JP2002017676A - Auto-refractometer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and reliably measure the refractive index of an eye even in case of an eye with a microcoria whose pupil diameter is smaller than the diameter of measurement luminous flux. SOLUTION: A measurement section is two-dimensionally driven by a driving means while a light source remains on so that a measurement optical axis draws a circle around a pupil. The luminous flux accumulated in a photoelectric sensor which made a rotation as shown in Figs. (a)-(d) forms a ring-like luminous flux Ld shown in Fig. (e). The luminous flux Ld obtained in this way is operated like a case where the luminous flux is received at one time without eccentricity to determine the refractive index.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、眼科病院や眼鏡店
などで使われるオートレフラクトメータに関するもので
ある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auto-refractometer used in ophthalmic hospitals and optician stores.

【０００２】[0002]

【従来の技術】オートレフラクトメータにおいては、測
定光束径よりも瞳孔が小さいときは測定が難しい。この
ような小瞳孔眼の測定に関して、３方向に逐次に偏芯し
て瞳孔の片側から投影した眼底光束を逐次に検出し、乱
視を含む屈折測定をする技術が特開平４−１４１１３３
号公報に開示されている。2. Description of the Related Art In an auto-refractometer, measurement is difficult when the pupil is smaller than the measured light beam diameter. With respect to such measurement of the small pupil eye, Japanese Patent Laid-Open No. 4-141133 discloses a technique for sequentially detecting retinal luminous flux projected from one side of the pupil while being eccentric in three directions, and performing refraction measurement including astigmatism.
No. 6,009,045.

【０００３】[0003]

【発明が解決しようとする課題】しかしながら上述の従
来例においては、受光光束の受光画面上の座標位置で屈
折力を測定している。However, in the above conventional example, the refractive power is measured at the coordinate position of the received light beam on the light receiving screen.

【０００４】本発明の目的は、上述の問題点を解消し、
瞳孔径が測定光束径よりも小さな場合でも容易かつ確実
に眼屈折測定できるオートレフラクトメータを提供する
ことにある。An object of the present invention is to solve the above-mentioned problems,
An object of the present invention is to provide an auto-refractometer capable of easily and reliably measuring an eye refraction even when a pupil diameter is smaller than a measurement light beam diameter.

【０００５】また、本発明の他の目的は、座標位置を使
わずに、精度良く小瞳孔眼の眼屈折測定をするオートレ
フラクトメータを提供することにある。Another object of the present invention is to provide an auto-refractometer for accurately measuring the refraction of a small pupil eye without using a coordinate position.

【０００６】[0006]

【課題を解決するための手段】上記目的を達成するため
の本発明に係るオートレフラクトメータは、眼底に光束
を投影し反射光を検出し眼屈折測定をするオートレフラ
クトメータにおいて、測定光学系をアライメント駆動す
る駆動手段により測定光学系の光軸が瞳孔中心の周りを
回るように駆動しながら検出した信号により、乱視を合
む眼屈折測定をすることを特徴とする。According to the present invention, there is provided an auto-refractometer for projecting a light beam onto a fundus, detecting reflected light, and measuring refraction of the eye. The apparatus is characterized in that an eye refraction measurement for astigmatism is performed based on a signal detected while driving the optical axis of the measurement optical system around the center of the pupil by a driving unit for performing alignment driving.

【０００７】また、本発明に係るオートレフラクトメー
タは、瞳孔と共役位置に設け光軸中心と周辺で光束を分
割する光分割部材と、該光分割部材を介して眼底に光束
を投影する投影系と眼底反射光を撮像素子で受光する受
光系とを含む測定光学系と、該測定光学系をアライメン
ト駆動する駆動手段と、該駆動手段により前記測定光学
系をその光軸が瞳孔中心の周囲を移動しながら前記撮像
素子で受光した信号により屈折測定をすることを特徴と
する。An auto-refractometer according to the present invention includes a light splitting member provided at a position conjugate with the pupil for splitting a light flux at the center and periphery of the optical axis, and a projection system for projecting the light flux onto the fundus via the light splitting member. A measuring optical system including a light receiving system that receives light reflected by the fundus with an image sensor, a driving unit that drives the alignment of the measuring optical system, and the driving unit moves the measuring optical system so that the optical axis of the measuring optical system is around the center of the pupil. It is characterized in that refraction is measured by a signal received by the image sensor while moving.

