DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
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Close-up of a 58 year old male patient's eye with a pinguecula, the thickened yellow spot in the centre of the image. It is surrounded by red blood vessels in the white of the eye. A pinguecula is a small, benign, yellowish spot on the conjunctiva (the membrane on the surface of the eye). They are thought to be caused by degenerative changes in the conjunctiva associated with ageing. The yellow colour is caused by build up of elastic fibres. They are most common in the elderly, and are usually harmless but can be removed if unsightly.
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