الفهرس 
ANATOMY OF CONJUNCTIVAOnly 14 pages are availabe for public view
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Abstract
SUMMARY
Pterygium is a common disorder seen in hot climate countries as a part of
pterygium belt that was described by Cameron. It is a fibrovascular connective
tissue proliferation extending on the cornea in the interpalpebral space.
Symptoms of this disorder include foreign body sensation, lacrimation, redness
of the eyes, and decrease in visual acuity, diplopia and cosmetic disturbances.
Pterygium induced astigmatism can be the cause of subjective visual
complaint, including decrease of visual acuity, glare sensitivity and monocular
diplopia.
It has been postulated that the cause of astigmatism is tear film pooling at
apex of pterygium, the proposed mechanism is tear meniscus developing
between corneal apex and developing pterygium, causing an apparent flattening
of the normal corneal curvature in that area.
Another possible explanation is traction on the cornea by the pterygium
(due to in growth of the fibrovascular tissue); this is sometimes obvious and
may restrict ocular motility.
Pterygium excision usually improves visual acuity, reverses pterygium
related corneal flattening, consequently, successful pterygium surgery should
reduce pterygium induced refractive astigmatism and improves visual outcome.
This may add one indication for excision of pterygia other than encroachment
on visual axis or cosmetic reasons or limitation of abduction of eye. The aim of
this study is to assess the corneal changes induced by pterygium and effect of
surgery on these changes and to study if these changes are reversible or not.
40 eyes of 39 patients with 1ry pterygium were included in this
prospective highly selective non randomized study. Pterygium surgery was
performed between 1-7-2016 to 31-12-2017. All patients were submitted to
pterygium excision with conjunctival autograft and intraoperative application of
mitomycin C. Corneal topography was performed preoperative, 1month and.