Non-contact high frequency tonometer

Details Non-contact high frequency tonometer Non-contact high frequency tonometer

1988-09-28

1990-05-29

Kamm, William E.

Surgery

Truss

Pad

12866002, A61B 316

Patent

active

049286978

ABSTRACT:
A non-contact tonometer for use in the measurement of intraocular pressure in the diagnosis of glaucoma utilizes low frequency sound to perturb a given corneal area. High frequency sound waves are directed toward the perturbed corneal area and reflected therefrom. The output signals created by amplitude modulation of the the reflected sound waves are directly related to the intraocular pressure. The tonometer eliminates the need for physical contact with the eye, topical anesthetization and has no audible sound with no visible light or other sensory impacts on the eye.

REFERENCES:
patent: 3763696 (1973-10-01), Krakau
patent: 3948248 (1976-04-01), Zuckerman et al.
patent: 4610255 (1986-09-01), Shimura et al.
patent: 4819649 (1989-04-01), Rogers et al.

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