JP3809267B2 - Ophthalmic imaging equipment - Google Patents

Ophthalmic imaging equipment Download PDF

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Publication number
JP3809267B2
JP3809267B2 JP36341597A JP36341597A JP3809267B2 JP 3809267 B2 JP3809267 B2 JP 3809267B2 JP 36341597 A JP36341597 A JP 36341597A JP 36341597 A JP36341597 A JP 36341597A JP 3809267 B2 JP3809267 B2 JP 3809267B2
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JP
Japan
Prior art keywords
fixation target
eye
lens
examined
fixation
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
JP36341597A
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Japanese (ja)
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JPH11169349A (en
Inventor
元也 高井
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 JP36341597A priority Critical patent/JP3809267B2/en
Publication of JPH11169349A publication Critical patent/JPH11169349A/en
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Publication of JP3809267B2 publication Critical patent/JP3809267B2/en
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Description

【0001】
【発明の属する技術分野】
本発明は、眼科医院や集団検診等で使用される眼科撮影装置に関するものである。
【0002】
【従来の技術】
従来から、被検眼を所望の撮影部位へ誘導するための光源を設け、被検者にこの光源を固視させることによって被検眼の所望部位を撮影する眼底カメラが、例えば特開平8−308802号公報等で知られている。
【0003】
図5はこの従来の眼底カメラの構成図を示し、被検眼Eと対向する対物レンズ1の背後の光路上には、中央部に開口を有する孔あきミラー2、撮影レンズ3、回動可能なミラー4が配列され、ミラー4の上方の固視光学系には、リレーレンズ5、被検眼Eに固視させる液晶ディスプレイ6、光源7が配列されている。また、ミラー4の後方の光路上には、フィールドレンズ9、視野絞り10、結像レンズ11、撮像手段12が配列され、孔あきミラー2の入射方向の光路上には、レンズ13、リング絞り14、光源15が配列され、リング絞り14はレンズ13に関して孔あきミラー2と略共役に配置されている。また、撮像手段12の出力は制御手段16に接続され、制御手段16の出力はテレビモニタ17に接続され、撮影スイッチ18、固視標移動スイッチ19の出力は、それぞれ制御手段16に接続されている。
【0004】
検者は被検眼Eの所望部位を撮影するために、液晶ディスプレイ6の所望位置を点灯する。このとき、液晶ディスプレイ6の位置情報は電気信号に変換され、図6に示すようにその情報に基づいた位置にキャラクタCが発生する。キャラクタCはテレビモニタ17の観察画面上に眼底像Prに合成されて表示され、検者にこのキャラクタCを目視させる。ここで、テレビモニタ17内の円Sは被検眼Eの略視野を表している。また、所望部位を変更する場合には、例えば十字キー等の固視標移動スイッチ19を作動して、液晶ディスプレイ6上の点灯位置を移動させる。これに連動してキャラクタCも観察画面上を移動する。
【0005】
【発明が解決しようとする課題】
しかしながら上述の従来例では、被検眼の固視可能な視野範囲に固視標の提示範囲を一致させることは、位置調整が困難なばかりか装置が複雑になるため、一般には視野範囲全体をカバーするために提示する固視標移動範囲を視野範囲よりも大きくとる。更には、同一固視標で左右眼を兼用するので、例えば右眼の撮影時であっても、通常固視に不必要な位置又は被検眼視野外に固視目標が移動してしまうと、その場所から所望の固視位置まで戻さなければならない。これらの操作は撮影者に手間を掛けさせてしまい、極めて煩わしいという欠点がある。
【0006】
本発明の目的は、上述の問題点を解消し、固視目標の表示範囲を被検眼視野内の所定範囲内で移動可能な眼科撮影装置を提供することにある。
【0007】
【課題を解決するための手段】
上記目的を達成するための本発明に係る眼科撮影装置は、被検眼の視野範囲の任意の位置に固視標を提示可能な固視標提示手段と、該固視標提示手段を制御すると共に予め被検眼の視野範囲に対応した前記固視標のアドレスを記憶した制御手段とを有し、該制御手段は前記固視標を移動するに際して前記アドレスに基づいて前記固視標の提示位置を制限することを特徴とする。
【0008】
【発明の実施の形態】
本発明を図1〜図4に図示の実施例に基づいて詳細に説明する。
図1は第1の実施例の構成図を示し、被検眼Eと対向する対物レンズ21の背後の光路上には、中央部に開口を有する孔あきミラー22、撮影レンズ23、回動可能なミラー24が配列され、ミラー24の上方の固視光学系には、結像レンズ25、液晶ディスプレイ26、光源27が配列され、ミラー24の後方には、フィールドレンズ28、視野絞り29、結像レンズ30、撮像手段31が配列されている。また、孔あきミラー22の入射方向の光路上には、レンズ32、リング絞り33、眼底観察用光源34が配列されており、ここでリング絞り33はレンズ32に関して孔あきミラー22と略共役に配置されている。そして、撮像手段31の出力は制御手段35に接続され、制御手段35の出力はテレビモニタ36に接続されている。また、制御手段35の出力は液晶ディスプレイ26、撮影スイッチ37、固視標移動スイッチ38に接続されている。
【0009】
このような構成において、眼底観察用光源34を発した光束は、リング絞り33の開口部、レンズ32を通り、孔あきミラー22のミラー部により左方に反射され、対物レンズ21を通り被検眼Eの眼底Erを照明する。眼底Erからの反射光束は、瞳孔Ep、対物レンズ21、孔あきミラー22の開口部、撮影レンズ23、フィールドレンズ28を通り、視野絞り29の近傍に眼底像として一旦結像し、結像レンズ30により撮像手段31に再度結像する。撮像手段31に結像した眼底像Prはビデオ信号に変換され、制御手段35を介してテレビモニタ36に映出される。
【0010】
撮影者はテレビモニタ36に映出されている眼底動画像を観察し、撮影レンズ23を調整して眼底像Prの照準を合わせ、更に被検眼Eの所望部位を撮影するために、固視標移動スイッチ38を動作する。テレビモニタ36には図6で示した従来例と同様の画面が表示され、検者は所望部位に被検眼Eを誘導した後に、撮影スイッチ37を押して眼底観察用光源34を発光し、眼底像Prを制御手段35の内部の記憶手段に静止画像として記録する。図2はこのときの液晶ディスプレイ26の開口部セル26aと遮光部セル26bとの位置関係を示している。
【0011】
図3は被検眼Eから見た液晶ディスプレイ26を示し、円Sに囲まれた範囲が被検眼Eの視野内である。ここで、制御手段16内に予め固視標のアドレス(被検眼の視野範囲及び左右眼の所望位置等)が記憶されており、検者が所望しない位置例えば円Sの外側セル26cに固視標移動スイッチ38を作用させても、開口部セル26aが移動しないようになっている。又は、円Sの外側に固視標移動スイッチ38を作用させた場合に、リセット位置例えば固視標の中心等に自動的に開口部セル26aを移動させるようにしてもよい。
【0012】
図4は第2の実施例の固視目標の正面図を示し、液晶ディスプレイ26の代りに、複数のLEDを並べたLEDアレイ40を使用し、このLEDアレイ40を点灯/消灯して固視位置を変化させるようにしており、点灯部40a及び消灯部40bを示している。
【0013】
この場合においても、円Sの外側に点灯部40aが移動することはない。
【0014】
【発明の効果】
以上説明したように本発明に係る眼科撮影装置は、固視目標を被検者の固視に不必要な位置には移動できないので、検者が間違えて移動させても固視位置が範囲内に止まっているため、修正のための移動も最小限で済み、効率良く眼科撮影が行うことができる。
【図面の簡単な説明】
【図1】第1の実施例の眼科撮影装置の側面図である。
【図2】固視目標の正面図である。
【図3】固視目標の正面図である。
【図4】第2の実施例の固視目標の正面図である。
【図5】従来例の眼科撮影装置の側面図である。
【図6】被検眼の観察画面の説明図である。
【符号の説明】
26 液晶ディスプレイ
27、34 光源
29 視野絞り
31 撮像手段
35 制御手段
36 テレビモニタ
37 撮影スイッチ
38 固視目標移動スイッチ
40 LEDアレイ
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an ophthalmologic photographing apparatus used in an ophthalmic clinic or a mass examination.
[0002]
[Prior art]
