CAMPBELL, CHARLES E.,FARRER, STEPHEN W.,NEAL, DANIEL R.,POWERS, WILLIAM S.,RAYMOND, THOMAS D.
申请号：
CA2691658
公开号：
CA2691658C
申请日:
2008.06.27
申请国别(地区):
CA
年份:
2018
代理人:
摘要：
A system measures a cornealtopography of an eye. The system includes a groupof first light sources arranged around a central axis,the group being separated from the axis by aradial distance defining an aperture in the group； aplurality of second light sources； a detector array；and an optical system adapted to provide light fromthe second light sources through the aperture to acornea of an eye, and to provide images of the firstlight sources and images of the second light sourcesfrom the cornea, through the aperture, to thedetector array. The optical system includes anoptical element having a focal length,/ The second lightsources are disposed to be in an optical pathapproximately one focal length,/ away from the opticalelement.
