Pterygium and Pinguecula
A pterygium is fleshy tissue that grows over the
cornea (the clear front window of the eye). It may remain small or may grow
large enough to interfere with vision. A pterygium most commonly occurs on the
inner corner of the eye, but can appear on the outer corner as well. The exact
cause is not well understood. Pterygium occurs more often in people who spend a
great deal of time outdoors, especially in sunny climates. Long-term exposure
to sunlight, especially ultraviolet (UV) rays, and chronic eye irritation from
dry, dusty conditions seem to play an important causal role. A dry eye may
contribute to pterygium.
When a pterygium becomes red and irritated, eyedrops or
ointments may be used to help reduce the inflammation. If the pterygium is
large enough to threaten sight or grows rapidly, it can be removed surgically.
Despite proper surgical removal, the pterygium may return,
particularly in young people. Protecting the eyes from excessive ultraviolet
light with proper sunglasses and avoiding dry, dusty conditions and use of
artificial tears may also help.
A pinguecula is a yellowish patch or bump on the
white of the eye, most often on the side closest to the nose. It is not a
tumor, but an alteration of normal tissue resulting in a deposit of protein and
fat. Unlike a pterygium, a pinguecula does not actually grow onto the cornea. A
pinguecula may also be a response to chronic eye irritation or sunlight.
No treatment is necessary unless it becomes inflamed. A
pinguecula does not grow onto the cornea or threaten sight. If particularly
annoying, a pinguecula may on rare occasions be surgically removed, but the
postoperative scar may be as cosmetically objectionable as the pinguecula.