Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1992-09-16
1994-10-04
Bertsch, Richard A.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
356376, A61B 310, G01B 1124
Patent
active
053530730
ABSTRACT:
A three-dimensional shape measurement system produces three-dimensional information of an object, such as an eye fundus, by directing light onto the object, receiving the light reflected from the object, photoelectrically converting the received light and processing the electric signal. The system includes laser beam control circuitry for focal point shifting in the direction of the optical axis, and a pair of detectors for detecting variation in the focal position of the light reflected from the object and deriving information respecting the shape of the object in the direction of the optical axis. Signal processing circuitry drives the laser beam control circuitry to produce a focused condition and adjusts the output signals of the detectors to a prescribed state.
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Adams Bruce L.
Bertsch Richard A.
Kowa Company Ltd.
Richman Howard R.
Wilks Van C.
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