Optical system for determining the variation of curvature of an object on a zone of small dimensions
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United States of America Patent
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Feb 20, 1990
Grant Date -
N/A
app pub date -
Jun 29, 1988
filing date -
Sep 4, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
This invention relates to an optical system for determining the curvature or the modification of curvature of an object on a zone of small dimensions, wherein it comprises: a light source; first optics adapted to form a parallel light beam from the beam emitted by said source; a semireflecting element disposed on the path of said parallel beam; second focussing optics receiving the parallel beam reflected by said element and being capable of moving parallel to the direction of propagation of said light beam, so that their image focus merges with the center of curvature or the surface of said object; third focussing optics receiving the beam reflected by the object, and means for detecting the image formed by said system. The invention is more particularly applicable in keratometry.
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