ANALYSIS OF RETRO-ILLUMINATION PHOTOGRAPHS FOR USE IN LONGITUDINAL-STUDIES OF CATARACT

Retro-illumination photography has potential for the monitoring of cor tical and posterior subcapsular cataract formation. Variations in- the individual illumination results have limited accurate quantification of opacities within such images. We present a new image analysis techn ique which minimises the effect of uneven and varying retro-illuminati on. The new technique has been tested for variation between photograph ers and over a short time period. We believe it is of value in lens as sessment in combination with a semi-quantitative grading system.