DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Eye after cataract surgery. Close-up of the eye of an 82-year-old female patient 10 days after surgery to replace the lens affected by a cataract. A cataract is a clouding of the eye's lens caused by medication, disease, drug abuse, injury, or most often aging. They are the most common cause of vision loss in the world. During cataract surgery, the affected lens is removed and replaced with a synthetic one.
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