Duel mode non-contact tonometer

Details Duel mode non-contact tonometer Duel mode non-contact tonometer

2005-04-05

2005-04-05

Winakur, Eric F. (Department: 3736)

Surgery

Diagnostic testing

Testing aqueous humor pressure or related condition

Reexamination Certificate

active

06875175

ABSTRACT:
A dual mode non-contact tonometer allows selection between a standard measurement mode for patient comfort and an alternate measurement mode wherein pressure-time characteristics of the fluid pulse are varied to allow additional observation of corneal hysteresis associated with the dynamic measurement process. In the alternate measurement mode, measured intraocular pressure corresponding to inward applanation of the cornea and corneal hysteresis derived from a pressure differential associated with inward and outward applanation events in the same measurement pulse allows comparison with a predetermined population normality function to avoid corneal effects so that the actual status of intraocular pressure can be ascertained.

REFERENCES:
patent: 5279300 (1994-01-01), Miwa et al.
patent: 5474066 (1995-12-01), Grolman
patent: 6159148 (2000-12-01), Luce
patent: 6419631 (2002-07-01), Luce
patent: 6616609 (2003-09-01), Siskowski et al.

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