Retinal imaging by means of light scanning techniques

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Abstract
Application of light scanning techniques to ocular fundus imaging reduces sharply the power density at the subject's retina, while keeping the advantages of TV imaging (25 images per second and video-tape recording). In this new technique, the scanning inherent in TV displays is realized directly on the examined object which is therefore sequentially illuminated point by point. The light scanning ophthalmoscope is mainly characterized by the double crossing of the scanning device. The sharp image of a point source is scanned on the retina and focused back onto a pin-hole. This novel setup makes possible the use of a single large pupil both for illumination and observation thus allowing microscopic retinal examination.

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