Refractive errors are a type of vision problem that make it hard to see clearly. They happen when the shape of your eye keeps light from focusing correctly on your retina. Read about the types of refractive errors, their symptoms and causes, and how they are diagnosed and treated.| www.nei.nih.gov
A cataract is a cloudy area in the lens of your eye. More than half of all Americans age 80 and older either have had cataracts or have had surgery to get rid of cataracts. Learn about the types, symptoms, and causes of cataracts and how your doctor will diagnose and treat them.| www.nei.nih.gov