Conventionally, a fundus camera that provides a light source for guiding the eye to be examined to a desired imaging region and causes the subject to fixate the light source to image the desired region of the eye to be examined is disclosed in, for example, Japanese Patent Laid-Open No. 8-308802. Known in publications and the like.
[0003]
FIG. 5 shows a configuration diagram of this conventional fundus camera. On the optical path behind the objective lens 1 facing the eye E, a perforated mirror 2 having an opening at the center, a photographing lens 3, and a rotatable lens. The mirror 4 is arranged, and in the fixation optical system above the mirror 4, a relay lens 5, a liquid crystal display 6 for fixing the eye E to be examined, and a light source 7 are arranged. A field lens 9, a field stop 10, an imaging lens 11, and an imaging unit 12 are arranged on the optical path behind the mirror 4, and a lens 13 and a ring stop are provided on the optical path in the incident direction of the perforated mirror 2. 14, a light source 15 is arranged, and the ring diaphragm 14 is arranged substantially conjugate with the perforated mirror 2 with respect to the lens 13. The output of the imaging means 12 is connected to the control means 16, the output of the control means 16 is connected to the television monitor 17, and the outputs of the photographing switch 18 and the fixation target moving switch 19 are connected to the control means 16, respectively. Yes.
[0004]
The examiner turns on the desired position of the liquid crystal display 6 in order to photograph the desired portion of the eye E. At this time, the position information of the liquid crystal display 6 is converted into an electrical signal, and a character C is generated at a position based on the information as shown in FIG. The character C is combined with the fundus oculi image Pr and displayed on the observation screen of the television monitor 17, and allows the examiner to visually observe the character C. Here, the circle S in the television monitor 17 represents the approximate visual field of the eye E to be examined. Further, when changing the desired part, for example, the fixation target moving switch 19 such as a cross key is operated to move the lighting position on the liquid crystal display 6. In conjunction with this, the character C also moves on the observation screen.
[0005]
[Problems to be solved by the invention]
However, in the above-described conventional example, matching the fixation target presentation range to the visual field range in which the subject's eye can be fixed not only makes position adjustment difficult, but also complicates the apparatus, and thus generally covers the entire visual field range. Therefore, the fixation target moving range to be presented is set larger than the visual field range. Furthermore, since the left and right eyes are combined with the same fixation target, for example, even when photographing the right eye, if the fixation target moves outside the visual field of view or a position unnecessary for normal fixation, From there, it must be returned to the desired fixation position. These operations are troublesome for the photographer and are extremely troublesome.
[0006]
An object of the present invention is to provide an ophthalmologic photographing apparatus that can solve the above-described problems and can move a display range of a fixation target within a predetermined range in a visual field of an eye to be examined.
[0007]
[Means for Solving the Problems]
Ophthalmic imaging apparatus according to the present invention for achieving the above object, the fixation target presenting means presentable fixation target at any position in the field of view of the eye, controls the solid target display means Control means for storing an address of the fixation target corresponding to the visual field range of the eye to be examined in advance, and the control means determines the presentation position of the fixation target based on the address when moving the fixation target. It is characterized by limiting .
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described in detail based on the embodiment shown in FIGS.
