What is a pterygium?

A pterygium is characterized as a triangular fold of conjunctiva that grows onto the cornea. This growth is often seen in individuals who have prolonged exposure to ultraviolet light, dust, or wind, which is why it is more common in sunny climates. The pterygium can become inflamed or irritated and may cause visual disturbances if it progresses far enough over the cornea.

The nature of the pterygium being a triangular shape is significant as it differentiates it from other conditions that affect the eye's surface. For instance, a yellowish-brown deposit would refer to something like a pinguecula, which is not invasive to the cornea but presents as a raised area on the conjunctiva. An irregular corneal shape might describe conditions such as keratoconus, which is entirely different from a pterygium. Lastly, talking about a growth of skin in the eye lacks specificity and may lead to confusion with other types of lesions or growths that are unrelated to the conjunctiva or corneal interface.

Understanding these distinctions helps to clarify the specific nature of a pterygium and its implications for eye health.