Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1988-06-29
1990-02-20
Dzierzynski, P. M.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
356 2, A61B 310
Patent
active
049021222
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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Azema Alain
Botineau Jean
Moulin Gerard
Dzierzynski P. M.
Synthelabo
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