Noncontact type tonometer

Details Noncontact type tonometer Noncontact type tonometer

1988-06-29

1992-03-03

Howell, Kyle L.

Surgery

Truss

Pad

A61B 316

Patent

active

050923340

ABSTRACT:
A noncontact type tonometer projects a fluid toward an eye-to-be-tested and obtains a measured value of eye pressure from a relation between transfigurations of the eye due to the fluid projection and the pressure projecting of the fluid. A detecting circuit senses a pulse wave of the person-to-be-tested and a calculating circuit determines at least one of the maximum eye pressure value, minimum eye pressure value and average pressure value of the eye dependent on the maximum fluctuation width of the detected pulse wave, a fluctuating quantity of the detected pulse wave, and the measured eye pressure value. The calculation circuit determines the pulse wave fluctuating quantity at the time point when the eye pressure is measured. The pulse wave of the person may be measured at a position remote from the eye. The tonometer may also include a display for displaying the pulse wave and a display controller for displaying the time point when the eye pressure is measured. The displayed eye pressure overlaps the displayed pulse wave to illustrate the relation between the measured eye pressure value and the pulse wave fluctuation.

REFERENCES:
patent: 3572100 (1971-03-01), Grolman
patent: 4799489 (1989-01-01), Hideshima
patent: 4817620 (1989-04-01), Katsuragi et al.

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