DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Cataract surgery. Close-up of a surgeon's hands operating to remove a cataract from a patient's eye. A cataract is a loss of transparency of the lens of the eye. It is extremely common in old age, causing a gradual loss of visual acuity (sharpness) and increasing short-sightedness. The surgeon will remove the abnormal lens and replace it with a prosthetic one.
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