JPH0430857B2 - - Google Patents
Info
- Publication number
- JPH0430857B2 JPH0430857B2 JP60264159A JP26415985A JPH0430857B2 JP H0430857 B2 JPH0430857 B2 JP H0430857B2 JP 60264159 A JP60264159 A JP 60264159A JP 26415985 A JP26415985 A JP 26415985A JP H0430857 B2 JPH0430857 B2 JP H0430857B2
- Authority
- JP
- Japan
- Prior art keywords
- cornea
- tonometer
- deformation
- airflow
- intraocular pressure
- 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 - Lifetime
Links
- 210000004087 cornea Anatomy 0.000 claims description 28
- 230000004410 intraocular pressure Effects 0.000 claims description 10
- 230000003287 optical effect Effects 0.000 claims description 10
- 230000004907 flux Effects 0.000 claims description 5
- 238000006073 displacement reaction Methods 0.000 claims description 4
- 238000007664 blowing Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 description 7
- 210000001508 eye Anatomy 0.000 description 5
- 238000003384 imaging method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 210000005252 bulbus oculi Anatomy 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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、眼科医院等で使用され、空気流によ
る角膜の変形を利用した眼圧計に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a tonometer used in eye clinics and the like, which utilizes the deformation of the cornea caused by air flow.
従来から一般に用いられている眼圧計として
は、空気圧を眼球に作用させ角膜を圧平して眼圧
を測定する所謂NCT（Non Contact
Tonometer）が良く知られている。この眼圧計
は第２図に示すように、ノズル１から角膜Ecに
空気流Ａを噴出し角膜Ecを圧平する。この過程
で、光源２から凸レンズ３を介して平行光を角膜
Ecに照射し、対物レンズ４、光電検出器５によ
る受光光学系によつて、角膜Ecの圧平状態を検
知するようになつている。しかし、この眼圧計は
空気圧が強いために被検者に不快感を与える欠点
がある。
Tonometers that have been commonly used include the so-called NCT (Non Contact), which measures intraocular pressure by applying air pressure to the eyeball and applanating the cornea.
Tonometer) is well known. As shown in FIG. 2, this tonometer ejects an air flow A from a nozzle 1 toward the cornea Ec to applanate the cornea Ec. In this process, parallel light is transmitted from the light source 2 to the cornea through the convex lens 3.
Ec is irradiated, and the applanation state of the cornea Ec is detected by a light receiving optical system including an objective lens 4 and a photoelectric detector 5. However, this tonometer has the disadvantage of causing discomfort to the subject due to the strong air pressure.
本発明の目的は、上述の欠点を解消し、弱い空
気圧により角膜に僅かな変形を与えてその変形量
を光学的手段で求め、これにより被検者に不快感
を与えずに眼圧を精度良く測定し得る眼圧計を提
供することにある。
The purpose of the present invention is to eliminate the above-mentioned drawbacks, to provide a slight deformation to the cornea using weak air pressure, and to determine the amount of deformation by optical means, thereby accurately measuring intraocular pressure without causing discomfort to the subject. The object of the present invention is to provide a tonometer that can perform measurements well.
上述の目的を達成するための本発明の要旨は、
気流を角膜に吹き付け角膜を変形させ、その変形
を光電的に検知して眼圧を求める眼圧計におい
て、気流方向に傾斜した方向から光束を角膜に投
影する投影光学系と、光束位置を検出できる光電
センサに前記光束の角膜反射光を受光する受光系
とを有し、気流を作用した時の角膜反射光束の前
記光電センサ上の光束位置の変位を検知して眼圧
を求めることを特徴とする眼圧計である。
The gist of the present invention to achieve the above object is as follows:
A tonometer that deforms the cornea by blowing airflow onto the cornea and measures the intraocular pressure by photoelectrically detecting the deformation, has a projection optical system that projects a light beam onto the cornea from a direction tilted to the direction of the airflow, and can detect the position of the light beam. The photoelectric sensor has a light receiving system that receives the corneal reflected light of the luminous flux, and the intraocular pressure is determined by detecting the displacement of the position of the corneal reflected luminous flux on the photoelectric sensor when an airflow is applied. This is a tonometer.
本発明を図示の実施例に基づいて詳細に説明す
る。
The present invention will be explained in detail based on illustrated embodiments.
第１図において、Ｅは被検眼であり、その前方
には空気流Ａを吹き出すノズル１０が配置されて
いる。そして、被検眼Ｅの斜め前方には点光源１
１が配置され、被検眼Ｅとの間に集光レンズ１２
が設けられている。点光源１１からの光束Ｌ１の
角膜Ecにおける反射光Ｌ２の方向に、結像レン
ズ１３、光位置検出素子１４が配置されており、
この検出素子１４は点光源１１、及び角膜Ecと
略共役になつている。光源１１からの光束Ｌ１を
入射する角膜Ecの位置は、空気流Ａの中心つま
り角膜Ecの頂点とすることが、検出する変位量
が最大となるので好適である。 In FIG. 1, E is the eye to be examined, and a nozzle 10 that blows out an air flow A is arranged in front of the eye. A point light source 1 is diagonally in front of the eye E to be examined.
1 is arranged, and a condensing lens 12 is placed between it and the eye E to be examined.
is provided. An imaging lens 13 and an optical position detection element 14 are arranged in the direction of the reflected light L2 of the light beam L1 from the point light source 11 on the cornea Ec,
This detection element 14 is substantially conjugate with the point light source 11 and the cornea Ec. The position of the cornea Ec on which the light beam L1 from the light source 11 is incident is preferably set at the center of the air flow A, that is, the vertex of the cornea Ec, since this maximizes the amount of displacement to be detected.
