JPS6137129A - Sight fatique measuring instrument - Google Patents
Sight fatique measuring instrumentInfo
- Publication number
- JPS6137129A JPS6137129A JP15807984A JP15807984A JPS6137129A JP S6137129 A JPS6137129 A JP S6137129A JP 15807984 A JP15807984 A JP 15807984A JP 15807984 A JP15807984 A JP 15807984A JP S6137129 A JPS6137129 A JP S6137129A
- Authority
- JP
- Japan
- Prior art keywords
- dynamic
- refractometer
- visual fatigue
- response
- measuring device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 208000003464 asthenopia Diseases 0.000 claims description 15
- 230000010354 integration Effects 0.000 claims 1
- 238000005259 measurement Methods 0.000 description 9
- 230000000007 visual effect Effects 0.000 description 5
- 230000004308 accommodation Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000012935 Averaging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 210000001525 retina Anatomy 0.000 description 2
- 230000002350 accommodative effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 208000029257 vision disease Diseases 0.000 description 1
- 230000004304 visual acuity Effects 0.000 description 1
- 230000004393 visual impairment Effects 0.000 description 1
Landscapes
- Eye Examination Apparatus (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、視覚疲労を他覚的に測定するようにした視覚
疲労測定器に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a visual fatigue measuring device that objectively measures visual fatigue.
従来の技術
Ｖ Ｄ Ｔ （Ｖｉｓｕａｌ Ｄｉｓｐｌａｙ Ｔｅｒ
ｍｉｎａｌ ：画面表示装置付計算機端末）の普及に伴
い、それを毎日長時間使用する人の数が急増したことに
より、種々の視覚障害が訴えられている。Conventional technology VDT (Visual Display Ter)
With the spread of computer terminals (minal: computer terminals with screen display devices), the number of people who use them for long hours every day has rapidly increased, leading to complaints of various visual impairments.
従者、このような作業に伴う疲労の測定法は、視力、近
点、フリッカ−測定等、被験者の主観的な応答を用いて
測定する自覚的測定で行われており、そのため測定精度
が悪く、測定時間がかかるという問題をもっていた。Measuring fatigue associated with such work is done through subjective measurements that use the subject's subjective responses, such as visual acuity, near point, and flicker measurements, which results in poor measurement accuracy. The problem was that it took a long time to measure.
しかるに、最近、第３図に示すような光学装置を用いて
眼の屈折力の動的な変化を瞬時に連続して、しかも他覚
的に測定できる装置が開発された。However, recently, a device has been developed that can instantaneously, continuously, and objectively measure dynamic changes in the refractive power of the eye using an optical device as shown in FIG.
この装置の概要について説明すると、第３図かられかる
ように、交互に発光する赤外発光ダイオードＬＥＤの光
は、レンズＬｌ及びＬ２を通って網膜上に絞りＤの像を
投影し、その像の反射光は、レンズＬ、３〜Ｌ７を通っ
て集光され、フォトセルＰＣ−ヒに第２の像がつくられ
る。これらの像を利用するために、絞りＤとレンズＬＢ
は、網膜上に二つの像を一致させて位置させるようにサ
ーボコントロールされる。To explain the outline of this device, as shown in FIG. The reflected light passes through the lenses L, 3 to L7 and is focused to form a second image on the photocell PC-H. In order to utilize these images, aperture D and lens LB
is servo-controlled to align the two images on the retina.
屈折力は、゛絞りＤ及びレンズの移動量から算出される
。レンズＬ３．Ｌ８及びＬ８は、バダルレンズ・システ
ムを構成し、眼の調節作用にもかかわらず、網膜上にお
ける視標の像の大きさを一定に保。The refractive power is calculated from the aperture D and the amount of movement of the lens. Lens L3. L8 and L8 constitute the Badal lens system, which maintains the size of the target image on the retina constant despite the accommodation action of the eye.