FIG. 1 is a block diagram of the first embodiment. On the optical path behind the objective lens 21 facing the eye E, a perforated mirror 22 having an opening at the center, a photographing lens 23, and a rotatable lens. An imaging lens 25, a liquid crystal display 26, and a light source 27 are arranged in the fixation optical system above the mirror 24, and a field lens 28, a field stop 29, and an image are formed behind the mirror 24. A lens 30 and an imaging means 31 are arranged. A lens 32, a ring diaphragm 33, and a fundus observation light source 34 are arranged on the optical path in the incident direction of the perforated mirror 22, and the ring diaphragm 33 is substantially conjugate with the perforated mirror 22 with respect to the lens 32. Has been placed. The output of the imaging means 31 is connected to the control means 35, and the output of the control means 35 is connected to the television monitor 36. The output of the control means 35 is connected to the liquid crystal display 26, the photographing switch 37, and the fixation target moving switch 38.
[0009]
In such a configuration, the light beam emitted from the fundus oculi observation light source 34 passes through the opening of the ring diaphragm 33 and the lens 32, is reflected leftward by the mirror portion of the perforated mirror 22, passes through the objective lens 21, and the eye to be examined. Illuminate E fundus Er. The reflected light beam from the fundus Er passes through the pupil Ep, the objective lens 21, the aperture of the perforated mirror 22, the photographing lens 23, and the field lens 28, and once forms a fundus image near the field stop 29, and forms an imaging lens. The image is formed again on the imaging means 31 by 30. The fundus oculi image Pr formed on the image pickup means 31 is converted into a video signal and displayed on the television monitor 36 via the control means 35.
[0010]
The photographer observes the fundus moving image displayed on the television monitor 36, adjusts the photographing lens 23 to aim the fundus image Pr, and further images a desired part of the eye E to be examined. The movement switch 38 is operated. The television monitor 36 displays a screen similar to that of the conventional example shown in FIG. 6, and the examiner guides the eye E to a desired site, and then presses the photographing switch 37 to emit the fundus observation light source 34, Pr is recorded as a still image in the storage means inside the control means 35. FIG. 2 shows the positional relationship between the opening cell 26a and the light shielding cell 26b of the liquid crystal display 26 at this time.
[0011]
FIG. 3 shows the liquid crystal display 26 as viewed from the eye E, and the range surrounded by the circle S is within the field of view of the eye E. Here, an address of the fixation target (a visual field range of the eye to be inspected, a desired position of the left and right eyes, etc.) is stored in the control means 16 in advance, and a fixation is made at a position not desired by the examiner, for example, the outer cell 26c of the circle S Even if the mark moving switch 38 is operated, the opening cell 26a does not move. Alternatively, when the fixation target moving switch 38 is operated outside the circle S, the opening cell 26a may be automatically moved to the reset position, for example, the center of the fixation target.
[0012]
FIG. 4 shows a front view of the fixation target of the second embodiment. Instead of the liquid crystal display 26, an LED array 40 in which a plurality of LEDs are arranged is used, and the LED array 40 is turned on / off to fix the fixation. The position is changed, and the lighting part 40a and the extinguishing part 40b are shown.
[0013]
Even in this case, the lighting part 40a does not move outside the circle S.
[0014]
【The invention's effect】
As described above, the ophthalmologic photographing apparatus according to the present invention cannot move the fixation target to a position unnecessary for fixation of the examinee, so that the fixation position is within the range even if the examiner makes a mistake. Therefore, the movement for correction is minimal, and ophthalmic photography can be performed efficiently.
[Brief description of the drawings]
FIG. 1 is a side view of an ophthalmologic photographing apparatus according to a first embodiment.
FIG. 2 is a front view of a fixation target.
FIG. 3 is a front view of a fixation target.
FIG. 4 is a front view of a fixation target of the second embodiment.
FIG. 5 is a side view of a conventional ophthalmologic photographing apparatus.
FIG. 6 is an explanatory diagram of an observation screen for an eye to be examined.
[Explanation of symbols]
26 Liquid crystal display 27, 34 Light source 29 Field stop 31 Imaging means 35 Control means 36 Television monitor 37 Shooting switch 38 Fixation target movement switch 40 LED array

