MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY
Cataract surgery. Surgical tools being used to remove the lens from the eye of a patient with a cataract. A set of retractors have been used to keep the patient's eyelids drawn back. A cataract is an abnormal cloudy and opaque area that can form in the lens of an eye. The condition will lead to blindness unless it is treated. A cataract operation involves cutting the cornea (at the front of the eye), removing the cloudy lens, and replacing it with a plastic fixed-focus lens.
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