Low vision, or partial sight, is a visual condition that cannot be corrected by conventional eyeglasses or contact lenses. A variety of disorders that affect the eye, most age-related, may cause low vision. Some of these conditions include: Macular Degeneration, Diabetic Retinopathy, glaucoma and retinitis Pigmentosa. Low Vision is the third most commonly occurring physical impairment in those over 65, exceeded only by heart disease and arthritis.