JP3276618B2 - Visual function testing device - 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 function testing apparatus, and more particularly, to a visual function testing apparatus such as a subjective optometric apparatus which performs a visual function test of an eye to be examined in a subjective manner.

[0002]

2. Description of the Related Art In a subjective optometry apparatus which performs a visual function test of an eye to be examined in a subjective manner, a near-point rod which is rotatably mounted on an optometry means (vision tester) for inspecting the visual function of the eye to be examined is used. In general, a near vision test is performed by inserting the supported near vision target into the optical path leading to the optometry unit.

[0003]

However, in the case of the conventional subjective optometry apparatus, the near vision target is always arranged at a predetermined position in front of the optometry means and cannot move or move up and down. A visual function test could not be performed with a progressive lens attached to the test frame.

[0004] Conventionally, it has been attempted to have a subject read a newspaper or the like to perform a near vision test. However, in this case, the visual acuity value of the eye to be examined cannot be measured.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a visual function inspection apparatus which has good operability and can perform various visual function tests.

[0006]

The present invention comprises a table,
And a vertically movable support which is fixedly provided on the table, this
And a near vision target supported movably on the support member, so that the vertical movement and the tilt movement can be individually performed .

(Operation) The operation of the visual function inspection apparatus having the above-described configuration will be described below.

[0008] The near vision target is supported by a vertically movable support and can be moved up and down, and can be individually tilted and operable. When performing an inspection, position it perpendicular to the visual axis
It is possible to be.

[0009]

Embodiments of the present invention will be described below in detail.

The visual function inspection apparatus 1 shown in FIG. 1 includes an optometry table 2 having an L-shaped planar shape.

A column 4 is erected at the end of the optometry table 2 and an arm 5 attached to the column 4 supports a optometry unit 6 for subjective optometry. The reflecting member 3 with the external mirror 7 constituting the optotype optical system 10 is opposed to the optometry unit 6 near the optometry window 6a.

Further, as shown in FIG. 1, inside the optometry table 2, a visual acuity table display means 8 for displaying a distance visual target such as a Landolt mark M for visual function test, and this visual acuity table display means An opening 9 provided in the optometry table 2 with a light beam from
Target optical system 1 that reflects light from the mirror toward the external mirror 7
The first to fifth mirrors 13 to 17 are disposed.

That is, the optotype optical system 10 includes a first mirror 13 facing the visual acuity table display means 8 and the first mirror 1.
A second mirror 14 disposed below the third mirror 3, a third mirror 15 for reflecting the light beam from the second mirror 14 upward,
A fourth mirror 16 that reflects the light beam from the third mirror 15 in the same direction as the table surface of the optometry table 2, and reflects the light beam from the fourth mirror 16 toward the external mirror 7 through the opening 9. And a fifth mirror 17.

As shown in FIG. 2, the reflecting member 3 has a rotating cylinder 3a at an end thereof, and the rotating cylinder 3a is horizontally moved from a vertical support 21 erected from the optometry table 2. It is fitted to a horizontal arm 22 projecting in the direction. The vertical support 21 is driven vertically in a vertical direction by a vertical drive unit (not shown).

On the back side of the reflecting member 3, a chart plate 25 provided with a near target is supported along the reflecting member 3, and a chart provided with a near target in a moving area of the reflecting member 3. A near visual target presenting mechanism 26 is provided for inserting and removing the plate 25 in the optical path to the optometry unit 6 in a state where the plate 25 can be adjusted.

The near visual target presenting mechanism 26 includes a pair of guide rails 27a and 27b arranged in parallel on the back side of the reflecting member 3 at an interval, and the guide rails 27a and 27b.
b, and a slide 28 which is guided in a direction approaching or separating from the optometry means 6.
The end portion of the chart plate 25 is rotatably mounted on the control panel. Further, a scale 29 is attached to the guide rail 27a as a guide for knowing the movement position of the chart plate 25.

With such a configuration, the chart plate 25 provided with the near vision target is, as shown in FIG.
On the back side of the reflecting member 3, it is possible to move in a direction (X1, X2 directions) approaching or separating from the optometry means 6 and, as shown in FIG. I have.

Next, the operation of the visual function inspection device 1 will be described mainly with reference to the operation of the near visual target presenting mechanism 26 and also with reference to FIGS.

In the visual function inspection apparatus 1, when performing a far vision inspection of the eye E, the near vision target presenting mechanism 26 is not operated, and as shown in FIG. 7 is opposed to the optometry means 6. As a result, the light beam from the visual acuity table display means 8 passes through the first mirror 13, the second mirror 14, the third mirror 15, the fourth mirror 16, the fifth mirror 17, and then reaches the external mirror 7. The light enters the eye E through the optometry unit 6 from the external mirror 7. Thereby, the far vision inspection of the eye E can be performed.

On the other hand, when performing a near-inspection of the eye E, as shown in FIG. 4, the reflecting member 3 is slightly lowered from the side of the optometry means 6 to be horizontally arranged. Then, the near vision target presenting mechanism 26 is operated to displace the slide body 28 along the guide rails 27a and 27b using the scale 29 as a guide, and the chart plate 25 is vertically arranged with the slide body 28 as a fulcrum. The near vision target attached to the chart plate 25 is made to face the optometry unit 6. Thus, the near-inspection of the eye E can be performed with good operability only by a simple operation of the chart plate 25. Further, since the chart plate 25 is arranged along the reflection member 3, it is possible to save space as compared with the conventional example.

When a near-inspection is performed by wearing a test frame 30 having a progressive lens attached to the eye E,
As shown in FIG. 5, the optometry unit 6 is removed, and the chart plate 2 is removed.
5 can be set in the direction of the arrow α so that the line of sight of the eye to be examined E that has passed through the progressive lens is vertically incident on the near target. Accordingly, when a visual function test is performed by attaching a progressive lens to the test frame 30, the accuracy can be improved.

Next, another example of the near vision target presenting mechanism 26 will be described with reference to FIGS.

The near visual target presenting mechanism 26A shown in FIG.
The chart plate 40 provided with the near target is configured to be independent of the reflecting member 3.

That is, the near visual target presenting mechanism 26A has a movable support 41 attached to the vertical support 21 so as to be displaceable in the vertical direction by electric or manual operation, and projects from the movable support 41 in the horizontal direction. A horizontal arm 42 provided and a rotating body 43 rotatably fitted to the horizontal arm 42 are provided, and one end of a chart plate 40 provided with a near visual target is attached to the rotating body 43.

In the case of the near visual target presenting mechanism 26A of this configuration, as shown in FIG. 7, the near visual target presenting mechanism 26A with the external mirror 7 of the reflecting member 3 facing the optometry means 6.
Is operated to lower the movable support 41 to a predetermined position below the reflecting member 3, and rotate the rotating body 43 and the chart plate 40 by almost one turn, thereby moving the near target attached to the chart plate 40 to the external mirror 7. The near vision examination of the eye E can be performed over a wider examination distance than the near vision target presenting mechanism 26. That is, it becomes possible to cope with a near-inspection test of each eye E to be examined having individual differences.

The present invention is not limited to the embodiments described above, and various modifications can be made within the scope of the invention.

[0027]

According to the present invention described in detail above, the above-described configuration provides good operability and various visual functions such as performing a visual function test by mounting a progressive lens on a test frame. Inspection can be performed.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of an apparatus according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a reflecting member and a near vision target presenting mechanism of the apparatus of the embodiment.

FIG. 3 is a partially enlarged view showing a state of a long-distance inspection of the apparatus of the embodiment.

FIG. 4 is a partially enlarged view showing a state of a near vision inspection of the apparatus of the present embodiment.

FIG. 5 is a partially enlarged view showing a state of a near vision inspection using a test frame of the apparatus of the present embodiment.

FIG. 6 is a perspective view showing another example of the near visual target presenting mechanism of the apparatus of the present embodiment.

FIG. 7 is an operation explanatory diagram of another example of the near visual target presenting mechanism of the apparatus of the present embodiment.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 visual function testing device 2 optometry table 3 reflection member 6 optometry means 7 external mirror 8 visual acuity table display means 10 optometer optical system 25 chart plate 26 near optometer presenting mechanism

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) A61B 3/00-3/16

Claims (1)

(57) [Claims] And 1. A table, a vertically movable support which is fixedly provided on the table, tilt operable in the support
A near vision target supported by the vertical movement and the tilt movement.
A visual function inspection device characterized in that it is configured to be able to perform works individually .