Electronic ophthalmoscope for selective retinal photodisruption of the photoreceptor mosaic
View Patent ↗An electronic ophthalmoscope combining scanning laser (SLO) and optical coherence (OCT) technologies is further equipped with a pulsed laser source in the femtosecond (fs) range. The goal is primarily to selectively disrupt the photoreceptor mosaic of the retina or Bruch's membrane in a pattern that minimizes loss of visual functioning, and to reduce thereby the metabolic load of the outer retina. Using a beam splitter, one embodiment combines the SLO scanning beams with the therapeutic laser beam and aiming beam. The therapeutic channel uses an independent x/y positioner and micro-deflector. Because the duty cycle is appropriate, a second embodiment can use the SLO scanners to also scan a modulated therapeutic laser beam. A biometric OCT probe, helpful in focusing, can be integrated in both configurations. A method is also disclosed to represent the tilting of the retina at a specified location.
1. A method for representing the directionality of the retina of an eye at the foveal location of said eye, comprising the steps of:
A. centering an optical coherence tomograph along an axis of said eye, said axis connecting the fixation location of said retina to the center of the pupil of said eye;
B. obtaining a set of optical coherence tomography sections in said eye of said retina at said foveal location; said set of sections showing at least one reference layer selected from the group of retinal pigment epithelium layer, outer limiting membrane layer or junctional complex layer in the neighborhood of said foveal location;
C. geometrically determining the slope of a tangent plane to said reference layer at said foveal location;
D. geometrically constructing a normal line to said tangent plane at said foveal location;
E. determining the intersection of said normal line with the plane containing said pupil of said eye;
F. representing the location of said intersection numerically as a set of coordinates relative to the center of said pupil of said eye;
thereby indicating the inclination of said retina at said foveal location in the pupillary plane.