Vision testing instrument
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Nov 10, 1981
Grant Date -
N/A
app pub date -
Apr 21, 1980
filing date -
Apr 27, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A vision testing instrument has a projecting optical system for projecting a test chart to produce an aerial image. In the optical system, there is provided a focusing reflector for producing a chart image at a far point. A second focusing reflector is provided so that it can be retractably inserted into the projecting optical path for producing a chart image at a near point.
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Family
International Classification(s)
Cited Art Landscape
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