Claims (4)

被検眼の視野範囲の任意の位置に固視標を提示可能な固視標提示手段と、該固視標提示手段を制御すると共に予め被検眼の視野範囲に対応した前記固視標のアドレスを記憶した制御手段とを有し、該制御手段は前記固視標を移動するに際して前記アドレスに基づいて前記固視標の提示位置を制限することを特徴とする眼科撮影装置。Fixation target presenting means capable of presenting a fixation target at an arbitrary position in the visual field range of the eye to be examined, and controlling the fixation target presenting means, and pre-assigning an address of the fixation target corresponding to the visual field range of the eye to be examined An ophthalmologic photographing apparatus characterized in that the control means limits the presentation position of the fixation target based on the address when moving the fixation target . 被検眼の観察表示手段に前記固視標を電気信号で合成して表示する請求項1に記載の眼科撮影装置。  The ophthalmologic photographing apparatus according to claim 1, wherein the fixation target is combined with an electric signal and displayed on an observation display unit for an eye to be examined. 前記固視標提示手段は液晶ディスプレイとした請求項1に記載の眼科撮影装置。  The ophthalmologic photographing apparatus according to claim 1, wherein the fixation target presenting unit is a liquid crystal display. 前記固視標提示手段は複数個のLEDを配列した光源とした請求項1に記載の眼科撮影装置。  The ophthalmologic photographing apparatus according to claim 1, wherein the fixation target presenting unit is a light source in which a plurality of LEDs are arranged.
JP36341597A 1997-12-16 1997-12-16 Ophthalmic imaging equipment Expired - Fee Related JP3809267B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
JP36341597A JP3809267B2 (en) 1997-12-16 1997-12-16 Ophthalmic imaging equipment

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JP3809267B2 true JP3809267B2 (en) 2006-08-16

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3784247B2 (en) 2000-08-31 2006-06-07 株式会社ニデック Fundus camera
JP2002224038A (en) 2001-01-31 2002-08-13 Nidek Co Ltd Fundus camera
JP3929721B2 (en) 2001-05-25 2007-06-13 株式会社ニデック Fundus camera
CN110582224B (en) * 2017-04-28 2021-12-03 株式会社尼康 Ophthalmic device

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