For neovascularizations as part of diabetic retinopathy (proliferative diabetic retinopathy), panretinal laser coagulation (grid-pattern laser treatment of the deep retinal layers of the entire retina) is the preferred treatment method. The laser treatment is performed in several (usually 4) individual sessions with dilated pupils using a contact lens, at weekly intervals. Laser coagulation of the retina can also prevent the progression of the disease and blindness in cases of retinal vascular occlusions with (impending) neovascularizations (e.g., ischemic central retinal vein occlusion), or neovascularizations of the iris (rubeosis iridis).