الفهرس 
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Abstract
Corneal topographic changes induced by pterygium are almost reversible after surgical excision. Successful pterygium surgery significantly reduces topographic astigmatism, surface asymmetry index, surface regularity index, and corneal flattening.
This prospective study included 20 patients who were subjected to pterygium excision with a conjunctival autograft at the ophthalmology department of Matrouh General Hospital.
The aim of the study was to determine the tomographic changes after pterygium excision with conjunctival autograft.
Complete Ocular and medical history were taken from each subject and a detailed ophthalmic examination was performed including best corrected visual acuity (BCVA), manifest refraction, full examination by slit–lamp, dilated fundus examination to exclude posterior segment abnormality, and Pentacam (Oculus®, Wetzlar, Germany) measurement of the parameters before the surgery and at one month and three months follow-up visits.
Regarding demographic characteristics among the studied group, about 65% of the studied group were males while 35% were females. The right and the left eyes are equally affected.
As regards corneal K-readings in the studied group, the current study showed that Front K1, Front K2, and Front Km increased postoperatively, the differences were significant in Front K1 only. Front Astigmatism decreased postoperatively; the differences were significant. While corneal back K-readings decreased postoperatively, the differences were not significant.
With reference to Elevation Data, the current study showed that Elevation Data decreased postoperatively, and the differences were significant.
Regarding manifest refraction, the present study detected that spherical power significantly decreased postoperatively. Cylindrical power significantly decreased postoperatively. Spherical Equivalent SEQ non-significantly decreased postoperatively.
As regards BCVA, BCVA increased postoperatively, and the differences were significant.