JPH082342B2 - Perimeter - Google Patents
PerimeterInfo
- Publication number
- JPH082342B2 JPH082342B2 JP61282475A JP28247586A JPH082342B2 JP H082342 B2 JPH082342 B2 JP H082342B2 JP 61282475 A JP61282475 A JP 61282475A JP 28247586 A JP28247586 A JP 28247586A JP H082342 B2 JPH082342 B2 JP H082342B2
- Authority
- JP
- Japan
- Prior art keywords
- index
- optical system
- projection
- image
- presentation position
- 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.)
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- Eye Examination Apparatus (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、半球面状の投影スクリーンの球心を含む球
心近傍部に被検眼を位置させ、その投影スクリーンに投
影される指標の指標提示箇所を変更しつつ視野測定を行
なう視野計の改良に関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention locates an eye to be examined in the vicinity of a spherical center including the spherical center of a hemispherical projection screen, and an index of an index projected on the projection screen. The present invention relates to an improvement of a perimeter that measures a visual field while changing a presentation point.
（従来の技術） 従来から、半球面状の投影スクリーンの球心を含む球
心近傍部に被検眼を位置させ、その投影スクリーンに投
影される指標の指標低位箇所を変更しつつ視野測定を行
なう視野計として各種のものが知られている。(Prior Art) Conventionally, a visual field is measured while an eye to be inspected is positioned near a ball center including a ball center of a hemispherical projection screen, and an index lower position of an index projected on the projection screen is changed. Various types of perimeters are known.
これら視野計は、精密な視野測定を行うため、指標提
示箇所の変更にかかわらず被検者が見る投影スクリーン
に投影された指標の像の大きさとその輝度とが一定とな
るべきであるという要請から種々の工夫がなされてい
る。第１のタイプでは、投影スクリーンの指標提示箇所
が存在する方向に指標投影光を反射させる回転ミラーを
設け、その投影スクリーンの指標提示箇所の変更をした
ときにその回転ミラーからその指標提示箇所までの距離
を一定に保ち、指標投影部の簡単化を図りつつその投影
スクリーン上のどの位置に指標を提示したとしてもその
像の大きさと輝度とが変わらないようにし、被検眼をそ
の球心の下方に位置させて視野測定を行なわせるように
している。Since these perimeters perform precise visual field measurement, it is required that the size of the image of the index projected on the projection screen viewed by the subject and its brightness should be constant regardless of changes in the index presentation location. Have been devised from. In the first type, a rotary mirror that reflects the index projection light in the direction in which the index presentation position of the projection screen exists is provided, and when the index presentation position of the projection screen is changed, the rotation mirror to the index presentation position Keeping the distance constant, the size and brightness of the image do not change even if the index is presented at any position on the projection screen while the index projection unit is simplified, and the eye to be inspected It is located below so that the visual field can be measured.
また、第２のタイプとして米国特許;4,561,738号で
は、回転ミラーを投影スクリーンの球心から離れた位置
に設け、被検眼を球心に位置させて視野測定を行なうよ
うにし、指標提示位置を変更したとしても指標の像のピ
ントボケが生じないようにしている。As a second type, in U.S. Pat. No. 4,561,738, a rotating mirror is provided at a position away from the center of the projection screen, the visual field is measured with the eye to be inspected at the center, and the index presentation position is changed. Even so, the out-of-focus image of the index image is prevented.
更に、第３のタイプとして米国特許;4,145,123号で
は、指標提示箇所の変更に応じて指標投影光学系を備え
た投影光学系ホルダーを全体的に移動させるようにして
いる。Further, as a third type, in U.S. Pat. No. 4,145,123, the projection optical system holder provided with the index projection optical system is moved as a whole according to the change of the index presentation position.
