Objective refractor
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United States of America Patent
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Oct 20, 1992
Grant Date -
N/A
app pub date -
Apr 16, 1990
filing date -
Apr 16, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An objective refractor having no moving parts is disclosed. The refractor, which can be either a hand held or table mounted instrument, includes a reference array and an interrogating array projected onto the eye fundus. The reference array is projected from light sources and the interrogating array is projected to light detectors. Both the reference array and the interrogating array are projected onto the fundus of the eye through preselected spaced apart regions of the eye lens. The movement of the reference array with respect to the interrogating array is observed. By the expedient of making at least two sequential observations utilizing at least three separate regions of the eye lens, the amount of relative pattern displacements can be reduced to a requisite optical prescription for the eye.
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