Photography of ocular lesions is particularly helpful in documenting different lesions. It helps in various ways: allowing comparison at follow-up visits for potentially changing lesions –nevus, tumors, diabetic retinopathy, hemorrhages from vein occlusions, retinal swelling from arterial occlusion, optic nerve changes (edema, hemorrhages, glaucomatous cupping), retinal damage from trauma, etc.) Photography is also helpful in educating the patient as to his/her condition. The eye is the only part of the body (conjunctiva and retina) where blood vessels can be seen clearly, photographed and studied as they undergo change in various diseases.