JPS61144516A - Visual field meter - Google Patents

Abstract

PURPOSE:To decrease the fatigue feel of a person to be examined and to provide the advantage of a small size by forming a dome to max. 300mm radius of curvature, attaching green light emitting diodes to the visual marks existing spottedly to the dome and forming a layer colored to a dark red purple color on the inside wall surface thereof so that the black spots of the holes for embedding the diodes are made hardly recognizable. CONSTITUTION:The dome 1 having <=300mm, more preferably about 240mm radius of curvature is used. The green light emitting diodes5 are attached to the respective visual marks, 4, 4... except the stationary visual mark 3 of the dome 1. The visual field meter is usually used in a dark room where illumination is made to such an extent as to brighten slightly only the inside wall of the dome. The visual marks which emit the green light are most preferable from the reasons that such marks permit easy viewing by the person to be examined and that the fatigue of the eyes is lessened. The layer 6 colored to the dark red purple color with green as a complementary color is formed on the inside wall surface of the dome 1, by which the disadvantage of the visibility of the holes for embedding the light emitting diode as black spots to the eyes is eliminated. The fatigue feel of the person to be examined with time is thus decreased and the reliability of the inspection result is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a perimeter comprising a relatively small dome with a green light emitting diode as a visual target.

[Conventional technology]

The size of the dome in conventional perimeter perimeters is usually 300 mm in radius because it is easy to fixate when one eye of the subject is directed to a fixation target at a fixed position approximately in the center of the dome. It was set within the range of ~500-. However, having a dome of such a size requires a vast installation area and has various drawbacks, such as significantly reducing the workability of the oilator.

On the other hand, the present inventors have determined that the r-m radius is 300 m.
For example, we have developed a 240-fi perimeter with a structure in which a light emitting diode is embedded in each visual target and the diode is blinked automatically or manually. In addition, it is small and lightweight and easy to operate, and the dome can be easily moved up, down, forward, backward, left and right, and the fixation target can be moved according to the standards of the subject fixed in advance. It has been found that this method has many advantages, such as reducing the examiner's pain and allowing much more accurate visual field data to be obtained.

However, when compared to a perimeter with a dome radius of 300 m or more, the number of light emitting diodes per unit area of the dome increases rapidly (for example, a dome with a radius of 330 m and a dome with a radius of 240 m + are 1.5 m in radius and 1.5 m in radius, respectively). 89 times the inner wall surface area), the embedded holes for the light emitting diodes in each optotype, which were not very noticeable when using a perimeter with a radius of 300 m or more, were recognized by the examinee as a black spot, and the examinee's feeling of fatigue increased over time. It was found that there are disadvantages such as an increase in

[Problem that the invention seeks to solve]

The present invention is aimed at a perimeter with a dome radius of 300 mm or less, and is designed to almost completely eliminate the relatively conspicuous sunspots caused by the embedded holes of the diodes in the dome, thereby reducing the subject's sense of fatigue. Moreover, the present invention aims to provide a perimeter that fully takes advantage of its small size.

[Means for solving problems]

The present invention is directed to a) a dome with a maximum radius of curvature of 300 m, which is much smaller than that of a conventional perimeter; A green light emitting diode with the highest visibility wavelength was selectively attached to the examiner, and a dark reddish-purple colored layer was formed on the inner wall surface of the dome, with the color complementary to the green mentioned above. In addition to making it easier and more reliable to confirm the green color of the target, when it is not emitting light, the embedded hole of each optotype will be recognized by the examinee as a black spot, reducing the pain of the examinee and making the examination easier. It is an attempt to solve the above-mentioned problems with a configuration that improves the reliability or accuracy of the system.

〔Example〕

The present invention will be described below based on embodiments with reference to the drawings.

FIGS. 1<i), (Ji), and GiD are a front view, a side sectional view, and an enlarged sectional view of essential parts, respectively, of an embodiment of a perimeter according to the present invention.

This perimeter has a dome 1 and a support base 2 that supports the dome, and also has a chin rest and a forehead rest (not shown) for fixing the subject's head. The dome 1 is arranged to move independently of the chin rest and forehead rest. In order to match the standard of the subject whose head is fixed with the fixation target 3 of the dome, the small perimeter according to the present invention moves the dome itself back and forth,
It has a dome moving device that moves left and right or up and down, but since these are not directly related to the present invention, detailed explanations will be omitted.

The dome of the perimeter according to the present invention has a radius of curvature of 300 m.
Hereinafter, those with around 240 fins are preferably targeted.

Next, in the present invention, each visual target other than the fixation target on the dome 1 4.4. A light emitting diode 5 as shown in FIG. 1 GiD is attached to . . . , and the diode emits green light. This diode has a color peak wavelength of 555-565 nanometers.

Normally, the perimeter is used in a dark room, and the illumination is such that only the inner wall of the dome is slightly bright (for example, the back luminance is 31.5 apostillum), but each target that emits green light is This is most preferable because it particularly facilitates visual recognition by the person and reduces eye fatigue.

In such a perimeter, an important feature of the present invention resides in that a dark reddish-purple colored layer 6, which is a complementary color to green, is formed on the inner wall surface of the dome 1. That is, it is a dark-colored surface layer that is mainly reddish-purple, and has a hue equivalent to r RP J in the Munsell color system, and is a hue that is displayed as "reddish-purple" in the CIE color system. .

〔Effect of the invention〕

The present invention is based on the above configuration, and first, since it uses a dome with a radius of curvature of 300° or less, it occupies extremely little space in the clinic, is easy to move, and is This system has the advantage that the dome can be moved back and forth, left and right, or up and down in line with the eyes to determine the standard for the fixation target, allowing the visual field test to be performed smoothly and significantly reducing the pain experienced by the examinee. In addition, each optotype is embedded with a green light emitting diode, which is preferable because it is easy for the subject to see and reduces eye fatigue. A deep reddish-purple colored layer, which is a complementary color and is almost black, is formed, so that when the wall surface is conventionally white, the hole where the light emitting diode is embedded becomes a black dot, which is visible to the examinee. This eliminates the shortcomings of test subjects, significantly reducing fatigue over time and greatly increasing the reliability of test results.In addition, the light-emitting diode, which emits green light when energized, has a complementary color. It can be seen particularly clearly on the related dark reddish-purple inner wall of the dome, and furthermore, while the conventional perimeter had to be used in a dark room, the perimeter according to the present invention
Since it does not have the brightness of a white inner surface, it does not necessarily have to be installed in a dark room; it can be used in a reasonably dark club room, and therefore, it can be used in areas separated by blackout curtains. The perimeter of the present invention has many advantages, such as being very convenient.

[Brief explanation of drawings]

1(i), (Ii), and 6iD are a front view, a side sectional view, and an enlarged sectional view of essential parts, respectively, of an embodiment of a perimeter according to the present invention. DESCRIPTION OF SYMBOLS 1... Dome, 3... Fixation target, 4... Other visual target, 5... Light emitting diode, 6... Colored layer Fig. 1 (
1) Figure 1 (ii) Figure 1 (iii)

Claims (1)

[Claims] It is a perimeter meter in which the dome has a maximum radius of curvature of 300 mm and green light emitting diodes are attached to each optotype scattered around the dome, and a dark reddish-purple colored layer with green as a complementary color is formed on the inner wall surface of the dome. A visual field meter characterized by: