PERFORMANCE-MEASUREMENTS OF AN INFRARED DIGITAL SCANNING LASER OPHTHALMOSCOPE

Direct digital acquisition of images using a scanning laser ophthalmos cope (SLO) offers several advantages over the conventional fundus came ra; in particular, the ability to produce tomographic images using a c onfocal aperture. This note describes measurements of the performance of an SLO. Spatial resolution, measured by the modulation transfer fun ction, MTF, was shown to be worse along the direction of scan. As expe cted, image uniformity was good, with a coefficient of variation of 1. 9%. While the effect of using a 100 mu m diameter confocal aperture in stead of one with a 400 mu m diameter was to reduce slice thickness fr om 2600 mu m to 975 mu m, image intensity was reduced by a factor of 3 0.