[go: up one dir, main page]
More Web Proxy on the site http://driver.im/

JP3015042B2 - Hand-held eye refractometer - Google Patents

Hand-held eye refractometer

Info

Publication number
JP3015042B2
JP3015042B2 JP1168458A JP16845889A JP3015042B2 JP 3015042 B2 JP3015042 B2 JP 3015042B2 JP 1168458 A JP1168458 A JP 1168458A JP 16845889 A JP16845889 A JP 16845889A JP 3015042 B2 JP3015042 B2 JP 3015042B2
Authority
JP
Japan
Prior art keywords
eye
hand
subject
reflected
examined
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
Application number
JP1168458A
Other languages
Japanese (ja)
Other versions
JPH0332637A (en
Inventor
嘉 小早川
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP1168458A priority Critical patent/JP3015042B2/en
Publication of JPH0332637A publication Critical patent/JPH0332637A/en
Application granted granted Critical
Publication of JP3015042B2 publication Critical patent/JP3015042B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B3/00Apparatus for testing the eyes; Instruments for examining the eyes
    • A61B3/10Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
    • A61B3/14Arrangements specially adapted for eye photography
    • A61B3/15Arrangements specially adapted for eye photography with means for aligning, spacing or blocking spurious reflection ; with means for relaxing
    • A61B3/152Arrangements specially adapted for eye photography with means for aligning, spacing or blocking spurious reflection ; with means for relaxing for aligning

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Medical Informatics (AREA)
  • Biophysics (AREA)
  • Ophthalmology & Optometry (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Physics & Mathematics (AREA)
  • Molecular Biology (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • 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、例えば眼科医院等で使用される手持ち眼屈
折計に関するものである。
Description: TECHNICAL FIELD The present invention relates to a hand-held eye refractometer used, for example, in an ophthalmic clinic.

[従来の技術] 従来の手持ち眼屈折計において、より正確に被検眼の
屈折力測定を行うには、被検眼に対して手持ち眼屈折計
を正確に位置合わせを行う必要がある。
[Related Art] In a conventional hand-held eye refractometer, in order to more accurately measure the refractive power of the eye to be examined, it is necessary to accurately position the hand-held eye refractometer with respect to the eye to be examined.

[発明が解決しようとする課題] しかし、据置き型の眼屈折計に比べて、手持ち眼屈折
計は安定して位置合わせ行うことは難しいために、正確
な屈折力測定を行うには熟練が必要とされている。
[Problems to be Solved by the Invention] However, since it is difficult to perform stable alignment of a hand-held eye refractometer as compared with a stationary eye refractometer, skill is required to perform accurate refractive power measurement. is needed.

本発明の目的は、操作性の向上を図り、特に未熟練の
検者でも被検眼に対する装置の位置合わせ状態を確認で
き、より正確に眼屈折測定の測定を行うことができる手
持ち眼屈折計を提供することにある。
SUMMARY OF THE INVENTION An object of the present invention is to provide a hand-held eye refractometer capable of improving operability, in particular, enabling an unskilled examiner to check the alignment state of the apparatus with respect to the subject's eye and more accurately perform eye refraction measurement. To provide.

[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手持ち眼屈
折計においては、光束を被検眼眼底に投影しその反射光
を光電的に検出して眼屈折測定する測定系と、被検眼位
置合わせのために被検眼を光電検出する検出系と、前記
測定系と検出系を含む本体部に一体的に設け検出系の検
出結果を表示する表示部材と、前記本体部に一体的に設
け被検眼顔に当接する当接部材とを具備したことを特徴
とする。
Means for Solving the Problems In a hand-held eye refractometer according to the present invention for achieving the above object, a light beam is projected onto a fundus of a subject's eye, and reflected light is photoelectrically detected to measure eye refraction. A measurement system, a detection system for photoelectrically detecting the subject's eye for alignment of the subject's eye, a display member integrally provided in a main body including the measurement system and the detection system, and a display member for displaying a detection result of the detection system; And a contact member provided integrally with the section and in contact with the face of the eye to be examined.