【０００８】[0008]

【発明の実施の形態】本発明を図示の実施の形態に基づ
いて詳細に説明する。図１は第１の実施の形態のオート
レフラクトメータの構成図を示す。測定光学系を収納す
る測定部１は、基台２上に３個のステップモータ等から
構成される駆動手段３を介して三次元的に移動可能なよ
うに載置されている。基台２には、頂部に測定ボタン４
を設けた操作桿５が設けられ、被検者Ｓの顔を固定する
図示しない額当てなどの顔固定部材が取り付けられてい
る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail based on the illustrated embodiment. FIG. 1 shows a configuration diagram of the auto-refractometer according to the first embodiment. A measuring unit 1 that houses a measuring optical system is mounted on a base 2 so as to be three-dimensionally movable via a driving unit 3 including three step motors and the like. The measurement button 4 is provided on the base 2
Is provided, and a face fixing member such as a forehead rest (not shown) for fixing the face of the subject S is attached.

【０００９】被検者Ｓの視線方向の光軸Ｏ１上には、被
検眼Ｅ側から測定光波長を透過するダイクロイックミラ
ーである光分割部材６、対物レンズ７、孔あきミラー
８、瞳孔Ｐと略共役な中心開口絞り９、レンズ１０、赤
外ＬＥＤから成る測定光源１１が配列されている。光分
割部材６の反射方向の光軸Ｏ２上には、レンズ１２、可
視光を透過するダイクロイックミラーである光分割部材
１３、ミラー１４、光軸方向に動き視標視度を変えるレ
ンズ１５、固視視標１６が設けられている。光分割部材
１３の反射方向の前眼部光軸Ｏ３上には、前眼部を結像
するレンズ１７、ビデオカメラである撮像手段１８が設
けられている。また、孔あきミラー８の反射方向の受光
光軸Ｏ４上には、瞳孔Ｐに略共役でリング開口を有する
受光絞り１９、光束を光軸Ｏ４の外方向に偏向する逆円
錐プリズムである光偏向部材２０、レンズ２１、正視眼
底に共役なＣＣＤなどの撮像素子である光電センサ２２
が配列されている。On the optical axis O1 in the direction of the line of sight of the subject S, a light splitting member 6, which is a dichroic mirror that transmits the measurement light wavelength from the eye E, an objective lens 7, a perforated mirror 8, a pupil P A substantially conjugate center aperture stop 9, a lens 10, and a measurement light source 11 composed of an infrared LED are arranged. On the optical axis O2 in the reflection direction of the light splitting member 6, a lens 12, a light splitting member 13, which is a dichroic mirror transmitting visible light, a mirror 14, a lens 15, which moves in the optical axis direction and changes the visual target diopter, A visual target 16 is provided. On the anterior segment optical axis O3 in the reflection direction of the light splitting member 13, a lens 17 for forming an image of the anterior segment and an imaging means 18 as a video camera are provided. On the light receiving optical axis O4 in the direction of reflection of the perforated mirror 8, a light receiving stop 19 having a ring opening substantially conjugate to the pupil P, and an optical deflector that is an inverted conical prism that deflects a light beam outward from the optical axis O4. A photoelectric sensor 22 which is an imaging device such as a member 20, a lens 21, and a CCD conjugated to the ocular fundus.
Are arranged.

【００１０】光電センサ２２の信号は演算制御手段２３
に接続され、撮像手段１８の出力はテレビモニタ２４、
演算制御手段２３に接続されている。また、測定部１の
検者側には小瞳孔測定時に押しボタン２５が設けられて
おり、この押しボタン２５は演算制御手段２３に接続さ
れている。The signal of the photoelectric sensor 22 is calculated by an arithmetic control unit 23.
The output of the imaging means 18 is a television monitor 24,
It is connected to arithmetic control means 23. Further, a push button 25 is provided on the examiner side of the measuring unit 1 when measuring a small pupil, and this push button 25 is connected to the arithmetic and control unit 23.

【００１１】測定時において、検者はテレビモニタ２４
を見て瞳孔Ｐが映るように操作桿５を操作して駆動手段
３を駆動する。瞳孔Ｐがテレビモニタ２４の画面に入る
ことを確認して測定ボタン４を押すと、撮像手段１８の
信号が逐次に演算制御手段２３に取り込まれ、瞳孔Ｐの
位置が認識される。瞳孔Ｐ内は暗く映るので、輝度レベ
ルの低い部分として瞳孔Ｐを認識できる。瞳孔Ｐの中心
が測定光軸Ｏ１に合うように駆動手段３を制御する。合
致すると測定光源１１を点灯し測定を開始する。At the time of measurement, the examiner uses the TV monitor 24
, The operating means 5 is operated to drive the driving means 3 so that the pupil P is projected. When the measurement button 4 is pressed after confirming that the pupil P is on the screen of the television monitor 24, the signal of the imaging means 18 is sequentially taken into the arithmetic control means 23, and the position of the pupil P is recognized. Since the inside of the pupil P appears dark, the pupil P can be recognized as a portion having a low luminance level. The driving unit 3 is controlled so that the center of the pupil P is aligned with the measurement optical axis O1. When they match, the measurement light source 11 is turned on to start the measurement.

【００１２】瞳孔Ｐの中心からスポット光束を眼底に投
影し、瞳孔Ｐで投影測定の周りからリング状に取り出し
た光束を光電センサ２２にリング光束として受光する。
得られたリング像の大きさを基に被検眼Ｅの球面度数を
演算し、楕円の程度により乱視度数を演算し、その方向
で乱視角度をそれぞれ演算する。この予備測定による視
度に基づいてレンズ２１の位置を制御し、視度誘導を行
って本測定を行い屈折値を求める。A spot light beam is projected onto the fundus from the center of the pupil P, and a light beam extracted in a ring shape from around the projection measurement at the pupil P is received by the photoelectric sensor 22 as a ring light beam.
The spherical power of the eye E is calculated based on the size of the obtained ring image, the astigmatic power is calculated based on the degree of the ellipse, and the astigmatic angle is calculated in the direction. Based on the diopter obtained by the preliminary measurement, the position of the lens 21 is controlled, diopter guidance is performed, the main measurement is performed, and the refraction value is obtained.

【００１３】瞳孔Ｐが測定光束よりも小さい小瞳孔眼の
場合に、押しボタン２５を押すと偏芯しながら測定する
ように制御される。測定光軸Ｏ１が瞳孔Ｐの中心の周り
を円を描くように、測定光源１１を点灯したまま駆動手
段３により測定部１を二次元的に駆動する。図２はこの
場合の瞳孔Ｐでの光軸Ｏ１の軌跡Ｔを示す。When the pupil P is a small pupil eye smaller than the measurement light beam, when the push button 25 is pressed, the control is performed such that the measurement is performed while being eccentric. The measurement unit 1 is two-dimensionally driven by the driving unit 3 while the measurement light source 11 is turned on so that the measurement optical axis O1 draws a circle around the center of the pupil P. FIG. 2 shows a locus T of the optical axis O1 at the pupil P in this case.

【００１４】図３は瞳孔と偏芯された光束の関係を示
し、光軸Ｏ１は投影光束Ｌａと受光光束Ｌｂの中心にあ
る。図３(a)、(b)、(c)、(d)はそれぞれ左上右下に偏芯
した位置の関係を示している。瞳孔Ｐに投影光束Ｌａと
受光光束Ｌｂの異なる一部が入射している。図４は偏芯
した場合の光電センサ２２上の受光光束Ｌｃをそれぞれ
示している。FIG. 3 shows the relationship between the pupil and the decentered light beam, and the optical axis O1 is at the center of the projection light beam La and the received light beam Lb. 3 (a), 3 (b), 3 (c) and 3 (d) show the relationship between the positions eccentric to the upper left and lower right, respectively. Different portions of the projection light beam La and the received light beam Lb enter the pupil P. FIG. 4 shows the received light beam Lc on the photoelectric sensor 22 when the eccentricity occurs.

【００１５】図２に示すように、１回転した光電センサ
２２に蓄積された光束は、図４(e)に示すようにリング
光束Ｌｄとなる。このようにして得られた光束Ｌｄを、
偏芯せずに一度に受光した場合と同様に演算して屈折値
を求める。ただし、視度誘導の雲霧時には一方向に偏芯
して行う。睫の影響のない図３(b)に示すように、下方
に偏芯した状態で予備測定により視度誘導を行い、本測
定では上述のように偏芯方向を変えながら測定する。As shown in FIG. 2, the luminous flux accumulated in the photoelectric sensor 22 after one rotation becomes a ring luminous flux Ld as shown in FIG. 4 (e). The luminous flux Ld thus obtained is
The refraction value is obtained by performing the same calculation as in the case where the light is received at once without decentering. However, it is performed eccentrically in one direction at the time of cloudiness for diopter guidance. As shown in FIG. 3 (b) without the influence of the eyelashes, diopter guidance is performed by preliminary measurement in a state of being eccentric downward, and in this measurement, measurement is performed while changing the eccentric direction as described above.

【００１６】このように、円周状に偏芯しながら測定す
ることにより、瞳孔Ｐ内の平均的な屈折力が測定できる
ので、小瞳孔に限らず大きな瞳孔の眼や瞳孔の一部分に
混濁を有する被検眼Ｅにも、このような測定を行うこと
ができる。As described above, the average refractive power in the pupil P can be measured by measuring while eccentrically circumferentially, so that not only the small pupil but also the eyes of a large pupil or a part of the pupil may be clouded. Such measurement can also be performed on the eye E to be examined.

【００１７】アライメント時に瞳孔Ｐの位置と共に大き
さを認識し、測定光束よりも小さい場合は、自動的に上
述の偏芯測定をするようにプログラムしておいてもよ
い。上述の説明では、瞳孔Ｐの中心から投影し、その周
囲から受光する形態としたが、その逆に周辺から投影し
中心から受光する形態でも同様である。また、リング光
束は３経線方向に配置した６つの光束によってもよい。At the time of alignment, the size of the pupil P is recognized together with the position of the pupil P, and when the pupil P is smaller than the measurement light flux, the above-described eccentricity measurement may be automatically programmed. In the above description, the projection is performed from the center of the pupil P and the light is received from the periphery. However, the same applies to the configuration in which the projection is performed from the periphery and the light is received from the center. Further, the ring light beam may be six light beams arranged in three meridian directions.

【００１８】図５、図６、図７は第２の実施の形態を示
している。これらの実施の形態は共に第１の実施の形態
のように、測定部を駆動する駆動手段３と前眼部を撮像
する撮像手段１８を備えている。FIGS. 5, 6, and 7 show a second embodiment. Each of these embodiments includes a driving unit 3 for driving the measuring unit and an imaging unit 18 for imaging the anterior segment as in the first embodiment.

【００１９】図５は通常測定時の瞳孔Ｐ上の測定光束を
示し、測定光軸Ｏ１を瞳孔Ｐの中心に合わせる。２個の
ＬＥＤによる投影光束Ｌｅ、Ｌｆは瞳孔Ｐの両側周辺か
ら交互に投影し、受光光束Ｌｇは瞳孔Ｐの中心から取り
出し、図６に示す２分割光電センサ３１、３２上に受光
光束Ｌｈを受光する。光電センサ３１、３２の差信号を
検出し、その差が無くなるようにフォーカスを変えてゆ
く過程で、眼底と光電センサ３１、３２とが共役になる
と差が無くなるので、そのフォーカス位置を基に視度を
測定する。FIG. 5 shows a measurement light beam on the pupil P during normal measurement, and the measurement optical axis O1 is aligned with the center of the pupil P. The projection light beams Le and Lf by the two LEDs are projected alternately from both sides of the pupil P, the received light beam Lg is taken out from the center of the pupil P, and the received light beam Lh is put on the two-part photoelectric sensors 31 and 32 shown in FIG. Receive light. In the process of detecting the difference signal between the photoelectric sensors 31 and 32 and changing the focus so as to eliminate the difference, when the fundus and the photoelectric sensors 31 and 32 become conjugate, the difference disappears. Measure the degree.

【００２０】この場合に、投影光束Ｌｅ、Ｌｆを光軸Ｏ
１の周りに１８０度回転するように、測定系の一部を回
動しながらフォーカスを変え、各経線の屈折力を測定し
乱視を求める。In this case, the projection light beams Le and Lf are shifted along the optical axis O.
The focus is changed while rotating a part of the measurement system so as to rotate 180 degrees around 1, and the astigmatism is obtained by measuring the refractive power of each meridian.

【００２１】図７は小瞳孔眼の測定時の瞳孔Ｐと測定光
束を示す。投影光束Ｌｅを照明するＬＥＤを連続点灯
し、投影光束Ｌｆを照明する測定光源１１を消灯する。
光電センサ３１、３２の出力の差が無くなるように、光
軸方向に測定系部材を動かしてフォーカスするのは通常
の測定と同様である。測定部１は駆動手段３により光軸
Ｏ１が半円Ｑを描くように駆動する。同時に、各経線の
屈折力を測定するために、測定系の一部を測定光軸Ｏ１
を中心として測定部１と同期して１８０度回動する。FIG. 7 shows a pupil P and a measurement light beam when measuring a small pupil eye. The LED that illuminates the projection light beam Le is continuously turned on, and the measurement light source 11 that illuminates the projection light beam Lf is turned off.
Movement of the measurement system member in the optical axis direction to focus so as to eliminate the difference between the outputs of the photoelectric sensors 31 and 32 is the same as in normal measurement. The measuring unit 1 is driven by the driving unit 3 so that the optical axis O1 draws a semicircle Q. At the same time, in order to measure the refractive power of each meridian, a part of the measurement system is set to the measurement optical axis O1
, And rotates 180 degrees in synchronization with the measuring unit 1.

【００２２】図８、図９、図１０は第３の実施の形態
で、検影法の原理による測定系のオートレフラクトメー
タの例で示している。図８は瞳孔Ｐ上の投影光束Ｌｉを
示し、矢印の方向にスリット状の投影光束Ｌｉが瞳孔Ｐ
を横切るように動き、その眼底反射光を瞳孔Ｐと共役位
置にある光電センサ３３、３４、３５により検出する。FIGS. 8, 9 and 10 show a third embodiment, which is an example of an auto-refractometer of a measuring system based on the principle of a radiographic method. FIG. 8 shows the projection light beam Li on the pupil P, and the slit-shaped projection light beam Li
, And the reflected light from the fundus is detected by the photoelectric sensors 33, 34, 35 located at positions conjugate with the pupil P.

