JP3015038B2 - Corneal shape measuring device - Google Patents
Corneal shape measuring deviceInfo
- Publication number
- JP3015038B2 JP3015038B2 JP1090966A JP9096689A JP3015038B2 JP 3015038 B2 JP3015038 B2 JP 3015038B2 JP 1090966 A JP1090966 A JP 1090966A JP 9096689 A JP9096689 A JP 9096689A JP 3015038 B2 JP3015038 B2 JP 3015038B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- corneal shape
- light source
- ring
- shaped
- 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.)
- Expired - Fee Related
Links
Landscapes
- 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、眼科医院等で被検眼の角膜形状測定に使用
する角膜形状測定装置に関するものである。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a corneal shape measuring device used for measuring a corneal shape of an eye to be examined in an ophthalmic clinic or the like.
［従来の技術］ 従来から使用されている角膜形状測定装置は、指標を
角膜に投影して角膜形状の測定を行っているが、通常で
はリング状の光源を用いている。[Related Art] Conventionally used corneal shape measuring devices measure a corneal shape by projecting an index onto the cornea, but usually use a ring-shaped light source.
［発明が解決しようとする課題］ しかしながら、このリング状の光源は、照明系の構造
が複雑でかつ大型なものになってしまう問題点がある。[Problems to be Solved by the Invention] However, this ring-shaped light source has a problem that the structure of the illumination system is complicated and large.
本発明の目的は、上述の従来例の問題を解消し、照明
系の構造が簡単で小型化が可能な角膜形状測定装置を提
供することにある。An object of the present invention is to provide a corneal shape measuring apparatus which solves the above-described problems of the conventional example and has a simple illumination system structure and can be miniaturized.
［課題を解決するための手段］ 上記の目的を達成するための本発明に係る角膜形状測
定装置は、共通のプリント基板に取り付けた多数のLED
光源により構成した光源部を光拡散部材の直後に配置す
ると共に、前記光拡散部材の前方にリング状の透孔を有
する遮光部材を配置し、前記光源部により前記光拡散部
材を介して前記遮光部材を照明することによって被検眼
にリング状の指標を投影し、その角膜反射像を二次元光
検出素子で受像して角膜形状測定を行うことを特徴とす
る。[Means for Solving the Problems] To achieve the above object, a corneal shape measuring apparatus according to the present invention comprises a large number of LEDs mounted on a common printed circuit board.
A light source unit constituted by a light source is arranged immediately after the light diffusing member, and a light shielding member having a ring-shaped through hole is arranged in front of the light diffusing member, and the light source unit intercepts the light through the light diffusing member. By illuminating the member, a ring-shaped index is projected on the eye to be inspected, and a corneal reflection image is received by a two-dimensional photodetector to perform corneal shape measurement.
［作用］ 上記の構成を有する角膜形状測定装置は、照明系の構
造が簡単で小型にできる。[Operation] The corneal shape measuring apparatus having the above-described configuration has a simple structure of the illumination system and can be made compact.
［実施例］ 本発明を図示の実施例に基づいて詳細に説明する。[Example] The present invention will be described in detail based on an illustrated example.
ここで、実施例の説明に先立ち参考例として第１図〜
第３図を説明する。第１図は参考例の構成図を示し、被
検眼Ｅの前方には光透過部を拡散面とした例えば合成樹
脂から成る拡散板１が設けられ、この拡散板１には第２
図に示すように光軸Ｏを中心とする円形透過部1aが設け
られ、その周囲にリング状透過部1bが設けられ、更にそ
の周囲には等角度に４個の点状透過部1cが配置されてい
る。Here, prior to the description of the embodiment, FIG.
Referring to FIG. FIG. 1 shows a configuration diagram of a reference example. A diffusion plate 1 made of, for example, synthetic resin having a light transmitting portion as a diffusion surface is provided in front of an eye E to be inspected.
As shown in the figure, a circular transmitting portion 1a centered on the optical axis O is provided, a ring-shaped transmitting portion 1b is provided around the circular transmitting portion 1a, and four point-like transmitting portions 1c are arranged around the same at an equal angle. Have been.