[作用] 上記の構成を有する手持ち眼屈折計は、被検眼に対し
て本体部を手で保持して測定する場合に、当接部材を当
接する被検眼顔と表示部材による表示を見ながら容易に
被検眼に対する位置合わせができると共に、眼屈折測定
を正確に行うことが可能になる。
[Operation] The hand-held eye refractometer having the above-described configuration can easily perform the measurement while holding the main body portion by hand with respect to the subject's eye while viewing the display of the face of the subject's eye contacting the contact member and the display member. In addition, the eye can be positioned with respect to the subject's eye, and the eye refraction can be accurately measured.

[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.

第1図は第1の実施例による手持ち眼屈折計を被検者
の顔部に当接させた構成図を示し、筐体状の装置本体1
には被検者Sの顔部に当接させる突起部2が設けられて
いる。位置合わせと屈折値測定のための装置本体1内部
の測定光源3から被検眼Eに至る光路P1上には、測定光
源3側から順にレンズ4、第2図に示すように中心開口
5aを有する中心開口絞り5、穴開きミラー6、光分割ミ
ラー7、レンズ8、ダイクロイックミラー9が設けられ
ている。
FIG. 1 shows a configuration diagram in which a hand-held eye refractometer according to a first embodiment is brought into contact with a face of a subject, and a housing-shaped device main body 1 is shown.
Is provided with a protruding portion 2 to be brought into contact with the face of the subject S. On the optical path P1 from the measurement light source 3 inside the apparatus main body 1 for alignment and refraction value measurement to the subject's eye E, a lens 4 is arranged in order from the measurement light source 3 side, and a central aperture
A central aperture stop 5 having 5a, a perforated mirror 6, a light splitting mirror 7, a lens 8, and a dichroic mirror 9 are provided.

被検眼Eからの反射光が光分割ミラー7により反射さ
れる方向の光軸P2上には、第3図に示すように5つのセ
ンサ要素10a〜10eから構成され、中心のセンサ要素10a
の周囲にセンサ要素10b〜10eが配置された光電センサ10
が設けられている。また、センサ要素10a〜10eの出力が
それぞれ接続された5個のLED11a〜11eが第4図に示す
ように、検者が観察できるように装置本体1の外部に取
り付けられている。
On the optical axis P2 in the direction in which the reflected light from the eye E is reflected by the light splitting mirror 7, there are five sensor elements 10a to 10e as shown in FIG.
Sensor 10 in which sensor elements 10b to 10e are arranged around
Is provided. As shown in FIG. 4, five LEDs 11a to 11e to which outputs of the sensor elements 10a to 10e are connected are mounted outside the apparatus main body 1 so that the examiner can observe them.

被検眼Eからの反射光が穴開きミラー6により反射さ
れる方向の光軸P3上には、第5図に示すよう開口12a〜1
2fを有する6穴絞り12、レンズ13、第6図に示すように
6個のくさびプリズム14a〜14fから構成される分離プリ
ズム14、光電センサ15が配置されている。また、被検眼
Eとダイクロイックミラー9を結ぶ光路の延長上でダイ
クロイックミラー9の後方には、固視標16が設けられて
いる。なお、ダイクロイックミラー9は位置合わせや測
定の際に使用する近赤外光は反射し、固視標16を照射し
た可視光は透過する特性を有している。また、17は制御
部であり、制御部17には光電センサ10、15の出力が接続
され、制御部17の出力は測定光源3に接続されている。
On the optical axis P3 in the direction in which the reflected light from the eye E is reflected by the perforated mirror 6, the apertures 12a to 12a are provided as shown in FIG.
A 6-hole aperture 12 having 2f, a lens 13, a separation prism 14 composed of six wedge prisms 14a to 14f, and a photoelectric sensor 15 are arranged as shown in FIG. A fixation target 16 is provided behind the dichroic mirror 9 on the extension of the optical path connecting the subject's eye E and the dichroic mirror 9. The dichroic mirror 9 has a property of reflecting near-infrared light used for alignment and measurement, and transmitting visible light irradiated on the fixation target 16. Reference numeral 17 denotes a control unit. The outputs of the photoelectric sensors 10 and 15 are connected to the control unit 17, and the output of the control unit 17 is connected to the measurement light source 3.