（発明が解決しようとする問題点） ところが、第１のタイプでは、被検眼を下方に位置さ
せて視野測定を行なうため、指標提示箇所の変更にかか
わらず投影された指標像の大きさとその輝度は略一定に
保たれるが指標の像の見かけの大きさが大きくかわり、
また、視角の変動も大きくなって、これらの投影を少な
くするためにスクリーンの半径を大きくしなければなら
ない不具合がある。(Problems to be Solved by the Invention) However, in the first type, since the visual field measurement is performed with the eye to be inspected below, the size of the projected index image and its brightness are irrespective of changes in the index presentation location. Is kept almost constant, but the apparent size of the image of the index changes greatly,
In addition, the viewing angle fluctuates greatly, and the radius of the screen must be increased in order to reduce these projections.
また、第２のタイプでは、指標提示箇所の位置の変更
に伴ってその指標提示箇所と回転ミラーとの間の距離が
変わり、投影スクリーンに投影される指標の像の倍率が
変化し、指標の像の大きさと輝度とが一定しないという
不具合がある。Further, in the second type, the distance between the index presentation location and the rotating mirror changes as the position of the index presentation location changes, the magnification of the image of the index projected on the projection screen changes, and the index There is a problem that the image size and brightness are not constant.
更に、第３のタイプでは、投影光学系ホルダーを全体
的に回転させる構成であるので指標提示箇所の変更に時
間がかかり追従性の点で問題がある。Further, in the third type, since the projection optical system holder is configured to rotate as a whole, it takes time to change the index presentation location, and there is a problem in followability.
（発明の目的） 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、投影スクリーンに投影される指標
の像の大きさとその輝度とを極力一定に保つことができ
ると共にその指標の像の見かけの大きさをも極力一定に
保って正確な視野測定を行なうことのできる構成の簡単
な視野計を提供することにある。(Object of the Invention) The present invention has been made in view of the above circumstances, and an object of the present invention is to keep the size of an image of an index projected on a projection screen and its brightness as constant as possible. Another object of the present invention is to provide a simple perimeter capable of performing accurate visual field measurement while keeping the apparent size of the image of the index as constant as possible.
（問題点を解決するための手段） 本発明に係わる請求項１に記載の視野計の特徴は、略
半球面から形成される投影スクリーンに指標提示箇所を
変更しつつ指標を提示して、被検眼の視野測定を行うも
のであって、前記投影スクリーンの球心を含む球心近傍
に被検眼を位置させる顔部固定部と、前記指標を照明す
る照明光源を有して指標光を平行光束として射出する第
１光学系と、前記指標の像が前記投影スクリーンの指標
提示箇所に投影されるように前記第１光学系からの光束
が入射されて指標投影光を前記球心を除く球心付近部を
経由させて前記投影スクリーンの指標提示箇所に導く第
２光学系と、前記指標の像が前記指標提示箇所の変更に
応じて変更後の指標提示箇所に結像するように前記第１
光学系と第２光学系との間隔を変化させる間隔変化手段
とを備えている。(Means for Solving Problems) A feature of the perimeter according to claim 1 according to the present invention is that the index is displayed on the projection screen formed of a substantially hemispherical surface while changing the index presentation position, Performing visual field measurement of the optometry, a face fixing part for positioning the eye to be examined in the vicinity of a ball center including the ball center of the projection screen, and a parallel light flux of index light having an illumination light source for illuminating the index. And a first optical system that emits light as an image, and a light flux from the first optical system is incident on the projection screen so that an image of the index is projected at a position where the index is presented on the projection screen. A second optical system that guides to the index presentation position on the projection screen via a vicinity part, and the first optical system so that an image of the index is imaged on the changed index presentation position according to the change of the index presentation position.
An interval changing unit that changes an interval between the optical system and the second optical system is provided.
