Noncontact type tonometer

Details Noncontact type tonometer Noncontact type tonometer

1990-08-21

1991-08-27

Shay, Randy C.

Surgery

Truss

Pad

128652, A61B 316

Patent

active

050424831

ABSTRACT:
In a noncontact type tonometer including an air puff system for discharging fluid toward the cornea of an eye to be tested upon receipt of a projection signal and a pulse wave system for detecting the pulse of a patient which outputs an alternating voltage, the improvement comprising zero level detection system for detecting a zero level of the alternating voltage; and a timer which starts counting when the zero level has been detected by the zero detection systems and which outputs a projection signal to actuate the air puff system when the counted value has reached a preset time.

REFERENCES:
patent: 4172447 (1979-10-01), Bencze et al.
patent: 4872460 (1989-10-01), Nishio et al.

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