may be connected.

Here, a description will be given of a near-inspection method in the case where convergence means due to tilting of the optometry unit is used. (5) Method of Measuring Adjustment Using Crosshair (Lattice Chart) First, the examiner selects the crosshair (lattice chart) and the adjustment power with the eyesight table selection switch of the operation unit 500 shown in FIG. Then, a signal is transmitted from the operation unit 500 to the control device 400, and the control device 400 moves the visual acuity table disk rotating motor 360 of the near vision acuity table device 300 shown in FIG. Based on a signal from the disk rotation position detection switch 370, the visual acuity table rotation motor 360 is stopped when the visual acuity table is at a crosshair (lattice chart). When using the near vision chart device 300 as shown in FIG. 3, the control device 400 causes the liquid crystal display device driver 362 to display a chart on the liquid crystal display device 332, and the visual chart selection / display feedback circuit 37.
When the visual acuity table displays the crosshair (lattice chart) based on the signal from the second, the liquid crystal display driver 3
Stop 62.

[0031] Simultaneously, the control device 400, on the basis of a signal to the controller 400 from the operation unit 500 according to the visual acuity chart selection examiner, controls the motor M ₃ shown in FIG. 7, the near the near vision chart displaying apparatus 300 Move along the bar 200 in the midline direction to a distance of 60 cm to 70 cm and stop.
Control of the motor M ₃ for moving the near vision chart displaying apparatus 300 may be based on a signal from the optotype disk rotational position detecting switch 370, or based on a signal from the optotype selecting display feedback circuit 372 Is also good. When the interpupillary distance correction switch 504 of the operation unit 500 is set to auto, the interpupillary distance measuring device P (not shown) built in the left eye optometry unit 130 and the right eye optometry unit 130 'of FIG.
D irradiates light from a light source (not shown) to the eye to be examined, detects the light with a light receiving element (not shown) reflected on the cornea or a small CCD camera, obtains the distance between the centers of curvature of the cornea of the eye to be examined, and Is measured. Interpupillary distance correction switch 50
4 may be set to manual, and the interpupillary distance separately measured in advance may be input using the numeric keypad 501. The pupil distance of the subject is stored in the control unit 400 in both cases.

At the same time that the near vision table 300 is moved or stopped, the control unit 400 controls the motor M ₃ shown in FIG.
Based on the control signal, or, based on a feedback signal from the motor M _3, the left-eye showing the movement amount or the position of the near vision chart displaying apparatus 300 in FIG. 7 of the ophthalmic refractor means near the inspection apparatus of FIG. 1 the lens frame VT _L and the right-eye lens frame VT _R calculates the angle to rotate. At the time of the calculation, the distance between the pupils of the subject stored in the control unit 400 is used as a parameter of the calculation, and the angle for rotating the lens frame is also corrected. According to the calculation result, the motor M ₁ shown in FIG.
And a lens frame VT _L and the right-eye lens frame VT _R for the left eye is rotated by turning the M _2. Thus, the line of sight to see the optotypes of near vision table device 300 subject's eye becomes to coincide with the optical axis of the left eye lens frame VT _L and the right-eye lens frame VT _R. In addition, the correction of the interpupillary distance of the subject is also performed. The convergence due to such an operation is performed at any time while the near vision table 300 is moving and while it is stopped.

Thereafter, the examiner turns the near vision table moving dial 502 of the operation unit 500 in FIG. 4 to move the near vision table to the near point. Near vision chart moving dial 5
02, a signal proportional to the amount of rotation
Sent to the control device 400 based on the signal, rotates the motor M ₃ shown in FIG. 7, to move the near vision chart displaying apparatus to the near point. (6) Method of adding power measurement using crosshair (lattice chart) First, the examiner selects crosshair (lattice chart) and additional power measurement with the eyesight table selection switch of the operation unit 500 shown in FIG. . Then, the control unit 40 is
0, a signal is transmitted to the control device 400, and the visual acuity table rotating motor 360 of the near vision acuity table device 300 shown in FIG.
To rotate the visual acuity table, and based on a signal from the visual acuity disk rotation position detection switch 370, stops the visual acuity disk rotation motor 360 when the visual acuity table is at a crosshair (lattice chart). When using the near vision chart device 300 as shown in FIG. 3, the control device 400 causes the liquid crystal display device driver 362 to display a chart on the liquid crystal display device 332, and outputs a signal from the vision chart selection display feedback circuit 372. When the visual acuity table displays the cross hair (lattice chart) based on the visual acuity table, the liquid crystal display driver 36
Stop 2