本発明に係わる請求項２に記載の視野計は、前記第２
光学系は、前記第１光学系から平行光束が入射されて前
記指標投影光を出射する投影レンズと、前記球心附近部
に配置されかつ前記指標提示箇所の存在する方向に前記
投影レンズからの前記指標投影光を反射させる回転ミラ
ーとを備え、前記間隔変化手段は前記回転ミラーの回転
に基づく指標提示箇所の変更に対応して変更後の指標提
示箇所に前記指標の像が結像するように前記投影レンズ
を移動させることを特徴とする。The perimeter according to claim 2 of the present invention is the second
The optical system includes a projection lens that receives the parallel light flux from the first optical system and emits the index projection light, and a projection lens that is disposed near the spherical center and that is in the direction in which the index presentation location exists. A rotation mirror that reflects the index projection light, and the interval changing means forms an image of the index at the changed index presentation position in response to a change in the index presentation position based on rotation of the rotation mirror. And moving the projection lens.
本発明に係わる請求項３に記載の視野計は、前記間隔
変化手段は、指標提示箇所の変更に応じて変更後の指標
提示箇所までの距離の変化分に相当する距離だけ変化さ
せ、前記投影レンズと指標提示箇所までの距離を略一定
に保ちつつ、投影スクリーン上に前記指標の像が結像す
るように構成したことを特徴とする。In the perimeter according to claim 3 according to the present invention, the interval changing means changes the distance corresponding to the change in the distance to the changed index presenting position according to the change in the index presenting position, and the projection is performed. It is characterized in that the image of the index is formed on the projection screen while keeping the distance between the lens and the index presentation position substantially constant.
（作用） 本発明に係る視野計によれば、投影スクリーンの球心
を含む球心附近部に被検眼を位置させて視野測定を行な
うものであるから、投影スクリーン上での指標提示位置
を変更したとしても指標の像の見かけの大きさがほとん
ど変わらない。(Operation) According to the perimeter of the present invention, the visual field is measured by locating the eye to be examined in the vicinity of the ball center including the ball center of the projection screen. Therefore, the index presentation position on the projection screen is changed. Even if you do, the apparent size of the image of the indicator is almost unchanged.
また、第１光学系は平行光束を出射し、第２光学系は
平行光束を取り込み、指標提示位置の変更に応じてその
変更後の指標提示位置に指標の像が結像するように第１
光学系に対する第２光学系の間隔を変更するものである
から、投影スクリーンに投影された指標の像の大きさと
輝度とが指標提示位置の変更にかかわらずほとんど変化
しない。Further, the first optical system emits a parallel light flux, and the second optical system takes in the parallel light flux, and according to the change of the index presentation position, the first index system forms an image of the index at the changed index presentation position.
Since the distance between the second optical system and the optical system is changed, the size and brightness of the image of the index projected on the projection screen hardly change regardless of the change of the index presentation position.
（実施例） 以下に、本発明に係る視野計の実施例を図面を参照し
つつ説明する。(Example) Hereinafter, an example of the perimeter according to the present invention will be described with reference to the drawings.
第２図において、１は架台、２は視野計本体であり、
視野計本体２はハウジング３を備え、そのハウジング３
には略半球形状のドーム４が設けられており、そのドー
ム４の内面は投影スクリーン５となっている。そのドー
ム４の正面にはパネル６が設けられ、パネル６には顔部
受け入れ穴７が設けられ、顔部受け入れ穴７には顔部固
定用の顔面受け部材８が設けられ、９はその額当て、10
はその顎受けであり、被検眼は投影スクリーン５の球心
Ｏを含む略球心近傍部に位置されるものである。In FIG. 2, 1 is a mount, 2 is a perimeter main body,
The perimeter 2 includes a housing 3, and the housing 3
Is provided with a dome 4 having a substantially hemispherical shape, and the inner surface of the dome 4 serves as a projection screen 5. A panel 6 is provided on the front surface of the dome 4, a face receiving hole 7 is provided in the panel 6, a face receiving member 8 for fixing the face is provided in the face receiving hole 7, and 9 is a forehead thereof. Guess, 10
Is the chin rest thereof, and the eye to be inspected is located near the spherical center including the spherical center O of the projection screen 5.