屈折値測定の際には検者は装置本体1を手持ちして、
光軸P4を被検眼Eの片眼の光軸に一致させるように突起
部2を被検者Sの被検眼下方の顔部に当接し、ダイクロ
イックミラー9を通して被検眼Eを見ながら、被検者S
にダイクロイックミラー9を介して固視標16を固視させ
る。
At the time of refraction value measurement, the examiner holds the device body 1,
The projection 2 is brought into contact with the face below the subject's eye of the subject S so that the optical axis P4 coincides with the optical axis of one eye of the subject's eye E, and the subject is examined while viewing the subject's eye E through the dichroic mirror 9. Person S
The fixation target 16 is fixed through the dichroic mirror 9.

測定光源3からの光束はレンズ4、中心開口絞り5、
穴開きミラー6、光分割ミラー7、レンズ8を経て、ダ
イクロイックミラー9により被検眼E方向に反射されて
被検眼Eに到達し、その角膜反射像からの光束は同じ光
路を戻り、光分割ミラー7で反射された光束は光電セン
サ10上に投影される。また、眼底Erで反射された眼底反
射光は、光分割ミラー7、穴開きミラー6を経て6穴絞
り12、レンズ13を通過して、分離プリズム14で光軸P3か
ら分離する方向に偏向された後に、第7図に示すように
6個の眼底反射光が光電センサ15上に投影される。
The luminous flux from the measurement light source 3 is a lens 4, a central aperture stop 5,
After passing through the perforated mirror 6, the light splitting mirror 7, and the lens 8, the light is reflected by the dichroic mirror 9 in the direction of the eye E to reach the eye E, and the luminous flux from the corneal reflection image returns along the same optical path. The light beam reflected by 7 is projected on the photoelectric sensor 10. Further, the fundus reflection light reflected by the fundus Er passes through a light splitting mirror 7, a perforated mirror 6, a 6-hole aperture 12, and a lens 13, and is deflected by a separation prism 14 in a direction to be separated from the optical axis P3. Thereafter, as shown in FIG. 7, six fundus reflection lights are projected on the photoelectric sensor 15.

位置合わせの際に、光電センサ10のセンサ要素10a〜1
0eで予め設定された閾値以上の光量が受光されると、受
光された各センサ要素10a〜10eに接続されている対応す
るLED11a〜11eが点灯するが、この閾値はセンサ要素10a
〜10eに入射する光量が大きい場合にLED11a〜11eが点灯
するように設定されている。そして、角膜反射光束が光
電センサ10の中心部のセンサ要素10aで受光されると、
位置合わせが終了したことが検知される。
During alignment, the sensor elements 10a to 1 of the photoelectric sensor 10
When a light amount equal to or greater than a predetermined threshold value is received at 0e, the corresponding LEDs 11a to 11e connected to the received sensor elements 10a to 10e are turned on.
It is set so that the LEDs 11a to 11e are turned on when the amount of light incident on .about.10e is large. When the corneal reflected light beam is received by the sensor element 10a at the center of the photoelectric sensor 10,
It is detected that the alignment has been completed.

位置合わせがなされると、制御部17の指令により測定
光源3が点灯され、屈折値測定のための眼底反射光束が
光電センサ15上に受光するまでは数10ミリ秒で終了す
る。被検者Sは遠方の固視標16を固視しているので、位
置合わせが終了して屈折値測定が開始される際に被検眼
Eの調節を誘導する必要はない。
When the alignment is performed, the measurement light source 3 is turned on by a command from the control unit 17, and it takes several tens of milliseconds until the fundus reflection light beam for measuring the refraction value is received on the photoelectric sensor 15. Since the subject S fixes his / her eyes on the distant fixation target 16, there is no need to guide the adjustment of the subject's eye E when the alignment is completed and the refraction value measurement is started.

