JPH05154112A - Ophthalmologic device - Google Patents

Ophthalmologic device

Info

Publication number
JPH05154112A
JPH05154112A JP3342183A JP34218391A JPH05154112A JP H05154112 A JPH05154112 A JP H05154112A JP 3342183 A JP3342183 A JP 3342183A JP 34218391 A JP34218391 A JP 34218391A JP H05154112 A JPH05154112 A JP H05154112A
Authority
JP
Japan
Prior art keywords
light source
light
optical system
corneal reflection
reflection image
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
Application number
JP3342183A
Other languages
Japanese (ja)
Other versions
JP3154533B2 (en
Inventor
Kouki Katou
功騎 加藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nidek Co Ltd
Original Assignee
Nidek Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nidek Co Ltd filed Critical Nidek Co Ltd
Priority to JP34218391A priority Critical patent/JP3154533B2/en
Publication of JPH05154112A publication Critical patent/JPH05154112A/en
Application granted granted Critical
Publication of JP3154533B2 publication Critical patent/JP3154533B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Eye Examination Apparatus (AREA)

Abstract

PURPOSE:To enable the exact and easy execution of alignment and to obtain measured values having high reliability by providing a diaphragm plate provided with plural pieces of optical elements for allowing the transmission of the luminous flux from a cornea reflected image and shutting off the light from a light source for illumination in its peripheral part. CONSTITUTION:Apertures 9a, 9b, 9c, 9d are provided on the diaphragm plate 9. A filter having the characteristic to allow the transmission of the light of the wavelength of the light source 4 for illumination and prohibits the transmission of the light of the wavelength of a light source 5 for index is fitted into the aperture 9a, the center of which is aligned onto an optical axis L. The filters having the characteristics to prohibit the transmission of the light of the wavelength of the light source 4 for illumination and allows the transmission of the light of the wavelength of the light source 5 for index are fitted into the apertures 9b, 9c, 9d. Then, the cornea reflected light beams past the apertures 9b, 9c, 9d are formed to one piece of the bright point on the image pickup surface of a television camera 10 when the eye to be examined is at the prescribed working distance from a nozzle 1. Three pieces of the bright point images which are slightly out-of-focus are formed when the eye to be examined exists in the position far from the prescribed working distance or exists in the excessively nearby position.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、装置本体と被検眼とを
所定の作動距離に精密に位置合わせすることが必要な眼
科装置、例えば非接触眼圧計のような眼科装置に関する
ものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ophthalmologic apparatus, such as a non-contact tonometer, which is required to precisely align a main body of the apparatus and an eye to be examined with a predetermined working distance.

【0002】[0002]

【従来の技術】従来の眼科装置、例えば非接触眼圧計の
作動距離調整機構としては、特公昭56−6772号公
報に示されたものが知られている。この発明では、検者
は角膜反射像である指標像と前眼部との位置及び指標像
の鮮鋭度とを観察しながら被検眼とノズルとの位置合わ
せを行う。
2. Description of the Related Art As a working distance adjusting mechanism of a conventional ophthalmologic apparatus, for example, a non-contact tonometer, one disclosed in Japanese Patent Publication No. 56-6772 is known. In this invention, the examiner aligns the eye to be inspected with the nozzle while observing the position of the index image, which is a corneal reflection image, the anterior segment and the sharpness of the index image.

【0003】[0003]

【発明が解決しようとする課題】しかしながら、上記装
置では指標像は一つの円であり、正しい作動距離にない
ときは遠すぎるときも近すぎるときも同様な円状のボケ
となり、区別ができない。従って、誤ってノズル先端を
被検眼に衝突させてしまう危険が高いという問題点があ
った。また、非接触眼圧計は被検眼角膜に気体を吹き付
けて測定を行うが、そのときにノズルと角膜との間に被
検者の睫や髪がかかってくることがあり、これは測定誤
差の原因となる。本発明は上記欠点に鑑み案出されたも
ので、アライメントが正確且つ容易にでき、信頼性の高
い測定値を得ることができる眼科装置を提供することを
技術課題とする。
However, in the above device, the index image is one circle, and when the working distance is not correct, the same circular blur occurs when the working distance is too far or too close, and it is impossible to distinguish them. Therefore, there is a problem that there is a high risk that the tip of the nozzle accidentally collides with the eye to be inspected. Further, the non-contact tonometer measures by blowing gas onto the cornea of the eye to be inspected, but the eyelashes and hair of the subject may be caught between the nozzle and the cornea at this time, which is a measurement error. Cause. The present invention has been devised in view of the above-mentioned drawbacks, and an object thereof is to provide an ophthalmologic apparatus capable of performing accurate and easy alignment and obtaining a highly reliable measurement value.

