JPH0751228A - Eyesight testing device - Google Patents
Eyesight testing deviceInfo
- Publication number
- JPH0751228A JPH0751228A JP5204002A JP20400293A JPH0751228A JP H0751228 A JPH0751228 A JP H0751228A JP 5204002 A JP5204002 A JP 5204002A JP 20400293 A JP20400293 A JP 20400293A JP H0751228 A JPH0751228 A JP H0751228A
- Authority
- JP
- Japan
- Prior art keywords
- semi
- mirror
- transparent mirror
- target
- concave mirror
- 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
Landscapes
- Eye Examination Apparatus (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、外乱光の影響を極力低
減して視力検査精度の向上を図ることができる視力検査
装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a visual acuity test apparatus capable of minimizing the influence of ambient light and improving the accuracy of visual acuity test.
【０００２】[0002]
【従来の技術】従来から、視力検査装置には、筺体内に
視標と凹面鏡とを設置すると共に、この視標と凹面鏡と
の間に半透鏡を介在させ、半透鏡を透過させて視標を凹
面鏡に投影し、凹面鏡に投影された視標を半透鏡により
反射させて、視標の像を被検者に呈示するものが知られ
ている。2. Description of the Related Art Conventionally, a visual acuity test apparatus is provided with a target and a concave mirror inside a housing, and a semi-transparent mirror is interposed between the target and the concave mirror to allow the semi-transparent mirror to pass therethrough. It is known to project an image of a target onto a concave mirror and reflect the target projected on the concave mirror with a semi-transparent mirror to present an image of the target to a subject.
【０００３】この従来の視力検査装置では、視標と半透
鏡との間でかつ視標の近傍に偏光板が視標照明光学系の
光路に進退可能に設けられている。In this conventional visual acuity test apparatus, a polarizing plate is provided between the optotype and the semi-transparent mirror and in the vicinity of the optotype so as to be able to move forward and backward in the optical path of the optotype illumination optical system.
【０００４】両眼視機能の検査においては、被検者は偏
光メガネを装用してあるいはビジョンテスター等の偏光
レンズを装用して検査を受けることになっている。In the inspection of the binocular vision function, the subject is supposed to take the inspection by wearing polarized glasses or a polarized lens such as a vision tester.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、従来の
視力検査装置では、蛍光灯等の外乱光が筺体内に入射
し、この外乱光が半透鏡により反射されて凹面鏡に導か
れ、この凹面鏡により反射された外乱光が再び半透鏡に
より反射されて、被検者に向かって出射される。However, in the conventional visual acuity test apparatus, disturbance light such as a fluorescent light enters the housing, and the disturbance light is reflected by the semi-transparent mirror and guided to the concave mirror, and reflected by the concave mirror. The disturbed light thus reflected is again reflected by the semi-transparent mirror and emitted toward the subject.
【０００６】このため、被検者は呈示された視標を視認
する際に、外乱光の影響を受けることになり、従来の視
力検査装置では、半透鏡の透過率Ｔと反射率Ｒとの比率
が５：５に設定されているので、外乱光の入射光量を１
とすると、半透鏡による２回反射により、その外乱光の
１／４の光量が戻ってくる（凹面鏡の反射率を考慮から
除く）ことになり、外乱光の影響が極めて大きい。Therefore, the subject is affected by the ambient light when visually checking the presented target, and in the conventional visual acuity test apparatus, the transmittance T and the reflectance R of the semi-transparent mirror are compared. Since the ratio is set to 5: 5, the incident light quantity of ambient light is 1
Then, due to the double reflection by the semi-transparent mirror, the light amount of 1/4 of the disturbance light is returned (excluding the reflectance of the concave mirror from consideration), and the influence of the disturbance light is extremely large.
【０００７】一方、半透鏡の透過率と反射率との比率を
異ならせることにすると、両眼視機能検査に支障が生じ
るおそれがある。On the other hand, if the transmissivity and the reflectivity of the semi-transparent mirror are made different, there is a possibility that the binocular visual function test may be hindered.
【０００８】本発明は、上記の事情に鑑みて為されたも
ので、その目的とするところは、外乱光の影響を極力低
減して視力検査精度の向上を図ることができる視力検査
装置を提供することにある。The present invention has been made in view of the above circumstances. An object of the present invention is to provide a visual acuity test apparatus capable of reducing the influence of ambient light as much as possible and improving the visual acuity test accuracy. To do.
