JPH0626538B2 - Visual acuity test equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a visual acuity test apparatus for precisely testing an astigmatic axis and an astigmatic degree using a cross cylinder lens.

[0002]

2. Description of the Related Art Conventionally, as an optical device for visual acuity test,
A combination of a cross cylinder lens and a cylindrical lens for correcting astigmatism is known.

In order to inspect the astigmatism with such a visual acuity test apparatus, the combination of the cross cylinder lens and the cylindrical lens is changed while rotating the cross cylinder lens and the cylindrical lens according to the subject's awareness. There is something I did.

An example of this is, for example, US Pat.
An astigmatism inspecting apparatus has been proposed in which a driving mechanism for a cross cylinder lens and a cylindrical lens as disclosed in JP-A-8,699 and JP-A-59-44237 is used.

In the astigmatism inspecting apparatus disclosed in Japanese Patent Laid-Open No. 59-44237, a cross cylinder lens and a cylindrical lens are provided so that they can be rotationally driven by separate motors, respectively, and each of these motors is operated by a forward rotation switch and a reverse rotation. The switches enable the forward and reverse rotation operations separately.

When performing an astigmatism test using such a subjective optometry apparatus, a forward rotation operation and a reversal operation of the cross cylinder lens are performed, and the sharpness of the inspection target is compared before and after the reversal. Is being done.

This comparison is performed by the examiner asking the examiner whether or not either before or after the inversion was clearly visible, and the examinee's response to this question. Moreover, in this comparison, it is necessary to change the axial angle of the cylindrical lens or change the power of the cylindrical lens while rotating the cylindrical lens in the positive direction or the negative direction according to the subject's awareness as described above. There is also.

[0008]

However, in the visual acuity test such as the astigmatism test, the examiner uses the cross cylinder lens or the cylindrical lens according to the response of the examinee during the rotation operation (rotation adjustment) of the lens. It takes time because it is rotated separately by different switches.

Therefore, the present invention has been made in order to overcome the above-mentioned drawbacks of the prior art, and the refractive state of the lens is sequentially changed according to a preset procedure each time one switch is pressed, and the inspection is performed. The present invention provides a visual acuity test apparatus that enables an operator or an examiner to perform a visual acuity test easily and in a short time.

[0010]

In order to achieve this object, the present invention provides a first refraction inspection optical system in which the lens refraction state of the observation optical path is changed by being drive-controlled by a first lens driving device, and a second refraction inspection optical system. A second refraction inspection optical system that is driven and controlled by a lens driving device to change the lens refraction state of the observation optical path; and a control unit that receives an operation signal from one switch and controls the operation of both the driving devices. Each time the control means receives the operation signal from the switch, the control means controls each of the driving devices so that the visual acuity test device is set to change each of the refraction states according to a preset procedure. It is a feature.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described based on embodiments with reference to the accompanying drawings.

FIG. 1 is a block diagram of an embodiment. The far-sighted correction optical system includes a rotatable spherical lens plate 1 and a plurality of spherical lenses 2 arranged on the same radius of the spherical lens plate 1.

This spherical lens plate 1 has a shaft 4 which is driven by a perspective vision correction optical system drive motor (hereinafter referred to as "perspective drive motor") 3.
Is rotated centering on one side and one of the plurality of spherical lenses 2 is selectively arranged in the observation optical path through which the inspection target P is seen.

The astigmatism correction optical system (first refraction inspection optical system) is composed of a rotatable cylindrical lens plate 5 and a plurality of cylindrical lenses 6 arranged on the same radius of the cylindrical lens plate 5. This cylindrical lens plate 5 has an astigmatism correction optical system drive motor (hereinafter referred to as “astigmatism drive motor”) 8 centered on an axis 7.
And one of the plurality of cylindrical lenses 6 is selectively arranged in the observation optical path. In addition, the cylindrical lens 6 is an astigmatism correction optical system cylindrical axis rotation motor (hereinafter referred to as “astigmatic rotation motor”).
9) (first lens rotating device). The motors 8 and 9 form a first lens driving device.

A cross cylinder lens (hereinafter referred to as "CC lens") 10 (second refraction inspection optical system) is rotatably provided by a second lens rotating device (second lens driving device). This second lens rotation device is a cross cylinder lens axis rotation motor (hereinafter referred to as "CC axis rotation motor") 11
And a cross cylinder lens reversing motor (hereinafter referred to as “CC reversing motor”) 12.