ハウジング３には、第１図に示すようにドーム４の背
面側に投影光学系11が設けられている。この投影光学系
11は、照明光源12と集光レンズ13と指標14とコリメート
レンズ15と、投影レンズ16と反射ミラー17,18とからな
るものである。照明光源12と集光レンズ13と指標14とコ
リメートレンズ15とは、指標光を平行光束として出射す
る第１光学系を構成している。投影レンズ16と反射ミラ
ー17とは、後述する回転ミラー18と共に、平行光束が入
射して指標投影光を球心Ｏを除く球心附近部を経由させ
て投影スクリーン５の指標提示箇所Ｉに導く第２光学系
を構成しており、ドーム４には案内孔19が穿設されてい
る。反射ミラー17によって反射された指標投影光はその
案内孔19を通って回転ミラー18に導かれるものである。As shown in FIG. 1, the housing 3 is provided with a projection optical system 11 on the back side of the dome 4. This projection optical system
Reference numeral 11 includes an illumination light source 12, a condenser lens 13, an index 14, a collimator lens 15, a projection lens 16 and reflection mirrors 17 and 18. The illumination light source 12, the condenser lens 13, the index 14, and the collimator lens 15 form a first optical system that emits the index light as a parallel light flux. The projection lens 16 and the reflection mirror 17, together with a rotating mirror 18 described later, guides the index projection light to the index presentation point I of the projection screen 5 through a part near the sphere center except for the sphere center O when parallel light flux enters. It constitutes a second optical system, and a guide hole 19 is formed in the dome 4. The index projection light reflected by the reflection mirror 17 is guided to the rotating mirror 18 through the guide hole 19 thereof.
その回転ミラー18は球心Ｏを除く球心附近部に設けら
れている。この回転ミラー18を回転させると指標提示箇
所Ｉが変更されるものであり、18aはその回転ミラー18
の回動中心である。回転ミラー18の回動中心18aは、こ
こでは、Ｚ軸上であって球心Ｏから距離ｄだけ離れた位
置にあるとする。回転ミラー18を回転させて指標提示箇
所Ｉを変更すると、その指標提示箇所Ｉから回転ミラー
18の回転中心18aまでの距離Ｌが変化する。ここで、た
とえば、第３図〜第５図に示すように指標提示箇所をIi
〜Io〜Ijのように変化させると、回転ミラー18の回転中
心18aから指標提示箇所Ii、Io、Ijまでの距離Li、Lo、L
jがその指標提示箇所Ｉの変更に対応して変化すること
になる。そこで、この回転ミラー18の回転中心18aから
指標提示位置Ｉまでの距離Ｌの変化を補正するために、
距離Ｌの変化分に相当する距離だけ投影レンズ16が光軸
方向に間隔変更手段によって移動されるものとなってお
り、この投影レンズ16の移動によって、指標提示位置Ｉ
の変更にかかわらず大きさと輝度とがほとんど変わらな
い指標の像が投影スクリーン５に結像するものである。
第６図はその指標提示箇所Iiに指標の像を結像させると
きの投影レンズ16の位置を基準として指標提示箇所Io、
Ijに指標の像を結像させたときの投影レンズ16の移動位
置を示している。The rotating mirror 18 is provided near the ball center except the ball center O. When the rotary mirror 18 is rotated, the index presentation point I is changed, and 18a is the rotary mirror 18
Is the center of rotation. Here, the rotation center 18a of the rotating mirror 18 is assumed to be located on the Z axis and at a distance d from the center O of the ball. When the rotary mirror 18 is rotated to change the index presentation point I, the rotary mirror is rotated from the index presentation point I.
The distance L to the rotation center 18a of 18 changes. Here, for example, the index presenting position, as shown in Figure 3-Figure 5 I i
~I o When alters as ~I j, index presenting position I i from the rotation center 18a of the rotating mirror 18, I o, the distance L i up to I j, L o, L
j changes according to the change of the index presentation part I. Therefore, in order to correct the change in the distance L from the rotation center 18a of the rotating mirror 18 to the index presentation position I,
The projection lens 16 is moved in the optical axis direction by the distance changing means by a distance corresponding to the change in the distance L. By the movement of the projection lens 16, the index presentation position I
The image of the index whose size and brightness hardly change regardless of the change of is formed on the projection screen 5.
