الفهرس 
List of ContentsOnly 14 pages are availabe for public view
 |  | from | 119 |  |  |
| | | from | 119 | | |
Abstract
Eyelid is a thin fold of skin that covers and protects the human eye. Many benign and malignant disorders can affect the eyelids .Several studies have evaluated the influence of eyelids on corneal shape. Also several studies investigated the effects of upper eyelid surgery on corneal topography. The aim of the study is to evaluate the influence of different eyelid disorders on corneal parameters measured by oculus pentacam. This study included 30 eyes of 30 patients presented with eyelid disorders recruited from Mansoura ophthalmic center for one year duration in the period from March 2019 to February 2020.All the included cases were subjected to full history taking (including ophthalmic history) and full ophthalmological examination before the surgery. Corneal topographic parameters, corneal indices and corneal maps parameters were evaluated using automatically rotating Scheimpflug camera (Pentacam, Oculus Optikgeräte GmbH. Wetzlar, Germany). The cases were followed up at 1 week and 1 month postoperatively to record corneal topographic parameters, corneal indices and corneal maps parameters.There were 14 males and 16 females with mean age of 42.10 ± 22.701 years. Among the included cases, 6 had chalazion, 2 had lid papilloma, 10 had ptosis, 3 had entropion, 3 had ectropion and 6 had dermatochalasis. In result analysis no statistically significant difference existed between preoperative, one week postoperative and four weeks postoperative mean K1, K2, mean K and K max in the different disorders except in K max values in ptosis group. No statistically significant difference existed between preoperative, one week postoperative and four weeks postoperative corneal astigmatism in the different disorders. No statistically significant difference existed between preoperative, one week postoperative and four weeks postoperative mean front and back elevation values in any of the studied groups. No statistically significant difference existed between pre-operative, one week post-operative and four weeks post-operative mean HOA values in any of the studied groups. No statistically significant difference existed between preoperative, one week postoperative and four weeks postoperative mean change and the direction and percentage of change and the direction of the steep axis in any of the studied groups. The correlation index between target and surgically induced astigmatism vector is 0.90 which indicates high association between both vectors and this means that surgery had little to no effect of the development of astigmatism in the studied sample