Surgery – Diagnostic testing – Testing aqueous humor pressure or related condition
Patent
1994-02-22
1998-09-29
Lacyk, John P.
Surgery
Diagnostic testing
Testing aqueous humor pressure or related condition
600474, 600549, A61B 316, A61B 600
Patent
active
058139826
ABSTRACT:
Medical studies have shown that when the pressure within the eye rises above normal the flow of blood is suppressed to the veins and the optic nerve fibers causing a reduction of temperature at those locations. If such conditions are allowed to exist over a period of time the subject is in danger of experiencing loss of peripheral vision, called glaucoma.
This invention presents an improved way to determine indirectly intra-ocular pressure of the human eye through the use of a noncontacting, nonirrating, infrared temperature sensing device. This is accomplished by accurately measuring the temperature at the macula and fovea sites located at the back of the eye and the core body temperature as the individual's base temperature using the same tympanic temperature measuring device. The difference in these temperatures, calibrated in terms of intra-ocular pressure, reveals the potential danger of impending glaucoma. The read-out can easily be put in terms of a threshold warning to the user as a visual and/or audible warning signal. The device can be employed as an accurate tonometer to replace the presently used mechanical tonometers, or as a screening test.
REFERENCES:
patent: 4626686 (1986-12-01), Pompei et al.
patent: 4797840 (1989-01-01), Fraden
patent: 5199436 (1993-04-01), Pompei et al.
Lacyk John P.
Marshall Jeffrey D.
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