Air puff type tonometer
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United States of America Patent
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-
Aug 27, 1991
Grant Date -
N/A
app pub date -
Oct 13, 1988
filing date -
Oct 13, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An air puff type tonometer having a source for projecting a light beam toward the cornea of an eye to be tested, an alignment sensor for receiving the light beam after reflection from the cornea and providing a corresponding received light signal, a device for detecting optical alignment based on the received light signal, a device for directing an air puff, a device for providing an applanation signal corresponding to the applanation state of the cornea when the cornea is applanated by an air puff upon the cornea, an A/D converter for converting the applanation signal in accordance with a preset comparison reference value, and a device for setting the comparison reference value based on quantity of light received by the alignment sensor.
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