Non-contact type tonometer

Details Non-contact type tonometer Non-contact type tonometer

1987-07-20

1990-08-14

Sykes, Angela D.

Surgery

Truss

Pad

128652, A61B 316

Patent

active

049478494

ABSTRACT:
A non-contact type tonometer is disclosed. It has an arrangement for transfiguring a cornea to be tested by discharging a fluid to it. This first arrangement comprises a rotary solenoid, a cylinder, and a rotary solenoid driving circuit. It also has a second arrangement for detecting the physical quantity showing the transfiguration of the cornea. The second arrangement comprises a radiating optical system and a detecting optical system. It also has a circuit serving as a third arrangement for detecting the flow pressure of the fluid which has a correlation with an intraocular pressure. It has a fourth arrangement for establishing a correlation function curve between the physical quantity and the flow pressure of the fluid based on the information from the second and third arrangements, deducing a flow pressure value corresponding to the preset value of the physical quantity from the correlation function curve, and converting such deduced flow pressure value of the fluid to an intraocular pressure value.

REFERENCES:
patent: 3538754 (1970-11-01), Grolman et al.
patent: 3585849 (1971-06-01), Grolman
patent: 3756073 (1973-09-01), Lavallee et al.
patent: 3832890 (1974-09-01), Grolman et al.
patent: 3882718 (1975-05-01), Kriebel
patent: 4523597 (1985-06-01), Sawa et al.
"An Instrument For Self-Measurement of Intraocular Pressure", R. C. Zeimmer & J. T. Wilensky, IEEE Transactions On Biomedical Engineering, vol. BME-29, No. 3, pp. 178-183, Mar. 1982.
"A Non-Contact Applanation Tonometer", Forbes, et al., Archives of Ophthalmology, vol. 91, No. 2, pp. 134-140, Feb. 1974.

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