The aim of study was the development of a diagnostic device for the determination and analysis of the optic densities of various lenticular laminae on the basis of computer-aided system for analysis of TV images (CASATI). The potentialities of the developed system were evaluated in examinations of 57 diabetics, aged 27 to 78, with opacities beneath the posterior capsule and in the cortical layers of the lens. The reference group consisted of 48 normal subjects without noticeable lens opacities, aged 23 to 76. Comparative densitometry of the lens was carried out in the same patients by reproductive microdensitometry and CASATI. The new method permitted an objective assessment of the optic densities of various layers of the lens and may be used to predict the development of opacities therein. Another possible application of this method is the assessment of the conjunctival vessels status and prediction of the course of various diseases and monitoring the efficacy of therapy thereof.