【０００９】本発明の他の目的は、両眼視機能検査に支
障を生じることなく外乱光の影響を極力低減して視力検
査精度の向上を図ることができる視力検査装置を提供す
ることにある。Another object of the present invention is to provide a visual acuity test apparatus capable of improving the visual acuity test accuracy by minimizing the influence of ambient light without disturbing the binocular visual function test. .
【００１０】[0010]
【課題を解決するための手段】本発明に係わる視力検査
装置は、上記の課題を解決するため、筺体内に視標と凹
面鏡とを設置すると共に、前記視標と前記凹面鏡との間
に半透鏡を介在させ、前記半透鏡を透過させて前記視標
を前記凹面鏡に投影し、該凹面鏡に投影された視標を前
記半透鏡により反射させて、視標の像を被検者に呈示す
る視力検査装置において、前記半透鏡の反射率がその透
過率よりも小さく設定されていることを特徴とする。In order to solve the above-mentioned problems, a visual acuity test apparatus according to the present invention installs a target and a concave mirror in a housing and provides a semi-between the target and the concave mirror. A target is projected through the semi-transparent mirror through the semi-transparent mirror to project the optotype onto the concave mirror, and the optotype projected on the concave mirror is reflected by the semi-transparent mirror to present an image of the optotype to the subject. In the visual acuity test device, the reflectance of the semi-transparent mirror is set to be smaller than its transmittance.
【００１１】[0011]
【作用】本発明に係わる視力検査装置によれば、視標は
半透鏡を透過して凹面鏡に投影される。凹面鏡はその視
標を半透鏡に向けて反射する。視標はその半透鏡の反射
により被検者に呈示される。According to the visual acuity test apparatus of the present invention, the target is transmitted through the semi-transparent mirror and projected onto the concave mirror. The concave mirror reflects its target toward the semi-transparent mirror. The optotype is presented to the subject by the reflection of the semi-transparent mirror.
【００１２】ここで、半透鏡の反射率は透過率よりも小
さいので、外乱光がたとえ入射したとしても、その外乱
光は半透鏡による２回反射により急激に減少する。Here, since the reflectivity of the semi-transparent mirror is smaller than the transmissivity, even if the disturbing light is incident, the disturbing light is rapidly reduced by the double reflection by the semi-transparent mirror.
【００１３】[0013]
【実施例】以下に、本発明に係わる視力検査装置の実施
例を図面を参照しつつ説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a visual acuity test apparatus according to the present invention will be described below with reference to the drawings.
【００１４】図１において、１は筺体である。この筺体
１の内部は暗箱となっている。この筺体１には視標照明
光学系２と凹面鏡３とが設けられている。視標照明光学
系２は光源４、コンデンサレンズ５、拡散板６、視標
７、偏光板８が設けられている。In FIG. 1, reference numeral 1 is a housing. The inside of this housing 1 is a dark box. The housing 1 is provided with a target illumination optical system 2 and a concave mirror 3. The target illumination optical system 2 is provided with a light source 4, a condenser lens 5, a diffusion plate 6, a target 7 and a polarizing plate 8.
【００１５】拡散板６は照明光をやわらげるために使用
され、視標７は拡散板６を介して照明される。視標７に
は複数種のものが準備され、図２はその一例としてのラ
ンドルト環チャートである。The diffusion plate 6 is used to soften the illumination light, and the visual target 7 is illuminated through the diffusion plate 6. A plurality of types of optotypes 7 are prepared, and FIG. 2 is a Landolt ring chart as an example.
【００１６】視標照明光学系２には視標７が選択して挿
入される。偏光板８は視標７の近傍に設けられている。
この偏光板８は両眼視機能検査のときに視標照明光学系
２の光路に挿入される。その偏光板８の設計については
後述する。A target 7 is selected and inserted into the target illumination optical system 2. The polarizing plate 8 is provided near the visual target 7.
This polarizing plate 8 is inserted into the optical path of the target illumination optical system 2 at the time of the binocular visual function test. The design of the polarizing plate 8 will be described later.
【００１７】凹面鏡３と視標照明光学系２との間には、
半透鏡９が照明光学系２の光軸Ｏに対して４５度の角度
で配置されている。この半透鏡９は平行平面ガラス板に
誘電体膜を付着することにより形成される。この半透鏡
９はその透過率と反射率との比率が約７：３になるよう
に設計されている。Between the concave mirror 3 and the target illumination optical system 2,
The semi-transparent mirror 9 is arranged at an angle of 45 degrees with respect to the optical axis O of the illumination optical system 2. The semi-transparent mirror 9 is formed by attaching a dielectric film to a parallel flat glass plate. The semi-transparent mirror 9 is designed so that the ratio of its transmittance and reflectance is about 7: 3.
