Cataract surgery. Image 2 of 6. Patient undergoing cataract surgery. A scalpel is cutting into the cornea (at the front of the eye) and metal retractors are holding back the eyelids. 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. For a series showing the surgical procedure, see images M570/186 - M570/191.
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