【0004】[0004]

【課題を解決するための手段】上記目的を達成するため
に本発明は以下のような特徴を有する。すなわち (1) 装置本体と被検眼とを所定の作動距離に位置合
わせすることが必要な眼科装置において、前眼部を照明
する照明用光源と、該照明用光源により照明された前眼
部を観察する前眼部観察光学系と、位置合わせのために
前記照明用光源とは異なった波長の指標光束を角膜上に
投射し角膜反射像を形成する指標投影光学系と、角膜反
射像からの光束を透過し前記照明用光源からの光を遮断
する光学素子が複数個周辺部に設けられた絞り板を有
し、角膜反射像を観察する角膜反射像観察光学系と、前
記前眼部観察光学系による前眼部像と前記角膜反射像観
察光学系による角膜反射像を重ねて表示する表示手段
と、からなることを特徴としている。
In order to achieve the above object, the present invention has the following features. That is, (1) In an ophthalmologic apparatus that requires alignment of the apparatus body and the eye to be inspected with a predetermined working distance, an illumination light source that illuminates the anterior segment and an anterior segment illuminated by the illumination source are provided. An anterior ocular segment observation optical system for observation, an index projection optical system for forming a corneal reflection image by projecting an index light beam of a different wavelength from the illumination light source for alignment on the cornea, and a corneal reflection image A corneal reflection image observation optical system for observing a corneal reflection image, which has a diaphragm plate around which a plurality of optical elements that transmit a light flux and block the light from the illumination light source are provided, and the anterior segment observation It is characterized by comprising an anterior segment image by an optical system and a display means for superimposing and displaying a corneal reflection image by the cornea reflection image observation optical system.

【0005】(2) (1)の前眼部観察光学系と角膜
反射像観察光学系は共用し、前記絞り板の中央に前記照
明用光源からの光束を透過する開口を設けたことを特徴
としている。
(2) The anterior ocular segment observing optical system and the corneal reflection image observing optical system of (1) are shared, and an aperture is provided in the center of the diaphragm plate for transmitting the light flux from the illumination light source. I am trying.

【0006】(3) (2)の開口には照明用光源から
の光束を透過し、指標光束を遮断する光学素子を設けた
ことを特徴としている。
(3) An optical element for transmitting the light flux from the illumination light source and blocking the indicator light flux is provided in the opening of (2).

【0007】(4) (1)の絞り板に配置された光学
素子は上下非対称に配置されていることを特徴としてい
る。
(4) The optical elements arranged on the diaphragm plate in (1) are characterized in that they are arranged vertically asymmetrically.

【0008】(5) (4)の光学素子は等間隔に3個
で構成されていることを特徴としている。
(5) The optical element of (4) is characterized in that it is composed of three optical elements at equal intervals.

【0009】(6) (1)の眼科器械は角膜に気体を
吹き付けてその変形量により眼圧を測定する非接触眼圧
計であることを特徴としている。
(6) The ophthalmologic instrument of (1) is characterized in that it is a non-contact tonometer which blows gas onto the cornea and measures the intraocular pressure based on the amount of deformation.

【0010】[0010]