[0034] Simultaneously, the control device 400, on the basis of a signal to the controller 400 from the operation unit 500 according to the visual acuity chart selection examiner, controls the motor M ₃ shown in FIG. 7, the near the near vision chart displaying apparatus 300 It is moved along the bar 200 in the direction of the midline, moved to a predetermined position, for example, 40 cm, and stopped. The control of the motor M ₃ for moving the near vision chart device 300 is performed by using the vision chart disc rotation position detection switch 3.
70 or may be based on a signal from the visual acuity table selection display feedback circuit 372. Interpupillary distance correction switch 504 of operation unit 500
Is set to auto, the pupil distance measuring device PD (not shown) built in the left eye optometry unit 130 and the right eye optometry unit 130 'in FIG. 1 receives light from a light source (not shown). For optometry,
The distance between the centers of curvature of the cornea of the eye to be examined is determined by detecting with a light receiving element (not shown) or a small CCD camera reflected on the cornea, and the distance between the pupils of the subject is measured. Set the pupil distance correction switch 504 to manual, and use the numeric keypad 501.
Thus, the interpupillary distance separately measured in advance may be input. The pupil distance of the subject is stored in the control unit 400 in both cases.

At the same time as the movement or stop of the near vision table 300, the control unit 400 controls the motor M ₃ shown in FIG.
Based on the control signal, or, based on a feedback signal from the motor M _3, the left-eye showing the movement amount or the position of the near vision chart displaying apparatus 300 in FIG. 7 of the ophthalmic refractor means near the inspection apparatus of FIG. 1 the lens frame VT _L and the right-eye lens frame VT _R calculates the angle to rotate. At the time of the calculation, the distance between the pupils of the subject stored in the control unit 400 is used as a parameter of the calculation, and the angle for rotating the lens frame is also corrected. According to the calculation result, the motor M ₁ shown in FIG.
And a lens frame VT _L and the right-eye lens frame VT _R for the left eye is rotated by turning the M _2. Thus, the line of sight to see the optotypes of near vision table device 300 subject's eye becomes to coincide with the optical axis for the left eye lens frame VT _L and the right-eye lens frame VT _R. In addition, the correction of the interpupillary distance of the subject is also performed. The convergence due to such an operation is constantly performed while the near vision table 300 is moving and while it is stopped. Thereafter, the examiner measures the addition power.

(7) Method of measuring visual acuity using visual acuity chart First, the examiner selects a visual acuity chart using the visual acuity table selection switch of the operation unit 500 shown in FIG. Then, the operation unit 5
00 to the control device 400, the control device 40
0 moves the eyesight table disk rotation motor 360 of the near vision table apparatus 300 shown in FIG. 2 to rotate the eyesight table, and based on a signal from the eyesight table rotation position detection switch 370, the eyesight table is displayed. The visual acuity chart rotating motor 360 is stopped at the visual acuity chart, and the visual acuity chart is displayed.
When using the near vision chart device 300 as shown in FIG. 3, the control device 400 causes the liquid crystal display device driver 362 to display a chart on the liquid crystal display device 332, and outputs a signal from the vision chart selection display feedback circuit 372. When the visual acuity chart displays the visual acuity chart based on the visual acuity chart, the liquid crystal display device driver 362 is stopped.