なお、屈折値測定方法は上述の実施例以外にも考えら
れるが、上述の実施例では各経線の情報を同時に取り込
み、被検眼Eの動きの影響を受けないので精度の高い測
定ができる。また、突起部2は被検者Sの被検眼Eの下
方の顔部に当接されているが、これは被検眼Eの上方よ
りも下方が人種間等の差異が小さいためである。
In addition, although a refraction value measuring method is conceivable other than the above-described embodiment, in the above-described embodiment, information of each meridian is simultaneously captured and the measurement is performed with high accuracy because it is not affected by the movement of the eye E. The protruding portion 2 is in contact with the face below the eye E of the subject S because the difference between races is smaller below the eye E than above the eye E.

第8図は第2の実施例の装置本体内の構成図を示し、
第1図の光路P1上の光分割ミラー7の代りにダイクロイ
ックミラー18が設けられ、ダイクロイックミラー18によ
り反射される方向の光軸P2には、凹レンズから成るレン
ズ19、2個のくさびプリズムから成る分離プリズム20、
ミラー21が設けられ、光軸P3上にはミラー21で反射され
る光束を光電センサ15に導くためのダイクロイックミラ
ー22が設けられている。また、位置合わせのための位置
合わせ光源23がレンズ8の近傍に光路P1から離れて設け
られており、この位置合わせ光源23からの光束の波長は
測定測定光源3からの光束の波長とは異なっており、ダ
イクロイックミラー18とダイクロイックミラー22はこれ
らの波長を区別できるようにされている。
FIG. 8 shows a configuration diagram of the inside of the apparatus main body of the second embodiment,
A dichroic mirror 18 is provided instead of the light splitting mirror 7 on the optical path P1 in FIG. 1, and the optical axis P2 in the direction reflected by the dichroic mirror 18 includes a lens 19 composed of a concave lens and two wedge prisms. Separation prism 20,
A mirror 21 is provided, and a dichroic mirror 22 for guiding a light beam reflected by the mirror 21 to the photoelectric sensor 15 is provided on the optical axis P3. An alignment light source 23 for alignment is provided near the lens 8 and away from the optical path P1, and the wavelength of the light beam from this alignment light source 23 is different from the wavelength of the light beam from the measurement light source 3. Thus, the dichroic mirror 18 and the dichroic mirror 22 can distinguish these wavelengths.

位置合わせ光源23からの光束は、ダイクロイックミラ
ー9で反射されて被検眼Eに到達し、角膜反射光束は同
じ光路を戻り、レンズ8を経てダイクロイックミラー18
で反射され、レンズ19を経て分離プリズム20で光軸P2か
ら分離され、更にミラー21とダイクロイックミラー22で
反射され、光電センサ15上で第9図に示すような被検眼
Eの前眼部反射像E′と角膜反射像Ec′が受光される。
The light beam from the positioning light source 23 is reflected by the dichroic mirror 9 and reaches the eye E, and the cornea reflected light beam returns along the same optical path and passes through the lens 8 to the dichroic mirror 18.
And is reflected from the optical axis P2 by the separation prism 20 through the lens 19, further reflected by the mirror 21 and the dichroic mirror 22, and reflected on the photoelectric sensor 15 by the anterior segment of the eye E as shown in FIG. The image E 'and the corneal reflection image Ec' are received.

屈折値測定の際の測定光源3からの光束は、レンズ
4、中心開口絞り5、穴開きミラー6、ダイクロイック
ミラー18、レンズ8、ダイクロイックミラー9を経て被
検眼Eの眼底に至り、眼底反射光束は同じ光路P1を戻
り、穴開きミラー6で反射されて6穴絞り12、レンズ1
3、分離プリズム14を経てダイクロイックミラー22を透
過して光電センサ15で受光される。
The luminous flux from the measurement light source 3 at the time of refraction value measurement reaches the fundus of the eye E through the lens 4, the center aperture stop 5, the perforated mirror 6, the dichroic mirror 18, the lens 8, and the dichroic mirror 9, and the fundus reflected luminous flux Returns to the same optical path P1 and is reflected by the perforated mirror 6 to form a 6-hole aperture 12, a lens 1
3. The light passes through the dichroic mirror 22 through the separation prism 14 and is received by the photoelectric sensor 15.

