الفهرس 
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Abstract
The present study aimed to evaluate the changes of the cornea after primary pterygium excision using pentacam scheimpflug camera. The study included 45 patients from both sexes with primary pterygia. The patients were separated into 3 groups:- group I for whom the pterygium was excised by simple excision with bare sclera technique.group II for whom the pterygium was excised with conjunctival autograft transplantation. group III for whom the pterygium was excised with limbal-conjunctival autograft transplantation. They were undergone into careful history taking, complete ophthalmic examination and investigations by pentacam preoperative, one month and three months postoperative. In the current study, there was significant reduction in pterygium induced keratometric astigmatism from 3.51 ± 2.79D preoperatively to 1.94 ± 2.13D (P0.001) at 1 month and to 1.71 ± 1.73D (P 0.001) three months postoperatively. In the present study, there was significant reduction in the mean refractive astigmatism to 1.53 ± 1.40D (P <0.001) at 1 month and to 1.31 ± 1.56D (P <0.001) 3 months postoperatively compared with preoperative mean refractive astigmatism which was 2.96 ± 2.14D. As regarding the axis of astigmatism , in this study there was no significant change in axis of astigmatism after pterygium surgery .The mean pre-operative astigmatism axis was 94.56 ± 31.11 degrees; one month after the intervention it was 87.82 ± 47.24 degrees and at 3 months post-surgery, it was 85.98 ± 41.59 degrees. Also, the current study reported a significant increase of spherical power of the cornea from 43.62 ± 1.64D preoperative to 44.94 ± 2.05D at one month and to 44.85 ± 1.95D at three months post-surgery. In this study, there was a significant reduction in mean high order aberration from 0.68± 0.40 before surgery to 0.50 ± 0.49 three months after surgery. This reduction was more in excision with conjunctival autograft transplantation and in excision with limbo-conjunctival autograft transplantation than in bare sclera technique. In the present study, there was significant improvement in mean BCVA from 6/12 (0.26 ± 0.24 log MAR) preoperatively to 6/9 (0.21 ± 0.23, log MAR, P <0.001) at 1 month postoperatively and to 6/9 (0.18 ± 0.19, log MAR, P <0.001) 3 months postoperatively. No significant differences between bare sclera technique, excision with conjunctival autograft transplantation, excision with limbo-conjunctival autograft transplantation.as regarding reduction of astigmatism, increasing the corneal power or improving VA, but there was a significant difference between the three groups as regard HOA with more reduction of mean HOA in excision with conjunctival autograft transplantation and in excision with limbo-conjunctival autograft transplantation. Conclusions: Pterygium surgery significantly reduces the amount of astigmatism but it does not significantly change its axis. No significant differences existed between bare sclera technique, excision with conjunctival autograft transplantation, excision with limbo-conjunctival autograft transplantation.as regarding reduction of astigmatism, increasing the corneal power or improving VA.