| 摘要 |
An apparatus ( 10 ) for monitoring the position of an eye during a laser ablation treatment of the eye is provided. The apparatus includes optic means ( 110 ) for directing an incident light beam ( 102 ) along an optical path ( 104 ) onto the external surface of the eye ( 35 ) so as to illuminate a region of said surface that includes a segment of the limbus of the eye, and for directing back along said optical path ( 104 ), a return beam ( 122 ) comprising light of said incident beam scattered by said surface region; beam separation means ( 125 ) for separating the return beam ( 122 ) from the incident beam ( 102 ). The apparatus also includes at least one detector ( 120 ), having one or more detector segments ( 120 a, 120 b), for detecting said return beam ( 122 ), said detector segment(s) ( 120 a, 120 b) recording first and second values for light scattered respectively by the sclera and iris in said illuminated region. Movement of said limbal segment, and therefore of the eye ( 35 ), produces a change in at least one of said first and second values allowing such movement of the eye ( 35 ) to be monitored. A method corresponding to the apparatus is also disclosed.
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