The motors 3, 8, 9, 11, 12 shown above are
For example, the control unit 13 including a microprocessor or the like
Controlled by.

The control unit 13 (control means) has a memory 14 for storing programs and the like, a keyboard 15 for inputting operation information and the like, a CRT 16 for displaying control information inspection results and the like, an examinee. Is a subject response switch (hereinafter referred to as “response switch”) operated by comparing the sharpness of the inspection target P.
17) etc. are connected.

FIG. 2 is a control block diagram of the embodiment shown in FIG. The same elements as those in FIG. 1 are designated by the same reference numerals. The S (sphericity), C (cylindricity) and AX (cylindrical axis) data input by the examiner from the keyboard 15 are motors 3, 8, 9, 1
It is given to a motor rotation amount calculation circuit (hereinafter referred to as “calculation circuit”) 21 that calculates the rotation amounts of 1 and 12.

Further, the signal from the response switch 17 is given to the arithmetic circuit 21 via the discriminating circuit 22, and the arithmetic circuit 21 receives a C signal.
The memory 14 is connected via the PU 23.

The output of the arithmetic circuit 21 is transferred to C via the conversion circuit 24.
It is given to RT16, is output and displayed here, and is also given to the motor controllers 26 to 30 which control the respective motors 3, 8, 9, 11, 12 via the gate circuit 25.

A pulse from a pulse oscillator 31 is given to the motor controllers 26 to 30, and the respective motors 3, 8, 9, 11, 12 which are pulse motors are rotationally driven by this.

Next, the operation of the embodiment shown in FIGS. 1 and 2 will be described with reference to the flow chart of FIG.

In the following description of the operation, the refractive power of the eye to be inspected has been measured in advance by an objective optometer, which is used for performing precise measurement of astigmatism with the apparatus of the present invention, especially with the CC lens. It is a thing.

First, after the reset operation (step 100), S (sphericity) data is input from the keyboard 15 (stitch 101), and the arithmetic circuit 21 calculates the amount of rotation of the perspective drive motor 12 based on this (stitch 101) ( Step 102).

The calculation result is given to the motor controller 30 via the gate circuit 25, whereby the perspective drive motor is obtained.
12 is rotated by a predetermined amount and a spherical lens 2 having a predetermined spherical degree
Is set on the optical axis (step 103).

The spherical lens 2 set in this way
The sphericity S is displayed on the CRT 16 (step 104), and if the subject has a desired sphericity as a result of comparison of sharpness, the process proceeds to the next step (step 105).

Next, C (cylindricity) data is input from the keyboard 15 (step 111), and the arithmetic circuit 21 is based on this.
The amount of rotation of the astigmatic drive motor 8 is calculated by (step 11
2).

The result of this calculation is given to the motor controller 29 via the gate circuit 25, whereby the astigmatism drive motor 8 is rotated by a predetermined amount and the cylindrical lens 6 of a predetermined cylindrical degree is set on the optical axis ( Step 113).

The cylindrical lens 6 set in this way
The cylindricity C of CRT16 is displayed on the CRT 16 (step 114), and when the cylindricity is the desired cylindricity, the process proceeds to the next step (step 11).
Five).

Next, the AX data is input from the keyboard 15 (step 121), and the rotation amounts of the CC axis rotation motor 11 and the astigmatic rotation motor 9 are calculated by the calculation circuit 21 (steps 122, 123).
It Based on these calculation results, the CC axis rotation motor 11 and the astigmatic rotation motor 9 are rotated to set the cylinder axis of the cylindrical lens 6 at a desired angle, and the central axis of the CC lens 10 is the cylinder axis of the cylindrical lens 6. Is set to the same axis angle as
(Steps 124, 125).

Then, the set value of C data is displayed on the CRT 16 (step 126), and when the value reaches a desired value, the process proceeds to the next step (step 127).

Next, the CC lens 10 is set in the optical path (step 131), the CC reversing motor 12 is normally rotated, and the A surface (reference numeral A in FIG. 1) of the CC lens 10 is set to the front surface (step 13).
2).

Thereafter, the CC reversing motor 12 is rotated in the reverse direction so that the B surface (reference numeral B in FIG. 1) of the CC lens 10 is set to the front surface (step 133).
The A side of 10 is set to the front (block 134).

At this time, as a result of the comparison of sharpness, when the response switch 17 is turned on by the subject in the state where the sharpness is superior (step 135), the CC shaft reversing motor 11 is rotated in the normal direction to CC. The intermediate axis of the lens 10 is normally rotated by a predetermined angle α (step 136), and the astigmatic rotation motor 9 is normally rotated so that the axis of the cylindrical lens 6 is normally rotated by a predetermined angle α (step 137). . Thus, the astigmatism correction optical system which is the first refraction inspection optical system and the CC which is the second refraction inspection optical system
The refraction state of the lens 10 in the observation optical path is changed according to a preset procedure. When the processes of steps 136 and 137 are completed, the process returns to step 133.

When the response switch 17 is not turned on in step 135, the CC reversing motor 12 is reversed.
The B side of the CC lens 10 is set to the front side (step 14
1).

As a result of the comparison of sharpness, when the response switch 17 is turned on by the subject (step 1
42), the CC axis rotation motor 11 is reversely rotated to reverse the intermediate axis of the CC lens 10 by a desired angle α (step 143), and the astigmatic rotation motor 9 is reversely rotated to reverse the axis of the cylindrical lens 10 by α. (Step 144). After this, CC reversing motor 12
Is rotated in the normal direction to set the surface A of the CC lens 10 to the front surface (step 145), and then the processing of step 141 is performed. In this way, the refraction states in the observation optical path of the astigmatism correction optical system which is the first refraction inspection optical system and the CC lens 10 which is the second refraction inspection optical system are changed according to a preset procedure.

When the response switch 17 is not turned on in step 142, the CC axis rotation motor 11 is rotated to rotate the intermediate axis of the CC lens 10 by 45 ° with respect to the axis of the cylindrical lens 6 (step 151). .

Then, the CC lens reversing motor 12 is reversed.
After the B surface of the CC lens 10 is set to the front surface (step 152), the CC lens reversing motor 12 is normally rotated and the A surface of the CC lens 10 is set to the front surface (step 153).

At this time, when the response switch 17 is turned on as a result of comparison of sharpness by the subject (step 15).
4) The astigmatic drive motor 8 is rotated to set the cylindrical lens 6 that is strong by -0.25 minutes (step 155), and the process returns to step 152. In this way, the refraction state in the observation optical path of the astigmatism correction optical system that is the first refraction inspection optical system is changed according to the preset procedure.

As a result of comparison of sharpness by the subject, when the response switch 17 is not turned on in step 154, the CC reversing motor 12 is rotated in the reverse direction and the CC lens 10 B
The face is set to the front (step 161).

Here, when the response switch 17 is turned on (step 162), the astigmatism drive motor 8 is rotated in the reverse direction.
The cylindrical lens 6 weak for 0.25 minutes is selected (step 163).
Then, the CC reversing motor 12 is rotated in the normal direction to set the A surface of the CC lens 10 to the front surface (step 164), and the process proceeds to step 16
Set back to 1.

When the response switch 17 is not turned on in step 162, the data is displayed on the CRT 16.
(Step 165).

As described above, the inspection target P is passed through the CC lens 10.
When the response switch 17 is turned on by the subject in a state where the sharpness is superior when the superiority or inferiority of the sharpness is compared between before and after the CC lens 10 is inverted, The step is executed.

In the first step, the axis of the CC lens 10 and the cylindrical axis of the cylindrical lens 6 are rotated by a fixed amount in a predetermined direction.

In the second step, after the axis of the CC lens 10 is separated from the cylindrical axis of the cylindrical lens 6 and rotated by 45 °,
The sharpness is compared again before and after the reversal, and when the response switch 17 is turned on by the subject in the predominant state, the cylindrical lens 6 having a different refractive power is set.

By continuously executing these first and second steps by turning on one response switch 17, the inspection of the astigmatic axis and the degree of astigmatism based on the response of the subject can be performed easily and in a short time. It can be carried out.

FIG. 4 is a block diagram of another embodiment of the present invention. The same elements as those in the embodiment of FIG. 1 are denoted by the same reference numerals, and the far-sightedness correction optical system and the astigmatism correction optical system drive motor are omitted.

The difference from the embodiment of FIG. 1 is that two CC lenses 10a and 10b are provided, and a cross cylinder lens switching motor (hereinafter referred to as "CC switching motor") 40 for switching them. Is provided.

FIG. 5 is an explanatory view of the arrangement of the CC lens shown in FIG. The two CC lenses 10a and 10b have the same optical characteristics, and they are arranged on the same radius with their axes offset from each other by 90 °. The axes of the CC lenses 10a and 10b are the rotary gear train 41,
It is rotated by the CC lens shaft rotation motor 11 via 41 'and switched by the CC switching motor 40 via the switching gear 42.

In this embodiment, when the inspection target P is visually recognized through the CC lenses 10a and 10b alternately and the superiority or inferiority of the sharpness is compared, a response switch is made by the examinee in the dominant state.
When 17 is turned on, the following two steps are performed.

In the first step, the axes of the CC lenses 10a and 10b and the cylindrical axis of the cylindrical lens 6 are rotated by a predetermined angle in a predetermined direction.

In the second step, after the axes of the CC lenses 10a and 10b are separated from the axis of the cylindrical lens 6 and rotated by 45 °, the sharpness comparison between the two CC lenses 10a and 10b is performed again. When the response switch 17 is turned on in the predominant state, the cylindrical lenses 6 having different refractive powers are set on the optical axis.

By continuously executing the first and second steps by turning ON one response switch 17, the astigmatism degree and the astigmatic axis of the subject can be easily and quickly examined.

FIG. 6 is an explanatory view of the arrangement of a cross cylinder lens of still another embodiment of the present invention. As shown in the figure, the two CC lenses 10c and 10d having the same optical characteristics have a cylindrical axis difference of 90.
The test targets are alternately arranged so that they can be visually recognized by the subject's eyes 50.

FIG. 7 is an explanatory diagram of the subject response switch according to the embodiment of FIG. 2 on the response switch 17 'as shown
Two buttons are provided, one corresponding to the CC lens 10c and the other corresponding to 10d.

In this way, the subject compares the superiority and inferiority of the sharpness by the two CC lenses 10c and 10d by slightly shifting the line of sight to the left and right, and the superior CC lens 10
The inspection can be performed by operating the buttons corresponding to c and 10d.

[0057]

As described above, according to the present invention, the first refraction inspecting optical system is driven and controlled by the first lens driving device to change the lens refraction state of the observation optical path, and the invention is driven and controlled by the second lens driving device for observation. A second refraction inspection optical system in which the lens refraction state of the optical path is changed, and control means for operating and controlling both of the drive devices in response to an operation signal from one switch, the control means being operated by the switch. Each time a signal is received, each of the driving devices is controlled so that the refraction state is changed according to a preset procedure. Further, the refraction state of the lens can be sequentially changed according to a preset procedure, and the visual acuity test by the subject or the examiner can be performed easily and in a short time.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is a control block diagram of the embodiment shown in FIG.

FIG. 3 is a flowchart illustrating the operation of the embodiment shown in FIGS. 1 and 2.

FIG. 4 is a configuration diagram of another embodiment of the present invention.

FIG. 5 is an explanatory diagram of an arrangement of the cross cylinder lens in FIG.

FIG. 6 is an explanatory diagram of an arrangement of cross cylinder lenses according to still another embodiment of the present invention.

FIG. 7 is an explanatory diagram of a subject response switch according to the embodiment of FIG.

[Explanation of symbols]

5 ... Cylindrical lens plate (lens mounting plate for first refraction inspection optical system) 6 ... Cylindrical lens (first refraction inspection optical system) 8 ... Astigmatism drive motor (first lens drive device) 9 ... Astigmatism rotation motor (first lens) Driving device) 10 ... CC lens (second refraction inspection optical system) 11 ... CC rotation motor (second lens driving device) 12 ... CC reversing motor (second lens driving device) 13 ... Control unit (control means)

Claims (1)

[Claims] 1. A first refraction inspection optical system in which the lens refraction state of the observation optical path is changed by being controlled by a first lens driving device, and a lens refraction state in the observation optical path is controlled by a second lens driving device. A second refraction inspection optical system to be changed; and a control means for controlling the operation of both drive devices by receiving an operation signal from one switch, the control means each time receiving an operation signal from the switch, A visual acuity test apparatus, characterized in that it is set so as to control each of the driving devices to change each of the refraction states according to a preset procedure.