光源１１から出射した光束Ｌ１は集光レンズ１
２により、角膜Ec上の点Ｐに空気流Ａに対して
斜め方向から集束されて入射し角膜Ecで反射さ
れる。角膜Ecで反射された光束Ｌ２は、結像レ
ンズ１３を介して光位置検出素子１４上の点Ｑに
入射する。ここで、角膜Ecにノズル１０から矢
印方向に空気流Ａを作用させると、点線で示すよ
うに角膜Ecが変形し、角膜Ec上の反射点はＰか
らP′に移動する。このとき、光位置検出素子１４
上の光束もＱからQ′に移動し、その変位量から
角膜Ecの変形量を求めることができる。 The luminous flux L1 emitted from the light source 11 passes through the condensing lens 1
2, the air is focused and incident on a point P on the cornea Ec from an oblique direction with respect to the airflow A, and is reflected by the cornea Ec. The light beam L2 reflected by the cornea Ec enters a point Q on the optical position detection element 14 via the imaging lens 13. Here, when the air flow A is applied to the cornea Ec from the nozzle 10 in the direction of the arrow, the cornea Ec is deformed as shown by the dotted line, and the reflection point on the cornea Ec moves from P to P'. At this time, the optical position detection element 14
The upper light beam also moves from Q to Q', and the amount of deformation of the cornea Ec can be determined from the amount of displacement.
角膜Ecの変形量は眼圧と関係しており、予め
この関係を求めておけば、変形量を知つて眼圧を
求めることができる。角膜Ec上の光束Ｌ１の入
射スポツトは集光レンズ１２で集光して、径を小
さくした方が角膜曲率の影響を受けないので好ま
しい。 The amount of deformation of the cornea Ec is related to the intraocular pressure, and if this relationship is determined in advance, the intraocular pressure can be determined by knowing the amount of deformation. It is preferable that the incident spot of the light beam L1 on the cornea Ec be condensed by the condensing lens 12 to have a small diameter because it will not be affected by the corneal curvature.
この場合に、空気圧を変化させながら所定の角
膜変形量を与える空気圧によつて眼圧を求めても
よいし、一定圧を与えたときの変形量を測定して
もよい。光位置検出素子１４はCCD（電荷結合素
子）のようなアレイセンサでもよいし、アナログ
量を出力する半導体位置検出素子でも支障はな
い。 In this case, the intraocular pressure may be determined by the air pressure that provides a predetermined amount of corneal deformation while changing the air pressure, or the amount of deformation when a constant pressure is applied may be measured. The optical position detection element 14 may be an array sensor such as a CCD (charge coupled device), or may be a semiconductor position detection element that outputs an analog quantity.
以上説明したように本発明に係る眼圧計は、従
来のように圧平するよりも遥かに弱い空気圧によ
る角膜の変形でも、その変形量を精度良く測定で
きるので、被検者に不快感を与えることなく眼圧
を測定できることになる。
As explained above, the tonometer according to the present invention can accurately measure the amount of deformation of the cornea even when the cornea is deformed by air pressure, which is much weaker than when applanation is used in the past. This means that intraocular pressure can be measured without
図面第１図は本発明に係る眼圧計の実施例の構
成図であり、第２図は従来の光学系の構成図であ
る。
符号１０はノズル、１１は点光源、１２は集光
レンズ、１３は結像レンズ、１４は光位置検出素
子である。
FIG. 1 is a block diagram of an embodiment of a tonometer according to the present invention, and FIG. 2 is a block diagram of a conventional optical system. 10 is a nozzle, 11 is a point light source, 12 is a condensing lens, 13 is an imaging lens, and 14 is an optical position detection element.
Claims (1)
変形を光電的に検知して眼圧を求める眼圧計にお
いて、気流方向に傾斜した方向から光束を角膜に
投影する投影光学系と、光束位置を検出できる光
電センサに前記光束の角膜反射光を受光する受光
系とを有し、気流を作用した時の角膜反射光束の
前記光電センサ上の光束位置の変位を検知して眼
圧を求めることを特徴とする眼圧計。1 A tonometer that deforms the cornea by blowing airflow onto the cornea and measures the intraocular pressure by photoelectrically detecting the deformation, uses a projection optical system that projects a light beam onto the cornea from a direction inclined to the direction of the airflow, and detects the position of the light beam. The method is characterized in that the photoelectric sensor has a light receiving system that receives the corneal reflected light of the luminous flux, and the intraocular pressure is determined by detecting the displacement of the position of the corneal reflected luminous flux on the photoelectric sensor when airflow is applied. Tonometer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60264159A JPS62122631A (en) | 1985-11-25 | 1985-11-25 | tonometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60264159A JPS62122631A (en) | 1985-11-25 | 1985-11-25 | tonometer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62122631A JPS62122631A (en) | 1987-06-03 |
| JPH0430857B2 true JPH0430857B2 (en) | 1992-05-22 |
Family
ID=17399281
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60264159A Granted JPS62122631A (en) | 1985-11-25 | 1985-11-25 | tonometer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62122631A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5255235B2 (en) | 2007-06-11 | 2013-08-07 | ユニ・チャーム株式会社 | tampon |
-
1985
- 1985-11-25 JP JP60264159A patent/JPS62122631A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62122631A (en) | 1987-06-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |