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واجهة للتواصل وتبادل العلم والمعرفه فى مجال البصريات (مفتوح للجميع)


Pterygium and Pinguela

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asrabasi
master optometrest

عدد المساهمات : 70
تاريخ التسجيل : 23/09/2009

Pterygium and Pinguela

مُساهمة من طرف asrabasi في الخميس 12 أغسطس 2010, 16:00

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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, smoky conditions seem to play an important
causal role. A dry eye may contribute to pterygium. </td>
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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. A
pterygium may also cause decreased vision by causing astigmatism. It is
therefore advisable to follow up on medium to large sized pterygia at
least yearly and include a refraction.

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.

    الوقت/التاريخ الآن هو السبت 25 نوفمبر 2017, 04:24