FIG. 6 shows the index presentation position I o with reference to the position of the projection lens 16 when the image of the index is formed on the index presentation position I i ,
The movement position of the projection lens 16 when the image of the index is formed on I j is shown.
ある指標提示箇所に指標を投影するためのミラーの回
転角度は次のように表わせる。The rotation angle of the mirror for projecting the index on a certain index presentation position can be expressed as follows.
一般に、第１図に示すように指標の像を形成すべき箇
所Ｉ（xI，yI，zI）は、 xI＝r sinθ・cosφ yI＝r sinθ・sinφ ZI＝r cosθ という式を用いて表される。Generally, as shown in FIG. 1, a portion I (x I , y I , z I ) where an image of an index is to be formed is x I = r sin θ · cos φ y I = r sin θ · sin φ Z I = r cos θ It is expressed using a formula.
ただし、θは球心Ｏと指標提示位置Ｉ（xI，yI，zI）
を結ぶ線分IOとＺ軸とのなす角度、φはXY平面上での指
標Ｉ′（xI，yI）と球心Ｏとを結ぶ線分Ｉ′ＯとＸ軸と
がなす角度、ｒは線分IOの長さ、またαは回転ミラー18
における入反射角である。However, θ is the ball center O and the index presentation position I (x I , y I , z I )
The angle formed by the line segment IO connecting Z and the Z axis, φ is the angle formed by the line segment I'O connecting the index I '(x I , y I ) and the ball center O on the XY plane, and the X axis, r is the length of the line segment IO, and α is the rotating mirror 18
Is the angle of incidence and reflection at.
また、第７図に示すようにドーム４の案内孔19の位置
Ｅ（xE，yE，zE）は、 xE＝Ｏ yE＝r sinΘ zE＝r cosΘ−ｄ ただし、ΘはYZ平面内での球心Ｏと案内孔19とを結ぶ
線分OEとＺ軸とのなす角度、ｄは球心Ｏから回転ミラー
18の回転中心18aまでの距離である。なお、案内孔19は
Ｚ軸とＹ軸とを含む平面内に形成されているとした。As shown in FIG. 7, the position E (x E , y E , z E ) of the guide hole 19 of the dome 4 is x E = O y E = r sin Θ z E = r cos Θ-d where Θ is An angle formed by the line segment OE connecting the ball center O and the guide hole 19 in the YZ plane and the Z axis, d is the ball center O and the rotating mirror
It is the distance to the center of rotation 18a of 18. The guide hole 19 is formed in a plane including the Z axis and the Y axis.
ここで、案内孔19を通過した指標投影光を指標提示箇
所Ｉに向かわせるとき、回転ミラー18の法線ベクトル
の回転量をＺ軸となす回転角度θ′とXY平面内での回転
角度φ′とを用いて表すとすると、回転ミラー18の法線
ベクトル（nx,ny,nz）;|｜＝１は、nx＝sinθ′・c
osφ′ny＝sinθ′・sinφ′、nz＝cosθ′であり、 θ′＝cos-1（nz） である。ただし、 である。Here, when the index projection light that has passed through the guide hole 19 is directed to the index presentation location I, a rotation angle θ ′ that forms the rotation amount of the normal vector of the rotating mirror 18 with the Z axis and a rotation angle φ in the XY plane. ′ And, the normal vector (nx, ny, nz); || = 1 of the rotating mirror 18 is nx = sin θ ′ · c
osφ'ny = sinθ '・ sinφ', nz = cosθ ', and θ' = cos -1 (nz) Is. However, Is.
