Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1997-05-09
1998-11-10
Manuel, George
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
A61B 300
Patent
active
058351892
ABSTRACT:
In order to determine the prospective long term improvement to a diseased eye obtained by performing a treatment such as retinal laser surgery, the diameters of the four major arteriole blood vessels are measured, preferably digitally, and summed before the treatment at positions substantially equidistant from the center of the region where they converge and enter the optic nerve head. After the eye heals, the diameters of the blood vessels are digitally remeasured, and the degree of reduction of the second value with respect to the first value is determined. The reduction is compared to a predetermined reduction range (as obtained, for example, from a computer database of known results) which is representative of known degrees of long term improvement to obtain an indication of the expected long term results of the subject eye and the adequacy of the treatment. The same procedure may be employed to predict the results of medical or surgical retinal interventions other than retinal laser surgery, and a similar procedure may be employed to help establish the suitability of medical or surgical retinal interventions, including laser surgery, on a given eye by comparing the retinal blood vessel measurements taken before any such intervention to corresponding measurements of a reference eye (e.g., a normal eye) and applying a maximum acceptable difference between the two.
REFERENCES:
patent: 5137029 (1992-08-01), Parra
patent: 5220360 (1993-06-01), Verdooner et al.
Quigley Michael G.
Rosen Howard B.
Manuel George
Phillips James H.
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