Air puff type tonometer

Details Air puff type tonometer Air puff type tonometer

1988-10-13

1991-08-27

Cohen, Lee S.

Surgery

Truss

Pad

128645, 128652, A61B 316

Patent

active

050424840

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.

REFERENCES:
patent: 3783247 (1974-01-01), Klein
patent: 4131113 (1978-12-01), Fender et al.
patent: 4164863 (1979-08-01), Ragsdale
patent: 4747296 (1988-05-01), Feldon et al.
patent: 4817620 (1989-04-01), Katsuragi
patent: 4827191 (1989-05-01), Chapman
patent: 4834105 (1989-05-01), Mathews et al.

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