Pterygium. Eye of a patient showing an overgrowth on the cornea known as a pterygium. The thickened tissue is seen encroaching on the iris (blue) at centre. It has dragged some small blood vessels with it, which appear to be stretched towards the centre of the eye. The cornea is the bulge over the iris that plays the major role in focusing light onto the retina. If the extension of the cornea threatens the patient's vision, the pterygium should be surgically removed. This condition is most commonly seen in people from dry, hot and dusty climates, and only rarely interferes with vision.
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