つように修正される。レンズＬＩＯ，ＬＬＩ及びビーム
スプリッタＢＳ３は、セツティング用の眼のモニタを構
成するものである。It will be corrected as follows. Lenses LIO, LLI and beam splitter BS3 constitute an eye monitor for setting.
第４図は、このような光学装置を用い、視標をゆっくり
遠くから近くに移動した時の典型的な調節反応を示すも
ので、ＯＨは仕事前の応答を、３Ｈは３時間のＶＤＴ連
続作業を行った時の応答を示している。また、第５図は
ステップ状に視標を動かした場合の調節反応を示し、同
様に仕事前及び３昨間のＶＤＴ作業後の応答に０）１．
３Ｈとして示している。Figure 4 shows a typical accommodative response when the visual target is slowly moved from far to near using such an optical device. It shows the response when the work is done. Furthermore, Figure 5 shows the accommodation response when the optotype is moved in a stepwise manner, and similarly, the response before the task and after the VDT task for the past 3 days is 0) 1.
Shown as 3H.
このような測定結果によると、第４図に示すような、視
標のゆっくりした変化に対する応答（ランプ応答）は、
ＶＤＴ作業前後で明白な変化を示さないが、第５図に示
すような、視標の急激な変化に対する応答（ステップ応
答）には、種々の特徴ある変化があられれる。According to these measurement results, the response to slow changes in the visual target (ramp response) as shown in Figure 4 is as follows:
Although there are no obvious changes before and after the VDT operation, there are various characteristic changes in the response (step response) to a sudden change in the visual target, as shown in FIG.
それらの特徴ある変化をまとめると、以下の６点になる
。These characteristic changes can be summarized in the following six points.
（Ａ）無駄時間の増加、
（Ｂ）立上り時間の増加、
（Ｃ’）近点近傍への調節保持が困難になる回数の増加
、
（Ｄ）調節誤差の増加、
（Ｅ）瞬目の増加、
（Ｆ）遠点の近方への移動、
而して、一般に人間の反応は個人差、時間変動共へに大
きいので、上記（Ａ）〜（Ｆ）の計量値を直接用いると
ばらつきの大きい測定値となり、利用か困難なものにな
る。(A) Increase in dead time, (B) Increase in rise time, (C') Increase in number of times it becomes difficult to maintain accommodation near the near point, (D) Increase in accommodation error, (E) Increase in blinks. , (F) Movement of the far point to the near side.In general, human reactions have large individual differences and temporal fluctuations, so direct use of the metric values of (A) to (F) above will reduce the variation. This results in a large measurement value, making it difficult to use.
発明か解決しようとする問題点
本発明は、上記８４図における第４波形に斜線を引いて
示したような特定領域についての積分値に対し、ランダ
ムに出現する上記（Ａ）〜（Ｆ）の特徴波形か全てその
積分値を減少させるように作用することに着目し、視覚
疲労をその積分値の減少により安定した計測値として表
すようにした視覚疲労測定器を提供しようとするもので
ある。Problems to be Solved by the Invention The present invention solves the problem of the above (A) to (F) that appear randomly with respect to the integral value for a specific area as indicated by diagonal lines in the fourth waveform in Fig. 84 above. Focusing on the fact that all characteristic waveforms act to decrease their integral values, the present invention attempts to provide a visual fatigue measuring device that expresses visual fatigue as a stable measurement value by decreasing its integral value.
