Panretinal photocoagulation (PRP) is a procedure used to prevent the growth of abnormal blood vessels and glaucoma (damage to optic nerve) in patients with retinal vein occlusion. PRP is an out-patient procedure, usually performed under topical anesthesia, which numbs only your eye. The procedure usually takes between 30 to 45 minutes per session; however, you may require up to 3 or 4 different sessions Panretinal photocoagulation can help prevent further worsening of your vision; however, regular comprehensive eye checkups are very important to keep the disease under control.