Non-contact type tonometer

Details Non-contact type tonometer Non-contact type tonometer

1986-02-25

1987-11-10

Coven, Edward M.

Surgery

Truss

Pad

A61B 316

Patent

active

047050454

ABSTRACT:
There is disclosed a non-contact type tonometer for measuring intraocular pressure of an eye under test in which a fluid for deforming a cornea, discharged along an optical axis of an alignment optical system toward the cornea in order to deform the cornea. The intraocular pressure is measured based on the measured deformation of the cornea. The alignment optical system comprises a projection optical system which is independently adapted for projecting a pair of target rays for alignment verification toward the cornea; and an alignment verification optical system in which corneal specular reflection rays of the pair of target rays are guided to the objective lens as if the pair of target rays were radiated from the corneal focal point. When an optical axis of the projection optical system is made coincident with the focal point of the cornea and the reflected target images are formed by the objective lens, alignment verification is effected based on duplication of the pair of target images.

REFERENCES:
patent: 3756073 (1973-09-01), Lavallee et al.
patent: 3832890 (1974-09-01), Grolman et al.
patent: 4154532 (1979-05-01), Emmerich

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