【実施例】以下に、本発明の実施例を図面に基づいて説
明する。図1は本発明を非接触眼圧計に適用した実施例
の光学系配置略図である。1は角膜変形用の気体の噴出
口であるノズルであり、図示しないピストンにより圧縮
気体が角膜に吹き付けて、その変形量をやはり図示しな
い受光素子により検出し、眼圧を測定する(特公昭54
−38437号参照)。2は被検眼であり、3はその角
膜である。4は前眼部を照明する照明用光源(例えば波
長が750nmのものを採用する)である。被検眼2と器
械との位置合わせのための指標投影光学系は、照明用光
源4とは異なる波長を持つ光源である指標用光源5(例
えば波長が950nmのものを採用する)とコリメ−テ
ィングレンズ6とからなる。指標用光源5からの光束は
ハ−フミラ−7により反射され、指標投影光学系の光軸
とノズル1の軸線とは一致せられる。被検眼2に投射さ
れた光は角膜3の鏡面反射により虚像iを形成する。観
察光学系の光軸Lはノズル1の軸線と一致して設けられ
ている。8は対物レンズである。9は絞り板であり、図
2はそれを正面から見た図である。絞り板9上には4か
所の開口9a,9b,9c,9dが設けられている。開
口9aはその中心が光軸L上に合わせてあり、照明用光
源4の波長(750nm)の光は透過するが指標用光源5
の波長(950nm)の光は透過しない特性をもつフィル
タが嵌められている。また、開口9b,9c,9dは光
軸Lから所定距離はなれた位置に等間隔に設けられてい
て、照明用光源4の波長の光は透過せず指標用光源5の
波長の光は透過する特性をもつフィルタがそれぞれに嵌
められている。10はテレビカメラ、11はテレビカメ
ラ10からの出力を表示するテレビモニタである。
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic view of an optical system arrangement of an embodiment in which the present invention is applied to a non-contact tonometer. Reference numeral 1 is a nozzle that is a gas outlet for corneal deformation, and compressed gas is blown onto the cornea by a piston (not shown), and the amount of deformation is also detected by a light receiving element (not shown) to measure the intraocular pressure (JP-B-54).
-38437). 2 is the eye to be inspected and 3 is its cornea. Reference numeral 4 denotes an illumination light source (for example, a light source having a wavelength of 750 nm is used) for illuminating the anterior segment. The index projection optical system for aligning the eye 2 to be inspected with the instrument is collimating with an index light source 5 (for example, a wavelength of 950 nm is adopted) which is a light source having a wavelength different from that of the illumination light source 4. And a lens 6. The light beam from the index light source 5 is reflected by the half mirror 7, and the optical axis of the index projection optical system and the axis of the nozzle 1 are aligned with each other. The light projected on the eye 2 to be examined forms a virtual image i due to specular reflection of the cornea 3. The optical axis L of the observation optical system is provided so as to coincide with the axis of the nozzle 1. Reference numeral 8 is an objective lens. Reference numeral 9 is a diaphragm plate, and FIG. 2 is a view of the diaphragm plate viewed from the front. Four apertures 9a, 9b, 9c, 9d are provided on the diaphragm plate 9. The center of the opening 9a is aligned with the optical axis L, and light of the wavelength (750 nm) of the illumination light source 4 is transmitted, but the index light source 5 is used.
A filter having a characteristic of not transmitting light of the wavelength (950 nm) is fitted. Further, the openings 9b, 9c, 9d are provided at equal distances from the optical axis L at equal intervals, so that the light of the wavelength of the illumination light source 4 is not transmitted and the light of the wavelength of the index light source 5 is transmitted. A filter having characteristics is fitted to each. Reference numeral 10 is a TV camera, and 11 is a TV monitor for displaying the output from the TV camera 10.

【0011】次に、上記のような構成の装置による位置
合わせ動作について説明する。上下に配置された照明用
光源4からの光は被検眼の前眼部を照明する。照明され
た被検眼2の前眼部からの光はノズル1内を通り、ハ−
フミラ−7及び絞り板9の開口9aを透過した後、対物
レンズ8によりテレビカメラ10上に前眼部像を形成す
る。照明用光源4の波長の光は絞り板9上のフィルタに
より開口9aのみしか透過できず、光束の広がりが制限
されるので、前眼部像観察における物体深度は虚像iの
それと比べて深くなる。従って、検者はテレビモニタ1
1上で位置あわせの操作をする間、睫から虹彩まで比較
的はっきりと観察できる。
Next, the positioning operation by the apparatus having the above-mentioned structure will be described. The light from the illumination light sources 4 arranged above and below illuminates the anterior segment of the subject's eye. The light from the anterior segment of the illuminated eye 2 passes through the nozzle 1 and the
After passing through the Fumilla-7 and the aperture 9a of the diaphragm plate 9, the anterior ocular segment image is formed on the television camera 10 by the objective lens 8. The light of the wavelength of the illumination light source 4 can be transmitted only through the aperture 9a by the filter on the diaphragm plate 9, and the spread of the light flux is limited. Therefore, the object depth in the anterior ocular segment image observation becomes deeper than that of the virtual image i. .. Therefore, the examiner is the TV monitor 1
While performing the alignment operation on 1, the eyelashes to the iris can be observed relatively clearly.

