Digital fundus imaging using a scanning laser ophthalmoscope

Abstract

The authors describe the construction of a scanning laser ophthalmoscope interfaced to a computer, which has a number of significant advantages for digital retinal imaging. First, it has better uniformity of illumination than the fundus camera and operates at much lower light levels. Secondly, it permits imaging at various wavelengths with no consequent degradation in image quality; in particular, the value of imaging at infrared wavelengths to give greater tissue penetration is demonstrated. Finally, by introducing the capability for confocal imaging, tomographic images can be taken, improving the perceptibility of features situated deep in the retina. Typical images are shown to demonstrate the potential of this instrument.