الفهرس 
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Abstract
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 .
The cornea was studied as regard changes of the anterior and posterior corneal surfaces ( Km; the mean keratometric power ,front and back corneal astigmatism) and corneal thickness.
Fourty eyes of thirty nine patients were included in this prospective study. All eyes had primary pterygium complaining of visual affection and seaking for pterygium surgery with a mean of cylindrical error 3.89±1.79 SD.
Patients with recurrent pterygium, media opacity such as corneal opacity, cataract, PCO, and vitreous opacities were excluded from our study .
We also excluded patients with corneal diseases as corneal ulcer or scarring.
Pterygium surgery was performed between November 2012 to July 2013and Pentacam was performed preoperatively, and three months postoperatively.
All patients were submitted to pterygium excision with conjunctival autograft and intraoperative application of mitomycin C.
Statistically significant change of the mean keratometric power of the anterior corneal surface (Km) (P value= 0.001) detected after three months to its pre-surgery value.there was also significant change in keratometric power of posterior surface (p value = 0.001).
There was statistically significant decrease in astigmatism on anterior corneal surface(P value= 0.006)after three months of surgery while there was significant change in astigmatism on posterior corneal surface (P value= 0.019).
Corneal thickness (pachymetry) showed insignificant decrease three months after surgery (P value =0 .226).
Statistically significant decrease of both spherical equivalent and cylinderical error (p value = 0.001)andthere was statistically significant increase in visual acuity (p value = 0.003) three months post pterygium surgery.