【0012】他方、指標用光源5から出た光はコリメ−
ティングレンズ6により平行光束となった後、ハ−フミ
ラ−7によって反射されて角膜3へ正面から投射され
る。角膜3に投射された光は角膜3の鏡面反射により虚
像iを形成する。あたかも虚像iから出射したように見
える角膜3の反射光は、開口9b,9c,9dを透過し
た後、対物レンズ8によりテレビカメラ10上に虚像i
の像を形成する。ノズル1に対して被検眼が所定の作動
距離にあるときには、開口9b,9c,9dを通った角
膜反射光はテレビカメラ10の撮像面上で1個の輝点に
形成され、テレビモニタ11に図3の(a)のように観
察される(前眼部像は省略)。被検眼が所定の作動距離
より遠い位置にあるときは(b)のように、近すぎると
きは(c)のように、それぞれ3個のぼけ気味の輝点像
が形成される。検者は、テレビモニタ11上の前眼部像
と虚像iの像の観察により、被検眼とノズル1との作動
距離及び軸合わせを行う。前眼部像と輝点との関係から
被検眼と器械との位置関係及び距離の遠近を容易に判別
できるので、これらの情報に基づいて、検者はジョイス
ティックを操作して周知の摺動機構により装置を被検眼
に対して相対移動し、位置合わせを行う。
On the other hand, the light emitted from the index light source 5 is collimated.
After being converted into a parallel light flux by the holding lens 6, it is reflected by the half mirror 7 and projected onto the cornea 3 from the front. The light projected on the cornea 3 forms a virtual image i due to specular reflection of the cornea 3. The reflected light of the cornea 3 that appears as if it were emitted from the virtual image i passes through the openings 9b, 9c, 9d, and then is reflected by the objective lens 8 on the television camera 10 to form the virtual image i.
Forming an image of. When the eye to be inspected is at a predetermined working distance with respect to the nozzle 1, the corneal reflected light that has passed through the openings 9b, 9c, 9d is formed at one bright spot on the image pickup surface of the television camera 10 and is displayed on the television monitor 11. It is observed as in FIG. 3A (the anterior segment image is omitted). When the eye to be inspected is located at a position farther than a predetermined working distance, as shown in (b), and when it is too close, as shown in (c), three blurry bright spot images are formed. The examiner observes the images of the anterior segment image and the virtual image i on the television monitor 11 to perform the working distance and axis alignment between the eye to be inspected and the nozzle 1. Since the positional relationship between the eye to be inspected and the instrument and the distance can be easily discriminated from the relationship between the anterior eye image and the bright spot, the examiner operates the joystick based on this information, and the examiner operates a well-known sliding mechanism. The device is moved relative to the eye to be inspected, and alignment is performed.

【0013】以上の実施例は種々の変容が可能であり、
例えば、指標と前眼部を別個に撮像して画像合成により
同一のモニタ上に映出するようにしてもよい。また、絞
りとテレビカメラとの間にハ−フミラ−を斜設してリン
グスリット等のアライメントマ−クをテレビカメラに映
出してもよい。非接触眼圧計についてのみ説明したが、
本発明はこれに限らず眼屈折力計等の種々の眼科装置に
も使用することができること明らかである。
The above embodiment can be variously modified,
For example, the index and the anterior segment of the eye may be separately captured and image-synthesized so as to be displayed on the same monitor. Further, a half mirror may be installed obliquely between the diaphragm and the television camera to display an alignment mark such as a ring slit on the television camera. I explained only the non-contact tonometer,
It is obvious that the present invention is not limited to this and can be used in various ophthalmologic devices such as an eye refractometer.

【0014】[0014]

【発明の効果】本発明によれば、アライメントが正確且
つ容易にでき、信頼性の高い測定値が得られるととも
に、ノズル先端を被検眼に衝突させてしまうような事故
を回避することができる。
According to the present invention, alignment can be performed accurately and easily, a highly reliable measurement value can be obtained, and an accident such as the nozzle tip colliding with the eye to be examined can be avoided.

【図面の簡単な説明】[Brief description of drawings]

【図1】実施例の装置の光学系配置略図である。FIG. 1 is a schematic diagram of an optical system arrangement of an apparatus according to an embodiment.

【図2】絞り板の正面図である。FIG. 2 is a front view of a diaphragm plate.

【図3】絞りの像の様子を示すものであり、(a)は適
正な場合、(b)は遠すぎる場合、(c)は近すぎる場
合を示す。
3A and 3B are views showing an image of a diaphragm, where FIG. 3A shows a proper case, FIG. 3B shows a case that is too far, and FIG. 3C shows a case that is too close.

