Complications of diabetes will result in Diabetic Retinopathy. The patient will not be aware of the symptoms unless it's too late to carryout treatment. Thus early detection of diabetic retinopathy is very essential to prevent vision loss. Fundus examination is the major method of diagnosis to detect Microvasculature changes, but a visual functional test is an effective alternative to this method which has potential to detect Diabetic retinopathy in early stages. Components of visual function can be characterized in by electrophysiological test of the of the retina.