Noncontact type tonometer

Details Noncontact type tonometer Noncontact type tonometer

1991-09-12

1992-04-07

Cohen, Lee S.

Surgery

Truss

Pad

351208, A61B 316

Patent

active

051018268

ABSTRACT:
A noncontact type tonometer has a nozzle for discharging fluid toward an eye to be tested, an alignment target projecting optical system for projecting an alignment target light used for aligning the eye and an apparatus body toward the center of curvature of the cornea of the eye from the axial direction of said nozzle while converging the same thereto by an objective lens and forming a virtual image at the center of curvature of the cornea, and an alignment light receiving optical system for reimaging the virtual image on a light receiving portion as a target image. The improvement is characterized in that the alignment light receiving optical system is provided with a light splitter adapted to split an alignment target light for forming the virtual image based on specular reflection of the cornea and guiding the same to the light receiving portion in order to verify the alignment with reference to coincidence or noncoincidence of the alignment target image.

REFERENCES:
patent: 3756073 (1973-09-01), Lavallee et al.
patent: 4665923 (1987-05-01), Kobayashi

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