Corneal Disease (cont.) IN THIS ARTICLE Part 3: Corneal
Dystrophies Pterygium. A pterygium is a pinkish, triangular-
shaped tissue growth on the cornea. Some pterygia grow slowly
throughout a person's life, while others stop growing after a
certain point. A pterygium rarely grows so large that it begins
to cover the pupil of the eye. Pterygia are more common in sunny
climates and in the 20-40 age group. Scientists do not know what
causes pterygia to develop. However, since people who have
pterygia usually have spent a significant time outdoors, many
doctors believe ultraviolet (UV) light from the sun may be a
factor. In areas where sunlight is strong, wearing protective
eyeglasses, sunglasses, and/or hats with brims are suggested.
While some studies report a higher prevalence of pterygia in men
than in women, this may reflect different rates of exposure to
UV light. Because a pterygium is visible, many people want to
have it removed for cosmetic reasons. It is usually not too
noticeable unless it becomes red a