また、拡散板１の後方の光軸Ｏ上には、結像レンズ
２、絞り３、CCD等から成る二次元光検出素子４が配列
されている。なお、ここで絞り３は結像レンズ２の焦点
位置Ｆよりも後方に配置されている。更に、拡散板１の
リング状透過部1bの直後には複数個の観察光源５が配置
され、点状透過部1cの直後にはそれぞれ測定光源６が設
けられている。On the optical axis O behind the diffusion plate 1, a two-dimensional photodetector 4 composed of an imaging lens 2, a stop 3, a CCD, and the like is arranged. Here, the diaphragm 3 is disposed behind the focal position F of the imaging lens 2. Further, a plurality of observation light sources 5 are arranged immediately after the ring-shaped transmission portion 1b of the diffusion plate 1, and measurement light sources 6 are respectively provided immediately after the point-shaped transmission portions 1c.
測定光源６と観察光源５は、拡散板１の測定指標Ｐと
なる点状透過部1cと観察指標Ｒとなるリング状透過部1b
をそれぞれ照明し、被検眼Ｅの角膜Ec上に測定指標像
Ｐ′と観察指標像Ｒ′を投影する。これらの指標Ｐ′、
Ｒ′は、結像レンズ２、絞り３を経て、第３図に示すよ
うに二次元光検出素子４上に結像される。この測定指標
像Ｐ′の二次元光検出素子４上の位置から、角膜形状の
測定をすることができる。The measurement light source 6 and the observation light source 5 include a point-shaped transmission portion 1c serving as a measurement index P of the diffusion plate 1 and a ring-shaped transmission portion 1b serving as an observation index R.
Are respectively illuminated, and a measurement target image P ′ and an observation target image R ′ are projected on the cornea Ec of the eye E. These indices P ',
R 'passes through the imaging lens 2 and the aperture 3 and forms an image on the two-dimensional photodetector 4 as shown in FIG. The corneal shape can be measured from the position of the measurement target image P 'on the two-dimensional photodetector 4.
一般には、二次元光検出素子４のビデオ信号の限定領
域から取り込む二値信号から、二次元光検出素子４上の
像の重心を計算して、角膜形状の測定をする。限定領域
に比べて得られた結合像が、或る程度以上に大きくない
と精度が低下するので、測定指標Ｐは一定以上の大きさ
にする必要があり、また角膜形状を直観的に把握するた
めに、観察指標Ｒはリング形状が好ましい。なお、絞り
３は結像レンズ２の焦点位置Ｆよりも後方に設けられて
いるので、例えば特開昭61−249432号公報に記載されて
いるように、被検眼Ｅと測定光源６との作動距離が変化
しても測定誤差が小さくて済む。In general, the corneal shape is measured by calculating the center of gravity of the image on the two-dimensional photodetector 4 from a binary signal captured from the limited area of the video signal of the two-dimensional photodetector 4. If the combined image obtained as compared with the limited area is not larger than a certain degree, the accuracy is reduced. Therefore, the measurement index P needs to be a certain size or more, and the corneal shape is intuitively grasped. Therefore, the observation index R preferably has a ring shape. Since the stop 3 is provided behind the focal position F of the imaging lens 2, the operation between the eye E and the measurement light source 6 is performed, for example, as described in JP-A-61-249432. Even if the distance changes, the measurement error can be small.
角膜形状の観察時には、角膜Ecにリング状の測定指標
Ｒを投影し、測定時には測定指標Ｐのみを投影するの
で、測定光源６が観察指標Ｒを照射しないように、測定
光源６と観察光源５の間には遮光板７を設け、拡散板１
に溝８を設けて光束が拡散板１内を伝播しないようにす
ることが好適である。When observing the corneal shape, the ring-shaped measurement index R is projected onto the cornea Ec, and only the measurement index P is projected during the measurement. A light-shielding plate 7 is provided between the
It is preferable that a groove 8 is provided in the light emitting element to prevent the light beam from propagating in the diffusion plate 1.
第４図は実施例の構成図であり、第１図と同じ符号は
同じ部材を示している。拡散板９には第５図に示すよう
な多数のリング形状指標から成る透過部9aが設けられ、
その直後にプリント基板10上に取り付けられた多数個の
LEDから成る光源11が配置されている。FIG. 4 is a block diagram of the embodiment, and the same reference numerals as those in FIG. 1 indicate the same members. The diffusion plate 9 is provided with a transmission portion 9a composed of a number of ring-shaped indices as shown in FIG.
Immediately afterwards, a large number of
A light source 11 composed of an LED is arranged.