【００１８】視標７は符号Ｐ１で示すように半透鏡９を
透過して凹面鏡３に投影され、この凹面鏡３により反射
されて符号Ｐ２で示すように再び半透鏡９に向けられ、
この半透鏡９により符号Ｐ３で示すように被検者の左眼
Ｅ１、右眼Ｅ２が存在する方向に反射される。これによ
り、被検者に視標７の像７´が呈示されることになる。
その像７´の呈示位置はこの実施例では被検者の前方約
５ｍの位置である。The optotype 7 is transmitted through the semi-transparent mirror 9 as shown by the symbol P1 and is projected on the concave mirror 3, is reflected by the concave mirror 3 and is again directed to the semi-transparent mirror 9 as shown by the symbol P2.
The semi-transparent mirror 9 reflects the light in the direction in which the left eye E1 and the right eye E2 of the subject are present, as indicated by reference sign P3. As a result, the image 7'of the optotype 7 is presented to the subject.
The presentation position of the image 7'is about 5 m in front of the subject in this embodiment.
【００１９】外乱光は符号Ｐ４で示すように筺体１内に
入射して半透鏡９により反射されて凹面鏡３に導かれ
る。この凹面鏡３により反射された外乱光は符号Ｐ５で
示すように半透鏡９により反射されて被検者に向かうこ
とになるが、半透鏡９の反射率が０．３であるので、半
透鏡９の２回反射により、外乱光Ｐ４の入射時の光量に
対して出射時の光量が約１０分の１（０．０９）程度と
なり、半透鏡９の透過率Ｔに対して反射率Ｒの比率を小
さく設定することにより、外乱光Ｐ４の影響を極力少な
くすることができる。The ambient light enters the housing 1, is reflected by the semi-transparent mirror 9 and is guided to the concave mirror 3, as indicated by the symbol P4. The ambient light reflected by the concave mirror 3 is reflected by the semi-transparent mirror 9 and travels toward the subject as shown by the reference numeral P5. However, since the reflectivity of the semi-transparent mirror 9 is 0.3, the semi-transparent mirror 9 is shown. Due to the double reflection, the light quantity at the time of emission becomes about 1/10 (0.09) with respect to the light quantity at the time of incidence of the disturbance light P4, and the ratio of the reflectance R to the transmittance T of the semi-transparent mirror 9. By setting a small value, the influence of the ambient light P4 can be minimized.
【００２０】すなわち、半透鏡９の反射率を０．５に設
計した従来の場合に較べて、この実施例では、（０．
３）2／（０．５）2＝０．３６であり、従来に較べて外
乱光Ｐ４の影響を約２．８分の１に減少させることがで
きる。That is, compared with the conventional case where the reflectance of the semi-transparent mirror 9 is designed to be 0.5, in this embodiment, (0.
3) 2 /(0.5) 2 = 0.36, and the influence of the ambient light P4 can be reduced to about 2.8 times that of the conventional case.
【００２１】両眼視機能検査を行うときには、被検者は
ビジョンテスターあるいは偏光メガネを装用して視標７
の像７´を視認する。図３において、符号１０は偏光メ
ガネである。この偏光メガネ１０の偏光レンズ１０ａは
右４５度の偏光軸１１を有し、偏光レンズ１０ｂは左４
５度の偏光軸１２を有する。When performing the binocular visual function test, the subject wears a vision tester or polarized glasses and the target 7
The image 7'of is visually recognized. In FIG. 3, reference numeral 10 is polarizing glasses. The polarization lens 10a of this polarization glasses 10 has a polarization axis 11 of 45 degrees to the right, and the polarization lens 10b has a polarization axis of 4 to the left.
It has a polarization axis 12 of 5 degrees.
【００２２】半透鏡９の透過率Ｔと反射率Ｒとの比が
５：５である場合には、以下に説明する理由により、図
４に示すように偏光板８の偏光レンズ１０ａに対応する
半分８ａの偏光軸１３を右４５度に設計し、偏光板８の
偏光レンズ１０ｂに対応する半分８ｂの偏光軸１４を左
４５度に設計すれば、左眼Ｅ１は視標７ａの像のみを視
認でき、右眼Ｅ２は視標７ｂの像のみを視認でき、両眼
視機能検査に支障は生じない。When the ratio of the transmittance T to the reflectance R of the semi-transparent mirror 9 is 5: 5, it corresponds to the polarizing lens 10a of the polarizing plate 8 as shown in FIG. 4 for the reason described below. If the polarization axis 13 of the half 8a is designed to be 45 degrees to the right and the polarization axis 14 of the half 8b corresponding to the polarizing lens 10b of the polarizing plate 8 is designed to be 45 degrees to the left, the left eye E1 can see only the image of the target 7a. It can be visually recognized, and the right eye E2 can visually recognize only the image of the optotype 7b, which does not hinder the binocular visual function test.
【００２３】すなわち、半透鏡９の透過率Ｔと反射率Ｒ
との比が５：５の場合には、Ｐ成分の透過振幅Ｔｐ、Ｓ
成分の透過振幅Ｔｓ、Ｐ成分の反射振幅Ｒｐ、Ｓ成分の
反射振幅Ｒｓは概略以下のごとくになる。That is, the transmittance T and the reflectance R of the semi-transparent mirror 9
When the ratio is 5: 5, the transmission amplitudes Tp, S of the P component
The transmission amplitude Ts of the component, the reflection amplitude Rp of the P component, and the reflection amplitude Rs of the S component are approximately as follows.
【００２４】Ｔｐ＝０．５８、Ｔｓ＝０．４２、Ｒｐ＝
０．４２、Ｒｓ＝０．５８ 従って、Ｐ成分の透過反射振幅は（０．５８×０．４
２）1/2となり、Ｓ成分の透過反射振幅は（０．４２×
０．５８）1/2となり、Ｐ成分の振幅、Ｓ成分の振幅と
も同量となるので、半透鏡９を透過反射した視標照明光
の偏光軸１３、１４の回転はなく、垂直水平に対して４
５度の角度を保ったまま、視標照明光が左眼Ｅ１、右眼
Ｅ２に達することになる。Tp = 0.58, Ts = 0.42, Rp =
0.42, Rs = 0.58 Therefore, the transmission reflection amplitude of the P component is (0.58 × 0.4
2) 1/2 , and the transmission and reflection amplitude of the S component is (0.42 x
0.58) 1/2 , and the amplitudes of the P component and the S component are the same, so that the polarization axes 13 and 14 of the target illumination light transmitted and reflected by the semi-transparent mirror 9 do not rotate, and the vertical and horizontal directions do not occur. To 4
The target illumination light reaches the left eye E1 and the right eye E2 while maintaining the angle of 5 degrees.
【００２５】これに対して、半透鏡９の透過率Ｔと反射
率Ｒとの比が７：３の場合には、Ｐ成分の透過振幅Ｔ
ｐ、Ｓ成分の透過振幅Ｔｓ、Ｐ成分の反射振幅Ｒｐ、Ｓ
成分の反射振幅Ｒｓは概略以下のごとくになる。On the other hand, when the ratio of the transmittance T and the reflectance R of the semi-transparent mirror 9 is 7: 3, the transmission amplitude T of the P component is T.
Transmission amplitude Ts of p and S components, reflection amplitude Rp and S of P component
The reflection amplitude Rs of the component is approximately as follows.
【００２６】Ｔｐ＝０．８３、Ｔｓ＝０．５７、Ｒｐ＝
０．１７、Ｒｓ＝０．４３ 従って、半透鏡９を透過反射した視標照明光のＰ成分の
振幅とＳ成分の振幅との量が異なり、その比により偏光
軸は tan-1（（Ｔｐ×Ｒｐ）1/2／（Ｔｓ×Ｒｓ）1/2）＝ ＝tan-1（（０．１４１）1/2／（０．２４５）1/2）〜
３７．２°となり、レンズ１０ａ、１０ｂの４５°の偏
光軸１１、１２に対してそれぞれ７．８°ずつずれるこ
とになる。Tp = 0.83, Ts = 0.57, Rp =
0.17, Rs = 0.43 Therefore, the amounts of the amplitude of the P component and the amplitude of the S component of the target illumination light transmitted and reflected by the semi-transparent mirror 9 are different, and the polarization axis is tan −1 ((Tp × Rp) 1/2 / (Ts × Rs) 1/2 ) == tan −1 ((0.141) 1/2 /(0.245) 1/2 ) ˜
This is 37.2 °, which means that the lenses 10a and 10b are deviated by 7.8 ° from the 45 ° polarization axes 11 and 12, respectively.
【００２７】従って、偏光板８の偏光軸１３、１４を４
５度に設計すると、両眼視機能検査に支障を生じること
になる。Therefore, the polarization axes 13 and 14 of the polarizing plate 8 are set to 4
If it is designed at 5 degrees, the binocular visual function test will be hindered.
【００２８】そこで、図４に示すように、偏光板８の偏
光軸１３、１４が破線で示すように偏光レンズ１０ａ、
１０ｂの偏光軸１１、１２に対して半透鏡９の反射率値
と透過率値との差異に基づき４５°から約７．８度だけ
あらかじめずらされている。Therefore, as shown in FIG. 4, the polarization axes 13 and 14 of the polarizing plate 8 are polarized lenses 10a, as shown by broken lines.
Based on the difference between the reflectance value and the transmittance value of the semitransparent mirror 9 with respect to the polarization axes 11 and 12 of 10b, they are preliminarily shifted from 45 ° by about 7.8 degrees.
【００２９】このように偏光板８の偏光軸１３、１４を
設計すると、視標の半透鏡９の透過、反射により偏光レ
ンズ１０ａ、１０ｂの偏光軸１１、１２の方向と一致
し、従って、従来通り左眼Ｅ１は視標７ａの像のみを視
認でき、右眼Ｅ２は視標７ｂの像のみを視認できる。When the polarization axes 13 and 14 of the polarizing plate 8 are designed in this way, the directions of the polarization axes 11 and 12 of the polarizing lenses 10a and 10b are matched with the directions of the transmission and reflection of the semi-transparent mirror 9 of the target, and therefore, the conventional method. The left eye E1 can see only the image of the optotype 7a, and the right eye E2 can see only the image of the optotype 7b.
【００３０】なお、偏光板８の偏光軸１３、１４をずら
す代わりに被検者が装用する偏光メガネ１０の偏光軸１
１、１２又はビジョンテスター等の偏光軸をずらしてお
いてもよい。Incidentally, instead of shifting the polarization axes 13 and 14 of the polarizing plate 8, the polarization axis 1 of the polarizing glasses 10 worn by the subject.
The polarization axes of 1, 12, or a vision tester may be shifted.
【００３１】[0031]
【効果】本発明は、以上説明したように構成したので、
外乱光の影響を極力低減して視力検査精度の向上を図る
ことができるという効果を奏する。[Effect] Since the present invention is configured as described above,
It is possible to reduce the influence of ambient light as much as possible and improve the accuracy of the visual acuity test.
【図１】本発明に係わる視力検査装置の全体構成を示す
図である。FIG. 1 is a diagram showing an overall configuration of a visual acuity test apparatus according to the present invention.
【図２】図１に示す視標の一例を示す図である。FIG. 2 is a diagram showing an example of the optotype shown in FIG.
【図３】偏光メガネの説明図である。FIG. 3 is an explanatory diagram of polarizing glasses.
【図４】偏光板の偏光軸の説明図である。FIG. 4 is an explanatory diagram of a polarization axis of a polarizing plate.
１…筺体 ３…凹面鏡 ７…視標 ８…偏光板 ９…半透鏡 １０…偏光メガネ １０ａ、１０ｂ…偏光レンズ １１〜１４…偏光軸 DESCRIPTION OF SYMBOLS 1 ... Housing 3 ... Concave mirror 7 ... Target 8 ... Polarizing plate 9 ... Semi-transparent mirror 10 ... Polarizing glasses 10a, 10b ... Polarizing lens 11-14 ... Polarizing axis
Claims (2)
に、前記視標と前記凹面鏡との間に半透鏡を介在させ、
前記半透鏡を透過させて前記視標を前記凹面鏡に投影
し、該凹面鏡に投影された視標を前記半透鏡により反射
させて、視標の像を被検者に呈示する視力検査装置にお
いて、 前記半透鏡の反射率がその透過率よりも小さいことを特
徴とする視力検査装置。1. An optotype and a concave mirror are installed in a housing, and a semi-transparent mirror is interposed between the optotype and the concave mirror.
In the visual acuity test apparatus that transmits the semi-transparent mirror to project the target on the concave mirror, reflects the target projected on the concave mirror by the semi-transparent mirror, and presents an image of the target to a subject. A visual acuity test apparatus, wherein the semi-transparent mirror has a reflectance smaller than that of the semi-transparent mirror.
介在され、該偏光板の偏光軸と被検者が装用する偏光レ
ンズの偏光軸とが前記半透鏡の反射率値と透過率値との
差異に基づく偏光方向のずれに対応してずらされている
ことを特徴とする請求項１に記載の視力検査装置。2. A polarizing plate is interposed between the optotype and the semi-transparent mirror, and the polarization axis of the polarizing plate and the polarization axis of a polarizing lens worn by the subject are the reflectance values of the semi-transparent mirror. The visual acuity test device according to claim 1, wherein the visual acuity test device is displaced in correspondence with a deviation of a polarization direction based on a difference from a transmittance value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20400293A JP3370389B2 (en) | 1993-08-18 | 1993-08-18 | Eye test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20400293A JP3370389B2 (en) | 1993-08-18 | 1993-08-18 | Eye test |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0751228A true JPH0751228A (en) | 1995-02-28 |
| JP3370389B2 JP3370389B2 (en) | 2003-01-27 |
Family
ID=16483153
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20400293A Expired - Fee Related JP3370389B2 (en) | 1993-08-18 | 1993-08-18 | Eye test |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3370389B2 (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5672840A (en) * | 1979-08-22 | 1981-06-17 | Essilor Int | Sight inspecting apparatus |
| JPS5815128A (en) * | 1981-07-22 | 1983-01-28 | オクルス・オプテイクゲレ−テ・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング | Tester for twilight vision and light shielding sensitivity |
| JPS61196933A (en) * | 1985-02-27 | 1986-09-01 | キヤノン株式会社 | Optometer |
| JPH04295330A (en) * | 1990-12-22 | 1992-10-20 | Oculus Optikgeraete Gmbh | Testing apparatus for visual acuity |
| JPH06165756A (en) * | 1992-09-30 | 1994-06-14 | Nidek Co Ltd | Optometry apparatus |
| JPH06197867A (en) * | 1992-11-12 | 1994-07-19 | Topcon Corp | Eyesight table display device |
-
1993
- 1993-08-18 JP JP20400293A patent/JP3370389B2/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5672840A (en) * | 1979-08-22 | 1981-06-17 | Essilor Int | Sight inspecting apparatus |
| JPS5815128A (en) * | 1981-07-22 | 1983-01-28 | オクルス・オプテイクゲレ−テ・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング | Tester for twilight vision and light shielding sensitivity |
| JPS61196933A (en) * | 1985-02-27 | 1986-09-01 | キヤノン株式会社 | Optometer |
| JPH04295330A (en) * | 1990-12-22 | 1992-10-20 | Oculus Optikgeraete Gmbh | Testing apparatus for visual acuity |
| JPH06165756A (en) * | 1992-09-30 | 1994-06-14 | Nidek Co Ltd | Optometry apparatus |
| JPH06197867A (en) * | 1992-11-12 | 1994-07-19 | Topcon Corp | Eyesight table display device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3370389B2 (en) | 2003-01-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4712895A (en) | Ocular position measuring apparatus | |
| MX9403266A (en) | STEREOSCOPIC DISPLAY UNIT. | |
| US3600098A (en) | Optical alignment method and apparatus | |
| US4355871A (en) | Keratometer | |
| JPS6323639A (en) | Optical alignment apparatus | |
| US4712889A (en) | Photometer for use with a microscope | |
| US5255027A (en) | Eye testing device | |
| US20030002149A1 (en) | Range binoculars | |
| CN109725416A (en) | Eyeball tracking optical system, headset equipment and imaging method | |
| US5523836A (en) | Method and apparatus for orienting a lens' refractive characteristics and lay-out properties | |
| JP3328028B2 (en) | Head mounted video display | |
| JPS61288824A (en) | Sight apparatus of opthalmic machine | |
| US3277782A (en) | Illuminating apparatus for a microscope system using polarized light | |
| JP3370389B2 (en) | Eye test | |
| JP3556306B2 (en) | Video display device | |
| CN114073486A (en) | Polarized visual chart projector | |
| US4277150A (en) | Eye refractmeter | |
| JPH06165755A (en) | Optometry apparatus | |
| US7177080B2 (en) | Method and a device for bi-monocular image transfer | |
| JPH10314116A (en) | Index presenting device | |
| TWI772770B (en) | Image relay device and image projection system | |
| CN114532970A (en) | Watch projector for visual acuity test | |
| JP2000217783A (en) | Target presentation device | |
| JPS6310408B2 (en) | ||
| US3216123A (en) | Apparatus for indicating deviations in the relative angularity of spaced projections on a common shaft |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20071115 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20081115 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20091115 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20091115 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20101115 Year of fee payment: 8 |
|
| LAPS | Cancellation because of no payment of annual fees |