The authors made photopic ERG examinations according to the international standard in 82 diabetic patients. They recorded a significant reduction of ampli- tudes of the b wave in a group of 38 patients who at the time of the examination did not have yet any pathological changes on the fundus. Regressive analysis did not prove after laser photocoagulation in these patients, contrary to a control groupanddiabetic patients withsimple diabetic retinopathy, any correlation between the patients age and the extent of the retinal response. Photopic electroretinograms must be included in the electrophysiological dia- gnostic arsenal in diabetes.

        Key words: diabetes mellitus, photopic electroretinography