拡散板９の前部にはリング形状指標は光源11で照射さ
れて角膜Ec上に投影される。受光系は第１図の場合と同
様に、このリング状指標の二次元光検出素子４上で得ら
れる角膜反射像から角膜の観察と形状測定をすることが
できる。The front of the diffuser 9 is irradiated with the ring-shaped index by the light source 11 and projected on the cornea Ec. As in the case of FIG. 1, the light receiving system can observe and measure the shape of the cornea from the corneal reflection image obtained on the two-dimensional light detecting element 4 of the ring-shaped index.
なお、指標を構成する拡散板は、透孔を設けた金属な
どの遮光板の後方に光拡散性を有する部材を設けるよう
にしてもよい。The diffusion plate constituting the index may be provided with a light diffusing member behind a light-shielding plate such as a metal provided with a through hole.
［発明の効果］ 以上説明したように本発明に係る角膜形状測定装置
は、次のような利点を有する。[Effects of the Invention] As described above, the corneal shape measuring apparatus according to the present invention has the following advantages.
（１）角膜形状測定に適したリング指標を光軸方向のス
ペースを取らずに、しかも簡易な構成で実現できる。(1) A ring index suitable for corneal shape measurement can be realized with a simple configuration without taking up space in the optical axis direction.
（２）多数のLED光源により光拡散部材を介して照明す
ることにより均一なリング指標ができる。(2) A uniform ring index can be obtained by illuminating a large number of LED light sources via a light diffusing member.
（３）軸方向スペースを取らないために、オートレフラ
クトメータなどの光学系との複合化が可能となる。(3) Since it does not take up space in the axial direction, it can be combined with an optical system such as an auto-refractometer.
図面第１図は参考例の構成図、第２図は参考例の拡散板
の正面図、第３図は参考例の二次元光検出素子への投影
像の説明図、第４図は実施例の構成図、第５図はその拡
散板の正面図である。 符号１、９は拡散板、２は結像レンズ、３は絞り、４は
二次元光検出素子、５は観察光源、６は測定光源、10は
プリント基板、11は光源である。FIG. 1 is a structural view of a reference example, FIG. 2 is a front view of a diffusion plate of the reference example, FIG. 3 is an explanatory view of a projected image onto a two-dimensional photodetector of the reference example, and FIG. FIG. 5 is a front view of the diffusion plate. Reference numerals 1 and 9 denote diffusion plates, 2 denotes an imaging lens, 3 denotes an aperture, 4 denotes a two-dimensional photodetector, 5 denotes an observation light source, 6 denotes a measurement light source, 10 denotes a printed circuit board, and 11 denotes a light source.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) A61B 3/00 - 3/18 ──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. 7 , DB name) A61B 3/00-3/18
Claims (1)
D光源により構成した光源部を光拡散部材の直後に配置
すると共に、前記光拡散部材の前方にリング状の透孔を
有する遮光部材を配置し、前記光源部により前記光拡散
部材を介して前記遮光部材を照明することによって被検
眼にリング状の指標を投影し、その角膜反射像を二次元
光検出素子で受像して角膜形状測定を行うことを特徴と
する角膜形状測定装置。1. A large number of LEs mounted on a common printed circuit board
A light source unit constituted by a D light source is disposed immediately after the light diffusing member, and a light shielding member having a ring-shaped through hole is disposed in front of the light diffusing member, and the light source unit passes through the light diffusing member. A corneal shape measuring apparatus, wherein a ring-shaped index is projected on an eye to be examined by illuminating a light-shielding member, and a corneal reflection image is received by a two-dimensional photodetector to measure a corneal shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1090966A JP3015038B2 (en) | 1989-04-10 | 1989-04-10 | Corneal shape measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1090966A JP3015038B2 (en) | 1989-04-10 | 1989-04-10 | Corneal shape measuring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02268731A JPH02268731A (en) | 1990-11-02 |
| JP3015038B2 true JP3015038B2 (en) | 2000-02-28 |
Family
ID=14013241
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1090966A Expired - Fee Related JP3015038B2 (en) | 1989-04-10 | 1989-04-10 | Corneal shape measuring device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3015038B2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4779973A (en) * | 1986-11-06 | 1988-10-25 | David Miller | Photokeratometric device |
-
1989
- 1989-04-10 JP JP1090966A patent/JP3015038B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02268731A (en) | 1990-11-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |