PROBLEM TO BE SOLVED: To highly accurately acquire the three-dimensional shape of the cornea.SOLUTION: This anterior ocular segment measuring instrument includes an instrument body comprising: a first projection optical system that projects outgoing light from a light source to a subjects anterior ocular segment as slit light a first imaging optical system that has an imaging optical axis inclined to the projection optical axis of the first projection optical system, and has a photographic lens and a first imaging element disposed based on Scheimpflug principle and a rotating means that rotates the first projection optical system and the first imaging optical system about a projection optical axis with it used as a center: and measures the anterior ocular segment tissue based on respective anterior ocular segment cross-sectional images captured at a plurality of rotating angles. The anterior ocular segment measuring instrument includes an operation distance detecting means that detects an alignment state of the instrument body with respect to the subjects eye in the operation distance direction.COPYRIGHT: (C)2012,JPO&INPIT【課題】 精度良く角膜の3次元形状を得る。【解決手段】 光源からの出射光を被検眼前眼部にスリット光として投影する第1投影光学系、第1投影光学系の投影光軸に対して傾斜した撮像光軸を持ち、シャインプルークの原理に基づいて配置された撮影レンズと第1撮像素子を持つ第1撮像光学系、第1投影光学系と第1撮像光学系を投影光軸を中心にその軸回りに回転させる回転手段、を持つ装置本体を備え、複数の回転角度にて撮影された各前眼部断面画像に基づいて前眼部組織を測定する前眼部測定装置において、被検眼に対する装置本体の作動距離方向におけるアライメント状態を検出する作動距離検出手段を備える。【選択図】 図2