徊題点を解決するための手段
かかる目的を達成するため、本発明の視覚疲労測定器は
、眼の屈折力の動的な変化を実時間で計測する動的屈折
力計に、その出力に対して数回のステップ応答における
遠点の平均値を底とし、視標の立ち下り及び応答波形と
によって囲まれる面積に相当する値を積分によって求め
る積分手段を接続し、さらにその計算結果を表示する表
示装置を設けることにより構成される。Means for Solving the Problems In order to achieve the above object, the visual fatigue measuring device of the present invention is a dynamic refractometer that measures dynamic changes in the refractive power of the eye in real time. In contrast, an integrator is connected to obtain a value corresponding to the area surrounded by the falling edge of the optotype and the response waveform by integral, with the average value of the far point in several step responses as the base, and the calculation result is displayed. It is configured by providing a display device that
作 用
上記構成を有する本発明の視覚疲労測定器によれば、動
的屈折力計の出力から、数回のステップ応答における遠
点の平均値を底とし、視標の立ち下り及び応答波形とに
よって囲まれる面積に相当する値として、視覚疲労を客
観的かつ定量的に、しかも安定的に計測表示することか
できる。According to the visual fatigue measuring device of the present invention having the above configuration, from the output of the dynamic refractometer, the average value of the far point in several step responses is taken as the bottom, and the fall of the optotype and the response waveform are determined. Visual fatigue can be objectively, quantitatively, and stably measured and displayed as a value corresponding to the area surrounded by .
実施例
第１図は、本発明に係る視覚疲労測定器の実施例を示す
ものである。この視覚疲労測定器は、第４図の第４の波
形の斜線部分のように、作業前に測定した数回のステッ
プ応答における遠点の平均値を底（１）とし、視標の立
ち下り（２）、及び応答波形（３）とによって囲まれる
部分の面積に対し、ランダムに出現する前記（Ａ）〜（
Ｆ）の特徴波形が全てその面積を減少させるように作用
することに、着目し、視覚疲労をその面積の減少により
安定したｉ４測値として客観的、定量的に表すようにし
たもので、以下にその構成及び作用について説明する。Embodiment FIG. 1 shows an embodiment of the visual fatigue measuring device according to the present invention. This visual fatigue measuring device uses the average value of the far point in several step responses measured before the task as the base (1), as shown in the shaded part of the fourth waveform in Figure 4, and the fall of the visual target. (2) and the response waveform (3), the above (A) to (
Focusing on the fact that all of the characteristic waveforms in F) act to reduce the area, visual fatigue is expressed objectively and quantitatively as an i4 measurement value that is stable due to the reduction of the area. Its structure and operation will be explained below.
まず、眼の゛屈折力の動的な変化を実時間で・計測する
動的屈折力計としては、第３図に例示するような従来か
ら公知のものが用いられ、その出力である屈折力が、ゲ
ートを通して積分器に送られる。上記ゲートは、動的屈
折力計からのゲート信号に基づき、第２図のタイミング
チャートに示すように、視標の立ち上り直後に開き、視
標の立ち下りに対応して、閉じられるものである。First, as a dynamic refractometer that measures dynamic changes in the refractive power of the eye in real time, a conventionally known dynamic refractometer, as illustrated in Figure 3, has been used, and its output is the refractive power. is sent to the integrator through the gate. Based on the gate signal from the dynamic refractometer, the gate opens immediately after the optotype rises and closes in response to the fall of the optotype, as shown in the timing chart of Figure 2. .
このゲートを通じて積分器に送られた屈折力計の化力は
、予め測定した数回のステップ応答における遠点の平均
値を底として積分されるが、前部（Ｆ）の効果をも算入
するためには、直前の遠点と基準時の平均遠点とを比較
して、直前の遠点の方が被験者に近い場合、積分の底を
変更する必要がある。第１図における比較器は、上記比
較を行い、その結果に基づいて直流電源を制御し、屈折
力計の出力に対して積分の底の変更に相当する電圧の加
算を行うためのものである。The power of the refractometer sent to the integrator through this gate is integrated using the average value of the far point in several step responses measured in advance as the base, but the effect of the front part (F) is also taken into account. In order to do this, it is necessary to compare the immediately preceding far point and the average far point at the reference time, and if the immediately preceding far point is closer to the subject, the base of the integral must be changed. The comparator in Figure 1 is for performing the above comparison, controlling the DC power supply based on the result, and adding a voltage corresponding to changing the base of the integral to the output of the refractometer. .
上記積分器の出力は、眼精疲労を他覚的、定量的に表す
ものであり、必要に応じて加算平均回路を設けて加算平
均を行い、さらに割算器を設けてそ・の出力を刺激幅で
割ることにより規格化し、その結果を表示器により表示
させる。上記積分器及び表示器等は、動的屈折力計から
のリセット信号により、第２図に示すようなタイミング
でリセットされる。The output of the above-mentioned integrator objectively and quantitatively represents eye strain. If necessary, an averaging circuit is provided to perform the averaging, and a divider is further provided to calculate the output. It is normalized by dividing by the stimulus width, and the result is displayed on a display. The integrator, display, etc. are reset at the timing shown in FIG. 2 by a reset signal from the dynamic refractometer.
、なお、上述した測定回路は、マイクロコンピュータを
用いることによっても容易の実現することができる。Note that the above-mentioned measurement circuit can also be easily realized by using a microcomputer.
発明の効果
以−ヒに詳述したところから明らかなように、本発明の
視覚疲労測定器によれば、視覚疲労を他覚的かつ定量的
に、しかも安定的に計測表示することができる。Effects of the Invention As is clear from the detailed description below, the visual fatigue measuring device of the present invention can measure and display visual fatigue objectively, quantitatively, and stably.
第１図は本発明に係る視覚疲労測定器のブロック構成図
、第２図は第１図の測定器における信号のタイミングチ
ャート、第３図は動的屈折力計についての説明図、第４
図及び第５図は第３図の屈折力計による計測結果を示す
線図である。
（１）・・遠点の平均値からなる積分の底、（２）Φφ
視標の立ち下り、
（３）・・応答波形。
指定代理人
工業技術院製品科学研究所長
高橋枚司
第 １ 図
第３図
第４図
第５図FIG. 1 is a block configuration diagram of a visual fatigue measuring device according to the present invention, FIG. 2 is a timing chart of signals in the measuring device of FIG. 1, FIG. 3 is an explanatory diagram of a dynamic refractometer, and FIG.
The figure and FIG. 5 are diagrams showing the measurement results by the refractometer shown in FIG. 3. (1)...The base of the integral consisting of the average value of the far point, (2) Φφ
Falling of the optotype, (3)...Response waveform. Designated Representative: Director, Product Science Research Institute, Agency of Industrial Science and Technology, Tsukasa Takahashi, Figure 1, Figure 3, Figure 4, Figure 5.
Claims (1)
折力計に、その出力に対して数回のステップ応答におけ
る遠点の平均値を底とし、視標の立ち下り及び応答波形
とによって囲まれる面積に相当する値を積分によって求
める積分手段を接続し、さらにその計算結果を表示する
表示装置を設けたことを特徴とする視覚疲労測定器。1. A dynamic refractometer that measures dynamic changes in the refractive power of the eye in real time is used to measure the output of the dynamic refractometer, with the average value of the far point in several step responses as the base, and the falling and 1. A visual fatigue measuring device, characterized in that it is connected to an integrating means for obtaining a value corresponding to an area surrounded by a response waveform by integration, and is further provided with a display device for displaying the calculation result.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15807984A JPS6137129A (en) | 1984-07-27 | 1984-07-27 | Sight fatique measuring instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15807984A JPS6137129A (en) | 1984-07-27 | 1984-07-27 | Sight fatique measuring instrument |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6137129A true JPS6137129A (en) | 1986-02-22 |
| JPH0471531B2 JPH0471531B2 (en) | 1992-11-16 |
Family
ID=15663833
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15807984A Granted JPS6137129A (en) | 1984-07-27 | 1984-07-27 | Sight fatique measuring instrument |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6137129A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07255669A (en) * | 1994-03-24 | 1995-10-09 | Sony Corp | Eye condition detector and indicator |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IL130818A (en) | 1999-07-06 | 2005-07-25 | Intercure Ltd | Interventive-diagnostic device |
-
1984
- 1984-07-27 JP JP15807984A patent/JPS6137129A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07255669A (en) * | 1994-03-24 | 1995-10-09 | Sony Corp | Eye condition detector and indicator |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0471531B2 (en) | 1992-11-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |