[Electrical changes in the external retinal layer in the course of diabetic retinopathy (Electroretinographic study)]

An electroretinographic study was undertaken on 27 diabetic subjects, in order to catch the modifications arose in the external retinal layer, that means at the photoreceptor level, in ischaemic conditions. As expected, the parameters of the a wave were significantly modified by the progression of diabetic retinopathy. Cones and rods showed a different response to ischaemia.