【符号の説明】[Explanation of symbols]

1 ノズル 2 被検眼 3 角膜 4 照明用光源 5 指標用光源 9 絞り板 10 テレビカメラ 11 テレビモニタ DESCRIPTION OF SYMBOLS 1 Nozzle 2 Eye 3 Eye cornea 4 Light source for illumination 5 Light source for index 9 Aperture plate 10 Television camera 11 Television monitor

Claims (6)

【特許請求の範囲】[Claims] 【請求項1】 装置本体と被検眼とを所定の作動距離に
位置合わせすることが必要な眼科装置において、前眼部
を照明する照明用光源と、該照明用光源により照明され
た前眼部を観察する前眼部観察光学系と、位置合わせの
ために前記照明用光源とは異なった波長の指標光束を角
膜上に投射し角膜反射像を形成する指標投影光学系と、
角膜反射像からの光束を透過し前記照明用光源からの光
を遮断する光学素子が複数個周辺部に設けられた絞り板
を有し、角膜反射像を観察する角膜反射像観察光学系
と、前記前眼部観察光学系による前眼部像と前記角膜反
射像観察光学系による角膜反射像を重ねて表示する表示
手段と、からなることを特徴とする眼科装置。
1. An ophthalmologic apparatus that requires aligning a device body and an eye to be inspected with a predetermined working distance, and an illumination light source for illuminating an anterior segment of the eye, and an anterior segment illuminated by the illumination light source. An anterior segment observation optical system for observing, and an index projection optical system for forming a corneal reflection image by projecting an index light flux of a different wavelength from the illumination light source for alignment on the cornea,
A corneal reflection image observation optical system for observing a corneal reflection image, having a diaphragm plate provided with a plurality of optical elements for transmitting a light flux from the corneal reflection image and blocking light from the illumination light source, An ophthalmologic apparatus comprising: a display unit that superimposes and displays an anterior segment image by the anterior segment observation optical system and a corneal reflection image by the corneal reflection image observation optical system.
【請求項2】 請求項1の前眼部観察光学系と角膜反射
像観察光学系は共用し、前記絞り板の中央に前記照明用
光源からの光束を透過する開口を設けたことを特徴とす
る眼科装置。
2. The anterior ocular segment observation optical system and the corneal reflection image observation optical system according to claim 1 are shared, and an opening for transmitting a light flux from the illumination light source is provided in the center of the diaphragm plate. Ophthalmic device to do.
【請求項3】 請求項2の開口には照明用光源からの光
束を透過し、指標光束を遮断する光学素子を設けたこと
を特徴とする眼科装置。
3. An ophthalmologic apparatus characterized in that the opening according to claim 2 is provided with an optical element that transmits a light beam from an illumination light source and blocks an index light beam.
【請求項4】 請求項1の絞り板に配置された光学素子
は上下非対称に配置されていることを特徴とする眼科装
置。
4. The ophthalmologic apparatus according to claim 1, wherein the optical elements arranged on the diaphragm plate are arranged vertically asymmetrically.
【請求項5】 請求項4の光学素子は等間隔に3個で構
成されていることを特徴とする眼科装置。
5. An ophthalmologic apparatus, wherein the optical element according to claim 4 is composed of three pieces at equal intervals.
【請求項6】 請求項1の眼科器械は角膜に気体を吹き
付けてその変形量により眼圧を測定する非接触眼圧計で
あることを特徴とする眼科装置。
6. The ophthalmologic apparatus according to claim 1, which is a non-contact tonometer that blows gas onto the cornea and measures the intraocular pressure based on the amount of deformation.
JP34218391A 1991-11-30 1991-11-30 Ophthalmic equipment Expired - Fee Related JP3154533B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP34218391A JP3154533B2 (en) 1991-11-30 1991-11-30 Ophthalmic equipment

Applications Claiming Priority (1)

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JP34218391A JP3154533B2 (en) 1991-11-30 1991-11-30 Ophthalmic equipment

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JPH05154112A true JPH05154112A (en) 1993-06-22
JP3154533B2 JP3154533B2 (en) 2001-04-09

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108514402A (en) * 2018-03-14 2018-09-11 苏州兆乘四海通科技有限公司 A kind of self-timer fundus camera

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108514402A (en) * 2018-03-14 2018-09-11 苏州兆乘四海通科技有限公司 A kind of self-timer fundus camera
CN108514402B (en) * 2018-03-14 2024-05-28 苏州兆乘四海通科技有限公司 Self-timer fundus camera

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