Noncontact tonometer

Details Noncontact tonometer Noncontact tonometer

1998-05-27

1999-11-23

Hindenburg, Max

Surgery

Diagnostic testing

Measuring fluid pressure in body

600399, 600401, 351208, A61B 500

Patent

active

059891955

ABSTRACT:
A noncontact tonometer is provided which is capable of intercepting out-of-axis light of an index beam of light and performing precise alignment. The noncontact tonometer includes an index projecting optical system for projecting an index frontally onto a subject's eye (E) through a nozzle (12) through which gas is also is sprayed upon the eye (E). The index projecting optical system has a projection lens (27) and a diaphragm (23) disposed at a position conjugated to an end surface (F) of the nozzle (12) on the side of the projection lens (27). The diaphragm (23) intercepts rays of light traveling out of an optical axis, and enables precise alignment.

REFERENCES:
patent: 4995393 (1991-02-01), Katsuragi et al.
patent: 5000181 (1991-03-01), Katsuragi
patent: 5033841 (1991-07-01), Nishio et al.
patent: 5101826 (1992-04-01), Katsuragi
patent: 5465123 (1995-11-01), Iijima
patent: 5644375 (1997-07-01), Suzuki
patent: 5696573 (1997-12-01), Miwa
patent: 5708494 (1998-01-01), Iijima et al.
patent: 5776061 (1998-07-01), Hayafuji

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