Eye refractometer having a viewing target projecting system
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United States of America Patent
Stats
-
Dec 8, 1981
Grant Date -
N/A
app pub date -
May 15, 1980
filing date -
May 21, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An eye refractometer including a measuring target projecting optical system for projecting a measuring target to a patient's eye using an infrared ray. A viewing target is provided in the projecting system and located more distant from the patient's eye than the measuring target. A filter is located between the two targets and has a portion which is transparent to visible light and corresponds to the viewing target. The remainder of the filter is opaque to the visible light but transparent to infrared ray. The two targets and the filter are assembled together so that they are moved as a unit.
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Cited Art Landscape
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