【００２３】図９は正視眼底からの光電センサ３３、３
４、３５上の反射光を示している。正視の場合には、瞳
孔Ｐは投影光束の位置に拘わらず一様に明るくなる。屈
折異常があると、瞳孔Ｐでの明るさに分布が生じ、その
分布は光束Ｌｉの位置で変化するので、この分布を検出
して屈折力を求める。乱視を測定するには、ロータリプ
リズム等により光軸Ｏ１を中心として測定光束を１８０
度回転する。通常の測定には、瞳孔Ｐの周囲の２個所の
センサ３３、３５で足りる。小瞳孔眼を測定するため
に、光軸Ｏ１上に更に１つの光電センサ３４を設けられ
ているが、通常の測定時にはこの光電センサ３４は使わ
なくともよい。FIG. 9 shows photoelectric sensors 33, 3 from the fundus of the standard eye.
4, the reflected light on 35 is shown. In the case of normal vision, the pupil P becomes uniformly bright regardless of the position of the projection light beam. If there is a refraction abnormality, a distribution occurs in the brightness at the pupil P, and the distribution changes at the position of the light beam Li. Therefore, the distribution is detected to determine the refracting power. In order to measure astigmatism, the measurement light flux is shifted 180 degrees around the optical axis O1 by a rotary prism or the like.
Rotate degrees. For normal measurement, two sensors 33 and 35 around the pupil P are sufficient. In order to measure the small pupil eye, one more photoelectric sensor 34 is provided on the optical axis O1, but this photoelectric sensor 34 does not have to be used during normal measurement.

【００２４】図１０は小瞳孔の測定時の測定光束を示
す。瞳孔像が光電センサ３３、３４に掛かるように偏芯
させ、光電センサ３５の信号は使用しない。測定部１を
駆動手段３で瞳孔上で半円Ｒを描くように駆動する。そ
の動きに同期して、測定光束を光軸Ｏ１を中心として１
８０度回転する。光電センサ３３、３４により瞳孔Ｐ上
の反射光強度分布を検出し屈折値を求める。小瞳孔の測
定時には、虹彩からの反射を遮光する瞳孔程度の大きさ
の絞りを、瞳孔Ｐの共役位置に光軸Ｏ１に偏芯して挿入
することが望ましい。FIG. 10 shows a measurement light beam when the small pupil is measured. The pupil image is decentered so as to be applied to the photoelectric sensors 33 and 34, and the signal of the photoelectric sensor 35 is not used. The measuring unit 1 is driven by the driving means 3 so as to draw a semicircle R on the pupil. In synchronization with the movement, the measurement light flux is shifted by 1 around the optical axis O1.
Rotate 80 degrees. The reflected light intensity distribution on the pupil P is detected by the photoelectric sensors 33 and 34 to determine a refraction value. At the time of measurement of the small pupil, it is desirable to insert an iris having a size about the pupil that blocks reflection from the iris, eccentrically to the optical axis O1 at the conjugate position of the pupil P.

【００２５】なお、従来の装置では、光軸中心にはアラ
イメント用の光電センサが設けられているが、これを小
瞳孔眼屈折測定に兼用してもよい。In the conventional apparatus, a photoelectric sensor for alignment is provided at the center of the optical axis. However, this may be used also for measurement of small pupil eye refraction.

【００２６】[0026]

【発明の効果】以上説明したように本発明に係るオート
レフラクトメータは、小瞳孔眼を容易にかつ確実に屈折
測定できる。As described above, the auto-refractometer according to the present invention can easily and reliably measure the refraction of the small pupil eye.

【００２７】また、本発明に係るオートフラクトメータ
は、撮像素子画面の座標位置を使用せずに、屈折値の演
算ができるので精度の良く小瞳孔眼の屈折測定ができ
る。Further, the autofractometer according to the present invention can calculate the refraction value without using the coordinate position of the image sensor screen, so that the refraction of the small pupil eye can be measured with high accuracy.

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

【図１】第１の実施形態のオートレフラクトメータの構
成図である。FIG. 1 is a configuration diagram of an auto-refractometer according to a first embodiment.