したがって、たとえば、ｒ＝330mm、ｄ＝80mm、Θ＝5
0°として、指標投影範囲をθ＝30°からθ＝170°まで
を投影により行なう場合と投影レンズ16の最大移動量
は、ミラー18と指標提示箇所Ｉまでの距離が で表わされることから約145mmとなる。Therefore, for example, r = 330 mm, d = 80 mm, Θ = 5
When the index projection range is θ = 30 ° to θ = 170 ° and the maximum movement amount of the projection lens 16 is 0 °, the distance between the mirror 18 and the index presentation point I is Since it is represented by, it will be about 145 mm.
このものでは、指標提示装置Ｉの変更に応じてその変
更後の指標提示位置Ｉに指標の像が結像するように第１
光学系と第２光学系との間隔を変更するものであるか
ら、投影スクリーン５に投影された指標の像の大きさと
輝度とが指標提示位置Ｉの変更にかかわらずほとんど変
化しない。また、投影スクリーン５の球心Ｏを含む略球
心近傍部に被検眼を位置させて視野測定を行なうもので
あるから、投影スクリーン５上での指標提示位置Ｉを変
更したとしても指標の像の見かけの大きさがほとんど変
わらない。In this configuration, when the index presentation device I is changed, the first image is formed on the index presentation position I after the change.
Since the distance between the optical system and the second optical system is changed, the size and brightness of the image of the index projected on the projection screen 5 hardly change regardless of the change of the index presentation position I. Further, since the visual field is measured by locating the eye to be examined in the vicinity of the spherical center including the spherical center O of the projection screen 5, even if the index presentation position I on the projection screen 5 is changed, the image of the index is changed. The apparent size of is almost unchanged.
（発明の効果） 本発明に係る視野計は、以上説明したように構成した
ので、簡単な構成で、投影スクリーンに投影される指標
の像の大きさとその輝度とを極力一定に保つことができ
ると共にその指標の像の見かけの大きさをも極力一定に
保って正確な視野測定を行なうことができるという効果
を奏する。(Effects of the Invention) Since the perimeter according to the present invention is configured as described above, it is possible to keep the size of the image of the index projected on the projection screen and its brightness as constant as possible with a simple configuration. At the same time, it is possible to keep the apparent size of the image of the index as constant as possible and perform accurate visual field measurement.
第１図は本発明に係る視野計の要部構成を示す模式図、
第２図はその視野計の外観構成の一例を示す斜視図、第
３図〜第５図はその視野計のによる指標提示位置を模式
的に示した図、第６図は第３図〜第５図の指標提示位置
と光学系のレンズの移動位置との関係を示す図、第７図
は回転ミラーの法線ベクトルの回転量と指標提示位置と
の関係を説明するために用いた説明図である。 ５……投影スクリーン、11……指標投影光学系 12……照明光源、14……指標 15……コリメートレンズ（第１光学系） 16……投影レンズ（第２光学系） 18……回転ミラー、Ｉ……指標提示箇所 Ｏ……球心FIG. 1 is a schematic view showing the main configuration of a perimeter according to the present invention,
FIG. 2 is a perspective view showing an example of the external configuration of the perimeter, FIGS. 3 to 5 are diagrams schematically showing the index presentation position by the perimeter, and FIG. FIG. 5 is a diagram showing the relationship between the index presentation position and the movement position of the lens of the optical system in FIG. 5, and FIG. 7 is an explanatory diagram used for explaining the relationship between the rotation amount of the normal vector of the rotating mirror and the index presentation position. Is. 5 ... Projection screen, 11 ... Index projection optical system 12 ... Illumination light source, 14 ... Index 15 ... Collimating lens (first optical system) 16 ... Projection lens (second optical system) 18 ... Rotating mirror , I ... Indicator presentation point O ... Ball center
Claims (3)
指標提示箇所を変更しつつ指標を提示して、被検眼の視
野測定を行う視野計において、 前記投影スクリーンの球心を含む球心近傍に被検眼を位
置させる顔部固定部と、前記指標を照明する照明光源を
有して指標光を平行光束として射出する第１光学系と、 前記指標の像が前記投影スクリーンの指標提示箇所に投
影されるように前記第１光学系からの光束が入射されて
指標投影光を前記球心を除く球心付近部を経由させて前
記投影スクリーンの指標提示箇所に導く第２光学系と、
前記指標の像が前記指標提示箇所の変更に応じて変更後
の指標提示箇所に結像するように前記第１光学系と第２
光学系との間隔を変化させる間隔変化手段とを備えてい
ることを特徴とする視野計。1. A perimeter that measures a visual field of an eye by presenting an index on a projection screen formed of a substantially hemispherical surface while changing the index presentation position, and in the vicinity of a ball center including a ball center of the projection screen. A face fixing part for positioning the eye to be examined, a first optical system having an illumination light source for illuminating the index and emitting index light as a parallel light flux, and an image of the index at an index presentation position on the projection screen. A second optical system, into which the light flux from the first optical system is incident so as to be projected, and guides the index projection light to the index presenting portion of the projection screen via a portion near the sphere center other than the sphere center,
The first optical system and the second optical system so that the image of the index is formed on the changed index presentation position in accordance with the change of the index presentation position.
A perimeter which is provided with a space changing means for changing a space between the optical system and the optical system.
行光束が入射されて前記指標投影光を出射する投影レン
ズと、前記球心附近部に配置されかつ前記指標提示箇所
の存在する方向に前記投影レンズからの前記指標投影光
を反射させる回転ミラーとを備え、前記間隔変化手段は
前記回転ミラーの回転に基づく指標提示箇所の変更に対
応して変更後の指標提示箇所に前記指標の像が結像する
ように前記投影レンズを移動させることを特徴とする特
許請求の範囲第１項に記載の視野計。2. The second optical system includes a projection lens for emitting a parallel light flux from the first optical system and emitting the index projection light, and a projection lens disposed near the spherical center and having the index presentation position. And a rotation mirror that reflects the index projection light from the projection lens in a direction in which the distance change means corresponds to a change in the index presentation position based on rotation of the rotation mirror, The perimeter according to claim 1, wherein the projection lens is moved so that an image of an index is formed.
に応じて変更後の指標提示箇所までの距離の変化分に相
当する距離だけ変化させ、前記投影レンズと指標提示箇
所までの距離を略一定に保ちつつ、投影スクリーン上に
前記指標の像が結像するように構成したことを特徴とす
る特許請求の範囲第２項に記載の視野計。3. The distance changing means changes the distance between the projection lens and the index presenting point by changing the distance corresponding to the change in the distance to the changed index presenting point according to the change of the index presenting point. The perimeter according to claim 2, characterized in that the index image is formed on the projection screen while being kept substantially constant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61282475A JPH082342B2 (en) | 1986-11-27 | 1986-11-27 | Perimeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61282475A JPH082342B2 (en) | 1986-11-27 | 1986-11-27 | Perimeter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63135124A JPS63135124A (en) | 1988-06-07 |
| JPH082342B2 true JPH082342B2 (en) | 1996-01-17 |
Family
ID=17652915
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61282475A Expired - Fee Related JPH082342B2 (en) | 1986-11-27 | 1986-11-27 | Perimeter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH082342B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0211118A (en) * | 1988-06-29 | 1990-01-16 | Kowa Co | Perimeter |
| US20230143549A1 (en) * | 2020-03-31 | 2023-05-11 | Nidek Co., Ltd | Optometry system and non-transitory computer-readable storage medium |
| JP7543681B2 (en) * | 2020-03-31 | 2024-09-03 | 株式会社ニデック | Optometry Systems and Programs |
| EP4465870A1 (en) * | 2022-03-29 | 2024-11-27 | Haag-Streit Ag | Perimeter with adjustable lens |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5438044B2 (en) * | 1971-09-09 | 1979-11-19 |
-
1986
- 1986-11-27 JP JP61282475A patent/JPH082342B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63135124A (en) | 1988-06-07 |
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|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |