JPH0588501U - Visual acuity test equipment - Google Patents

Abstract

(57) [Summary] [Purpose] Since the target board has no frame or edge, and no ridgeline appears on the front, it is easy to assimilate with a wall surface, etc., so that natural visual acuity can be accurately and quickly tested. It is an object of the present invention to provide a visual acuity test device capable of performing the above. In a visual acuity test apparatus of a type that illuminates the optotype board 2 from the inside to clearly show the optotype of a desired portion, the portions extending from the front of the optotype board 2 to the left and right side surfaces are curved. . In the above apparatus, the irradiation is performed by a fluorescent lamp with an inverter mechanism. [Effect] Since there are no frames, edges, or ridges that hinder natural visual acuity, natural visual acuity can be correctly and accurately inspected, and fluorescent light with an inverter mechanism is used as an illumination means. The use of the lamp has the effect of speeding up the inspection.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a visual acuity test device, and more particularly, to a visual acuity test device of a type in which only a target portion of a necessary portion is exposed in front by a built-in irradiation device.

[0002]

[Prior Art]

 In the above-mentioned visual acuity test device, a circular target (Landolt ring) or hiragana that is partially cut off is displayed in a milky white board, etc. Several lighting means such as fluorescent lamps are arranged inside, and only the necessary lighting means are normally turned on by remote control so that the visual target can be partially (usually every two steps) clearly indicated. ing.

By the way, there is a demand for further improvement in the accuracy of the visual acuity test recently, but in order to correctly test a natural visual acuity without a feeling of tension, there is something that is annoying to the background and surroundings of the target. It shouldn't be. In other words, it is desirable that the optotype board is not clearly separated from the background, and that only the optotype is exposed in the plain bag. However, in the conventional visual acuity test apparatus, there is an outer frame or an edge surrounding the optotype board, and even when there is no outer frame, a ridge line appears at the boundary between the front surface and the side surface.

[0004]

[Problems to be solved by the device]

 As described above, in the conventional visual acuity testing device, the optotype board has the frame and the edge, and the ridge lines are exposed, so that there is a problem in correctly inspecting the natural visual acuity without tension. It was Further, since the fluorescent lamp used as the illumination means in the conventional device took a long time to light, it was not possible to perform switching lighting quickly, resulting in poor work efficiency.

In view of the above, according to the present invention, since the optotype board has no frame or edge, and no ridgeline appears on the front side, it can be easily combined with a wall surface or the like, and thus a natural visual acuity can be accurately and quickly inspected. It is an object of the present invention to provide a visual acuity test device capable of performing the above.

[0006]

[Means for Solving the Problems]

 The present invention is a visual acuity test apparatus of the type in which the target board is illuminated from the inside so as to clearly indicate the target part, and the part extending from the front side to the left and right side surfaces of the target board is curved. The above problems are solved by a visual acuity test apparatus characterized by the above, and a visual acuity test apparatus characterized in that in the above apparatus, the irradiation is performed by a fluorescent lamp with an inverter mechanism.

[0007]

[Work]

 In the visual acuity test apparatus according to the present invention, since the optotype board has no frame or edge, and both sides of the front surface are curved, the boundary is less noticeable, and the optotype board is attached to the back wall surface or the like. It is easy to assimilate and you can correctly test your natural vision. Further, since the fluorescent lamp with the inverter mechanism is used as the illumination means, the switching lighting time is shortened and the inspection efficiency is improved.

[0008]

【Example】

 A preferred embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows the appearance of an embodiment of the present invention. In the figure, reference numeral 1 is the main body of the apparatus, and a translucent acrylic board optotype board 2 is usually attached to the front upper part thereof. The optotype board 2 is mounted from the front to the side of the apparatus main body 1, and the portion from the front to the side has a curved surface, for example, an arc shape with a radius of about 5 cm (see FIG. 2). Therefore, the ridgeline that divides the front surface and the side surface does not appear there. On the surface of the optotype board 2, usually, optotypes such as Landolt ring and hiragana are appropriately printed by silk printing.

The optotype board 3 mounted on the lower front half of the apparatus body 1 includes a red optotype 4, a green optotype 5, an astigmatism point group optotype 6, and an astigmatism optotype as required. 7. An unequal image optotype, a cross-diagonal optotype, and a stereoscopic optotype are represented.

Inside the optotype board 2, a plurality of irradiation chambers are provided so as not to leak light, and an illumination unit is installed in each irradiation chamber. Those lighting means can be selectively switched on by a remote control switch or the like. In the present invention, a fluorescent lamp with an inverter mechanism is used as the illumination means. In the case of the fluorescent lamp with the inverter mechanism, the fluorescent lamp is turned on instantly, so that it takes no time to switch and turn on during inspection, and the inspection efficiency can be greatly improved.

[0011]

[Effect of the device]

 Since the present invention is as described above, since there are no frames, edges, or ridges that hinder the natural visual acuity, natural visual acuity can be correctly and accurately inspected. Using a fluorescent lamp with an inverter mechanism as a means has the effect of speeding up the inspection.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention.

FIG. 2 is a plan view of an embodiment of the present invention.

[Explanation of symbols]

 1 Device Main Body 2 Target Board 3 Target Board 4 Red Target 5 Green Target 6 Astigmatism Point Group Index 7 Astigmatism Target

Claims (2)

[Scope of utility model registration request] 1. A visual acuity test apparatus of a type in which a target board is illuminated from the inside to clearly show a target part of a target portion, and a part extending from the front to the left and right side surfaces of the target board is curved. A visual acuity test device characterized in that 2. A visual acuity test apparatus of the type in which a visual target board is illuminated from the inside to clearly indicate the visual target of a desired portion, wherein the illumination is performed by a fluorescent lamp with an inverter mechanism. Inspection equipment.