【図２】瞳孔上の光軸の軌跡の説明図である。FIG. 2 is an explanatory diagram of a locus of an optical axis on a pupil.

【図３】瞳孔と測定光束の関係図である。FIG. 3 is a relationship diagram between a pupil and a measurement light beam.

【図４】光電センサ上の受光光束の説明図である。FIG. 4 is an explanatory diagram of a received light beam on a photoelectric sensor.

【図５】第２の実施形態の瞳孔上の測定光束の説明図で
ある。FIG. 5 is an explanatory diagram of a measurement light beam on a pupil according to the second embodiment.

【図６】光電センサ上の受光光束の説明図である。FIG. 6 is an explanatory diagram of a received light beam on a photoelectric sensor.

【図７】小瞳孔と測定光束の説明図である。FIG. 7 is an explanatory diagram of a small pupil and a measurement light beam.

【図８】第３の実施形態の瞳孔上の測定光束の説明図で
ある。FIG. 8 is an explanatory diagram of a measurement light beam on a pupil according to the third embodiment.

【図９】光電センサ上の受光光束の説明図である。FIG. 9 is an explanatory diagram of a received light beam on a photoelectric sensor.

【図１０】小瞳孔眼の光電センサ上の受光光束の説明図
である。FIG. 10 is an explanatory diagram of a light beam received on a photoelectric sensor of a small pupil eye.

【符号の説明】[Explanation of symbols]

１ 測定部 ３ 駆動手段 １１ 測定光源 １８ 撮像手段 ２２、３１、３２、３３、３４、３５ 光電センサ ２３ 演算制御手段 ２４ テレビモニタ DESCRIPTION OF SYMBOLS 1 Measuring part 3 Driving means 11 Measurement light source 18 Imaging means 22, 31, 32, 33, 34, 35 Photoelectric sensor 23 Operation control means 24 Television monitor

Claims (3)

【特許請求の範囲】[Claims] 【請求項１】 眼底に光束を投影し反射光を検出し眼屈
折測定をするオートレフラクトメータにおいて、測定光
学系をアライメント駆動する駆動手段により測定光学系
の光軸が瞳孔中心の周りを回るように駆動しながら検出
した信号により、乱視を合む眼屈折測定をすることを特
徴とするオートレフラクトメータ。1. An auto-refractometer for projecting a light beam onto a fundus and detecting reflected light to measure an eye refraction, wherein a driving means for driving the alignment of the measuring optical system causes the optical axis of the measuring optical system to rotate around the center of the pupil. An auto-refractometer, which measures an eye refraction for astigmatism based on a signal detected while being driven. 【請求項２】 瞳孔と共役位置に設け光軸中心と周辺で
光束を分割する光分割部材と、該光分割部材を介して眼
底に光束を投影する投影系と眼底反射光を撮像素子で受
光する受光系とを含む測定光学系と、該測定光学系をア
ライメント駆動する駆動手段と、該駆動手段により前記
測定光学系をその光軸が瞳孔中心の周囲を移動しながら
前記撮像素子で受光した信号により屈折測定をすること
を特徴とするオートレフラクトメータ。2. A light splitting member provided at a position conjugate to the pupil and splitting a light flux at the center and periphery of the optical axis, a projection system for projecting a light flux onto the fundus via the light splitting member, and a fundus reflected light received by an image sensor. A measuring optical system including a light receiving system for performing the measurement, a driving unit that drives the alignment of the measuring optical system, and the driving unit receives the measuring optical system with the image sensor while its optical axis moves around the center of the pupil. An auto-refractometer that performs refraction measurement using a signal. 【請求項３】 前眼部像から瞳孔径を求め、該瞳孔径に
応じて瞳孔中心と測定光軸での偏芯量を変える請求項１
又は２に記載のオートレフラクトメータ。3. The pupil diameter is determined from the anterior eye image, and the eccentric amount between the pupil center and the measurement optical axis is changed according to the pupil diameter.
Or the auto-refractometer according to 2.