When a visual acuity chart is selected by the visual acuity table selection switch of the operation unit 500 shown in FIG.
The numeric keypad of 00 is automatically set to the distance input state. Next, when the examiner inputs a necessary distance with the ten keys 501 of the operation unit 500, a signal is transmitted to the control unit 400,
The controller 400 controls the motor M ₃ shown in FIG. 7,
The near vision table 300 is moved in the midline direction along the near bar 200, and is moved to the required distance and stopped. When the pupil distance correction switch 504 of the operation unit 500 is set to auto, the left eye optometry unit 1 of FIG.
30 and a pupil distance measuring device PD (not shown) built in the right eye optometry unit 130 'apply light from a light source (not shown) to the eye to be examined, and receive light reflected on the cornea (not shown) or a small light receiving element. , The distance between the centers of curvature of the cornea of the subject's eye is determined, and the distance between the pupils of the subject is measured. The interpupillary distance correction switch 504 may be set to manual, and the interpupillary distance separately measured in advance may be input using the numeric keypad 501. The pupil distance of the subject is controlled by the control unit 40 in both cases.
0 is stored.

At the same time as the movement or stop of the near vision table 300, the control unit 400 controls the motor M ₃ shown in FIG.
Based on the control signal, or, based on a feedback signal from the motor M _3, the left-eye showing the movement amount or the position of the near vision chart displaying apparatus 300 in FIG. 7 of the ophthalmic refractor means near the inspection apparatus of FIG. 1 the lens frame VT _L and the right-eye lens frame VT _R calculates the angle to rotate. At the time of the calculation, the distance between the pupils of the subject stored in the control unit 400 is used as a parameter of the calculation, and the angle for rotating the lens frame is also corrected. According to the calculation result, the motor M ₁ shown in FIG.
And a lens frame VT _L and the right-eye lens frame VT _R for the left eye is rotated by turning the M _2. Thus, the line of sight to see the optotypes of near vision table device 300 subject's eye becomes to coincide with the optical axis for the left eye lens frame VT _L and the right-eye lens frame VT _R. In addition, the correction of the interpupillary distance of the subject is also performed. The convergence due to such an operation is constantly performed while the near vision table 300 is moving and while it is stopped. Thereafter, the examiner performs visual acuity measurement.

(8) Method of near vision examination using oblique examination chart First, the examiner selects the oblique examination chart with the visual acuity table selection switch of the operation unit 500 shown in FIG. Then, a signal is transmitted from the operation unit 500 to the control device 400, and the control device 400 moves the visual acuity table disk rotating motor 360 of the near vision acuity table device 300 shown in FIG. Based on the signal from the disc rotation position detection switch 370, the visual acuity table stops the motor 360 for rotating the visual acuity table at the position of the oblique examination chart, and the oblique examination chart is displayed. When the near vision chart device 300 as shown in FIG. 3 is used, the control device 400 causes the liquid crystal display device driver 362 to display a chart on the liquid crystal display device 332,
When the visual acuity table displays the oblique examination chart based on the signal from the visual acuity table selection display feedback circuit 372,
The liquid crystal display device driver 362 is stopped.

[0040] Simultaneously, the control device 400, on the basis of a signal to the controller 400 from the operation unit 500 according to the visual acuity chart selection examiner, controls the motor M ₃ shown in FIG. 7, the near the near vision chart displaying apparatus 300 It is moved along the bar 200 in the midline direction, moved to a predetermined position, for example, a distance of 40 cm, and stopped. Control of the motor M ₃ for moving the near vision chart displaying apparatus 300 may be based on a signal from the optotype disk rotational position detecting switch 370, or based on a signal from the optotype selecting display feedback circuit 372 Is also good. If the interpupillary distance correction switch 504 of the operation unit 500 is set to auto, the interpupillary distance measuring device PD (not shown) built in the left eye optometry unit 130 and the right eye optometry unit 130 'of FIG. However, light from a light source (not shown) is applied to the eye to be examined, light reflected on the cornea is detected by a light receiving element (not shown) or a small CCD camera, and the distance between the centers of curvature of the cornea of the eye to be examined is determined. The distance between the pupils of an individual is measured. The interpupillary distance correction switch 504 may be set to manual, and the interpupillary distance separately measured in advance may be input using the numeric keypad 501. The pupil distance of the subject is controlled by the control unit 4 in both cases.
00 is stored.

At the same time that the near vision table 300 is moved or stopped, the control unit 400 controls the motor M ₃ shown in FIG.
Based on the control signal, or, based on a feedback signal from the motor M _3, the left-eye showing the movement amount or the position of the near vision chart displaying apparatus 300 in FIG. 7 of the ophthalmic refractor means near the inspection apparatus of FIG. 1 the lens frame VT _L and the right-eye lens frame VT _R calculates the angle to rotate. At the time of the calculation, the distance between the pupils of the subject stored in the control unit 400 is used as a parameter of the calculation, and the angle for rotating the lens frame is also corrected. According to the calculation result, the motor M ₁ shown in FIG.
And a lens frame VT _L and the right-eye lens frame VT _R for the left eye is rotated by turning the M _2. Thus, the line of sight to see the optotypes of near vision table device 300 subject's eye becomes to coincide with the optical axis for the left eye lens frame VT _L and the right-eye lens frame VT _R. In addition, the correction of the interpupillary distance of the subject is also performed. The convergence due to such an operation is performed at any time while the near vision table 300 is moving and while it is stopped. Thereafter, the examiner performs an oblique examination.

[0042]

Since the present invention is configured as described above, the near vision table apparatus is automatically selected according to the contents of the vision table only by selecting the vision table. Position, and the correction of convergence based on the distance between pupils is also performed automatically, so that the position of the near vision table differs depending on the visual acuity table and test method, and the convergence angle differs depending on the distance between the pupils, etc. Even an examiner who does not know itself can perform an accurate examination. In addition, even if a number of persons are examined in one day, the examiner does not need to stand up to move the eye chart while sitting, so that there is an advantage that fatigue is significantly reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view schematically showing a near vision optometry apparatus according to an embodiment of the present invention.

FIG. 2 is a perspective view of a near vision table.

FIG. 3 is a perspective view of another near vision chart device.

FIG. 4 is a perspective view showing details of an operation unit.

FIG. 5 is an explanatory diagram of a configuration of a convergence unit using a prism.

FIG. 6 is an explanatory diagram of a configuration of a system using convergence means by a prism.

FIG. 7 is an explanatory diagram of a configuration of a convergence unit by tilting an optometry unit.

FIG. 8 is an explanatory diagram of a configuration of a system using convergence means due to tilting of an optometry unit.

FIG. 9 is a perspective view of a conventional near vision optometer.

[Explanation of symbols]

 130 right eye optometry unit 130 ′ left eye optometry unit 200 near rod 300 near vision chart device 400 control device 500 operation unit

Claims (4)

[Claims] 1. An instrument for subjectively measuring left and right eye characteristics, a control unit, a near rod extending in front of the instrument parallel to a visual axis, and a vision of the instrument for near measurement. A convergence means for convergence of the axis, a near vision table apparatus for selecting a visual acuity table electrically and moving on the near bar in the visual axis direction, and the control unit automatically controls the left and right visual axes. In the subjective optometry apparatus for controlling the convergence means so as to converge to the visual acuity table position, the control unit controls the near visual acuity table apparatus according to the content of the selected visual acuity table of the near visual acuity table apparatus. Moving the eyepiece to a predetermined position on the near-object bar. 2. An instrument for subjectively measuring left and right eye characteristics, a control unit, a near rod extending in front of the instrument in parallel with a visual axis, and a visual inspection of the instrument for near measurement. A convergence means for convergence of the axis, a near vision table apparatus for selecting a visual acuity table electrically and moving on the near bar in the visual axis direction, and the control unit automatically controls the left and right visual axes. In a subjective optometric apparatus that controls the convergence means so as to converge to the eye chart position, comprising an operating means for selecting the eye chart of the near vision table apparatus,
When the visual acuity table is selected by the operating means, the control unit:
A near-vision subjective optometry apparatus, wherein the near-vision chart is moved to a predetermined position on the near bar. 3. The convergence angle correction control based on the interpupillary distance when the control unit controls the convergence means so that the left and right visual axes automatically converge to a visual acuity table position. Item 2. The near-use subjective optometry apparatus according to Item 1. 4. The convergence angle correction control based on the interpupillary distance when the control unit controls the convergence means so that the left and right visual axes automatically converge to a visual acuity table position. Item 3. The near-use subjective optometry apparatus according to Item 2.