| 主权项 |
1. Apparatus for generating a three-dimensional topography of a surface of an eye characterized by a distinct visual feature, said apparatus comprising:
A) a camera mounted on a fixed base and directed along an imaging axis for generating a sequence of two-dimensional images of the eye including the distinct visual feature, B) a scanner that generates distance information corresponding to distances from an internal reference of the apparatus to the surface of the eye at a plurality of positions along a meridian scan line during a meridian scanning operation, C) a rotary stage for rotating said scanner to a plurality of angular positions, to thereby also rotate an angular position of the meridian scan line, the rotary stage disposed at a determined physical spacing with respect to the fixed base, to thereby also place the camera at a determined physical spacing with respect to the scanner for each of the plurality of angular positions, and D) a control connected to said camera, said rotary stage and said scanner, said control:
i) configured to control said scanner to produce a plurality of distance measurements along each meridian scan line for a plurality of meridian scanning operations, a corresponding meridian scanning operation performed for each of the plurality of angular positions of the rotary stage,ii) configured to capture a two-dimensional image of the eye generated by the camera simultaneously with each meridian scanning operation, thereby capturing a corresponding two-dimensional image simultaneously with each meridian scan line,iii) configured to store the distance measurements obtained along each meridian scan line and its corresponding two-dimensional image captured during each meridian scanning operation, and E) an image processor configured to process the stored distance measurements and the corresponding simultaneously captured two-dimensional images to thereby align the two-dimensional images to obtain a composite three-dimensional image of the eye corresponding to the three-dimensional topography of the eye surface and thereby compensate for eye motion during the plurality of meridian scanning operations. |
