Alignment apparatus of noncontact type tonometer

Details Alignment apparatus of noncontact type tonometer Alignment apparatus of noncontact type tonometer

1989-04-06

1991-02-26

Green, Randall L.

Surgery

Truss

Pad

128652, 351208, A61B 316

Patent

active

049953931

ABSTRACT:
An alignment apparatus of a noncontact type tonometer has a target projecting system for projecting light emitted from a light emitting source to an eye to be tested along the axial line of a fluid discharging nozzle for discharging fluid and forming a target image on the eye, and an alignment light receiving optical system for receiving the target image along the axial line of the nozzle and forming an image of the target image on a light receiving sensor. The alignment apparatus of a noncontact type tonometer is characterized in that the light emitting source comprises a first and a second light emitting sources, the light receiving sensor comprises an area sensor, and the apparatus further has a control unit adapted to detect the positions of the target images of the first and second light emitting sources formed on the area sensor and to output an alignment completion signal when such detected positions are within a preset range on the area sensor.

REFERENCES:
patent: 3756073 (1973-09-01), Lavallee
patent: 4607922 (1986-08-01), Humphrey
patent: 4817620 (1989-04-01), Katsuragi et al.

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