なお、分離プリズム20を使用しない場合には、光電セ
ンサ15上で前眼部反射像E′が受光されるので、これを
液晶映像表示素子等で表示して位置合わせをしてもよ
い。角膜反射像Ec′は特に光量が多いので、閾値を設定
してこの角膜反射像Ec′の位置を検出することができ
る。これらの2個の角膜反射像Ec′の間隔から光軸方向
の位置合わせのずれを検知し、角膜反射像Ec′の位置か
ら光軸に垂直な面内での位置合わせのずれを検知して位
置合わせを行う。この位置合わせがなされると、屈折値
測定が先の実施例と同様に行われる。
When the separating prism 20 is not used, the anterior ocular segment reflected image E 'is received on the photoelectric sensor 15, so that it may be displayed on a liquid crystal display device or the like for alignment. Since the corneal reflection image Ec 'has a particularly large amount of light, a threshold value can be set to detect the position of the corneal reflection image Ec'. The positional deviation in the optical axis direction is detected from the interval between these two corneal reflection images Ec ', and the positional deviation in a plane perpendicular to the optical axis is detected from the position of the corneal reflection image Ec'. Perform positioning. Once this alignment has been made, refraction measurement is performed as in the previous embodiment.

[発明の効果] 以上説明したように本発明に係る手持ち眼屈折計にお
いては、被検眼顔と表示部材による表示を見ながら、容
易に被検眼に対する本体部の位置合わせができると共
に、眼屈折測定を正確に行うことが可能になる。
[Effects of the Invention] As described above, in the hand-held eye refractometer according to the present invention, the position of the main body with respect to the subject's eye can be easily adjusted while viewing the display on the face of the subject's eye and the display member, and the eye refraction can be measured. Can be performed accurately.

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

図面は本発明に係る手持ち眼屈折計の実施例を示し、第
1図は第1の実施例の構成図、第2図は中心開口絞りの
正面図、第3図は光電センサの正面図、第4図はモニタ
の正面図、第5図は6穴絞りの正面図、第6図は分離プ
リズムの正面図、第7図は光電センサ上の眼底反射像の
説明図、第8図は第2の実施例の構成図、第9図は光電
センサ上の反射像の説明図である。 符号1は装置本体、3は測定光源、6は穴あきミラー、
9、18、22はダイクロイックミラー、10、15光電セン
サ、11はLED、16は固視標、17は制御部、23は位置合わ
せ光源である。
Drawings show an embodiment of a hand-held eye refractometer according to the present invention, FIG. 1 is a configuration diagram of the first embodiment, FIG. 2 is a front view of a central aperture stop, FIG. 3 is a front view of a photoelectric sensor, FIG. 4 is a front view of a monitor, FIG. 5 is a front view of a 6-hole aperture, FIG. 6 is a front view of a separation prism, FIG. 7 is an explanatory view of a fundus reflection image on a photoelectric sensor, and FIG. FIG. 9 is a configuration diagram of the second embodiment, and FIG. 9 is an explanatory diagram of a reflected image on the photoelectric sensor. Reference numeral 1 denotes an apparatus main body, 3 denotes a measurement light source, 6 denotes a perforated mirror,
Reference numerals 9, 18, and 22 denote dichroic mirrors, 10, 15 photoelectric sensors, 11 denotes LEDs, 16 denotes a fixation target, 17 denotes a control unit, and 23 denotes a positioning light source.

