Retinopathy Stages Detection using Circular Hough Transformation

Diabetic retinopathy is progressive disease that leads patients to blindness. Diabetic retinopathy is classified into two main stages, namely non-proliferative diabetes retinopathy (NPDR) and proliferative diabetes retinopathy (PDR). In realism, there is not much difference in risk between diabetic eyes with normal eye and those having mild retinopathy. Both have a very low risk of progressing to PDR; in fact, the Early Treatment of Diabetic Retinopathy Study is necessary so that ophthalmologist can avoid severe stage. In this research used Circular Hough-Transformation method in which we find that sensitivity 89.25%, specificity 97.46 and accuracy 96.62% .It is found that the rate of progression to PDR after four years was less than 1% for both young and older patients with no diabetic retinopathy, compared to 4.1% in younger patients with a rare microaneurysm and hemorrhage.