The sensory membrane that lines the inner surface of the back of the eyeball is called the retina.photoreceptors are composed of several layers ,including the specialized cells. Due various Disease like Diabetes , Hypertension and other causes Retina suffers abnormal changes which leads to vision loss to Blindness. India is hub of Diabetics and it is one of main cause of Retinopathy
Most cataracts develop slowly and don't disturb your eyesight early on. But with time, cataracts will eventually interfere with your vision.
At first, stronger lighting and eyeglasses can help you deal with cataracts. But if impaired vision interferes with your usual activities, you might need cataract surgery. Fortunately, cataract surgery is generally a safe, effective procedure.