Claims (3)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】光束を被検眼眼底に投影しその反射光を光
電的に検出して眼屈折測定する測定系と、被検眼位置合
わせのために被検眼を光電検出する検出系と、前記測定
系と検出系を含む本体部に一体的に設け検出系の検出結
果を表示する表示部材と、前記本体部に一体的に設け被
検眼顔に当接する当接部材とを具備したことを特徴とす
る手持ち眼屈折計。
A measuring system for projecting a light beam onto the fundus of the eye to be examined and photoelectrically detecting the reflected light to measure the refraction of the eye; a detection system for photoelectrically detecting the eye to be examined for positioning the eye; A display member provided integrally with the main body including the system and the detection system to display a detection result of the detection system; and a contact member provided integrally with the main body and abutting on the face of the eye to be examined. Handheld eye refractometer.
【請求項2】前記表示部材は複数のLEDで構成した請求
項1に記載の手持ち眼屈折計。
2. The hand-held eye refractometer according to claim 1, wherein said display member comprises a plurality of LEDs.
【請求項3】前記検出系は被検眼の角膜反射光を検出す
る請求項1に記載の手持ち眼屈折計。
3. The hand-held eye refractometer according to claim 1, wherein said detection system detects corneal reflected light of the eye to be examined.
JP1168458A 1989-06-30 1989-06-30 Hand-held eye refractometer Expired - Fee Related JP3015042B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1168458A JP3015042B2 (en) 1989-06-30 1989-06-30 Hand-held eye refractometer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1168458A JP3015042B2 (en) 1989-06-30 1989-06-30 Hand-held eye refractometer

Related Child Applications (1)

Application Number Title Priority Date Filing Date
JP15134999A Division JP3181893B2 (en) 1999-05-31 1999-05-31 Eye refractometer

Publications (2)

Publication Number Publication Date
JPH0332637A JPH0332637A (en) 1991-02-13
JP3015042B2 true JP3015042B2 (en) 2000-02-28

Family

ID=15868487

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1168458A Expired - Fee Related JP3015042B2 (en) 1989-06-30 1989-06-30 Hand-held eye refractometer

Country Status (1)

Country Link
JP (1) JP3015042B2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2962588B2 (en) * 1991-03-18 1999-10-12 キヤノン株式会社 Eye measurement device
US6033074A (en) * 1997-12-09 2000-03-07 Nikon Corporation Subjective eye refractive power measuring apparatus
JP2936260B1 (en) 1998-03-19 1999-08-23 株式会社地盤試験所 Mechanical ground anchor
JP6981148B2 (en) * 2017-09-29 2021-12-15 カシオ計算機株式会社 Imaging device and dermoscopy camera

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61259640A (en) * 1985-05-15 1986-11-17 株式会社トプコン Alignment detector of ophthalmic machine
JPH031834A (en) * 1989-05-29 1991-01-08 Riyuushiyou Sangyo Kk Optic refractive index measuring apparatus
JP2624516B2 (en) * 1988-06-27 1997-06-25 隆祥産業株式会社 Eye refractometer

Also Published As

Publication number Publication date
JPH0332637A (en) 1991-02-13

Similar Documents

Publication Publication Date Title
JPH04200436A (en) Ophthamologic apparatus
JP3015042B2 (en) Hand-held eye refractometer
US5781275A (en) Eye refractometer and eye refractive power measuring apparatus for electro-optically measuring the refractive power of the eye
JPH0315434A (en) Eye refractometer
JP2001231752A (en) Ophthalmometer
JP2945092B2 (en) Eye refractometer
JPH07231875A (en) Optometrical device
JPH0654807A (en) Ophthalmic device
JP4436914B2 (en) Eye refractive power measuring device
JP3181893B2 (en) Eye refractometer
JPH10272102A (en) Ophthalmic device
JPH04269937A (en) Ophthalmologic apparatus
JP3452388B2 (en) Ophthalmic instruments
JP2783618B2 (en) Eye refractive power measuring device
JP3575825B2 (en) Ophthalmic equipment
JP3015052B2 (en) Eye refractometer
JPH0554325B2 (en)
JPH049135A (en) Eye refraction meter
JPH0473040A (en) Ophthalmologic measuring apparatus
JP2001161644A (en) Optometer
JPH0554326B2 (en)
JPH10337276A (en) Optometry device
JPH04256725A (en) Ophthalmic device
JP2775269B2 (en) Eye refractive power measuring device
JPH049138A (en) Eye pressure meter

Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees