SPENCER SUTTON / SCIENCE PHOTO LIBRARY SPENCER SUTTON / SCIENCE PHOTO LIBRARY
Scene as it would appear to a patient with cataracts. A cataract is a clouding of the lens of the eye, making it opaque. It causes the patient's sight to become blurred and yellowed, and if left untreated will obscure the vision completely. Cataracts can be caused by diabetes or prolonged exposure to ultraviolet light, but also may be due simply to old age. It is treated by surgically removing the cloudy lens and replacing it with a plastic one. For a view of the same scene from the perspective of a patient with normal vision, see image BU5147.
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