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Proceedings Paper

New Scleral Lens For Electroretinography
Author(s): J. R. Charlier; Y. Grall; J. F. Legargasson
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Paper Abstract

This paper presents a scleral lens specifically designed for the implementation of new electroretinography (E.R.G.) procedures including ganzeld ERG, pattern ERG and optic fiber ERG. Ganzfeld ERG requires a direct, uniform illumination of the retina and is usually obtained within a ball stimulation which provides precisely controlled stimulation conditions. Pattern ERG is related to the electrical activity of ganglion cells and is produced by a structured visual stimulus, for instance a cherkerboard reversal. Fiber optics stimulation is a promising new technique involving an optic fiber which connects the scleral lens to a remote light stimulator. The new scleral lens is made out of silicon. Silicon is an ideal material for ERG applications. It is highly permeable to oxygen. It eliminates the risk of corneal abrasion and it provides good comfort to the patient. Two layers of conductive silicon are used for recording the bioelectric potential difference of the cornea with respect to the eye lids. An optically transparent window allows for the projection of structured images on the retina. A wide angle conic aperture is provided for ganzfeld stimulation. The same cone is used as a blepharostat and as a plug for connecting the optic fiber, once the transparent window is centered with respect to the pupil entrance.

Paper Details

Date Published: 9 May 1986
PDF: 5 pages
Proc. SPIE 0601, Ophthalmic Optics, (9 May 1986); doi: 10.1117/12.952460
Show Author Affiliations
J. R. Charlier, Essilor International (France)
U279 INSERM (France)
Y. Grall, Hopital Lariboisiere (France)
J. F. Legargasson, Hopital Lariboisiere (France)

Published in SPIE Proceedings Vol. 0601:
Ophthalmic Optics
Karl H. Guenther, Editor(s)

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