بررسی تغییرات توپوگرافیک قرنیه بعد از اعمال جراحی اسکرال با کلینگ و ویترکتومی

To investigale the topographic changes in the cornea after scleral buckling and vitrectommy. A prospective study was conducted. Thses changes were analyzed based on the type of surgical procedures performed. Design of this study was observational prospective case series. 49 eyes from 48 patients were stratified into four groups based on the type of surgical procedures performed. 10 underwent local buckling (group A), 9 underwent vitrectomy (group B), 18 underwent vitrectomy with encircling (group C) and 12 underwent encircling with additional segmental buckling (group D). These eyes underwent keratometry and videokeratography examinations before surgery as well as at 1, 3, and 6 months after surgery. No statistical significance was observed in the amounts of the induced corneal astigmatism and the refractive cylinder among the four groups. There was statistical significance in the amount’s of the spherical equivalent among the four groups as well as based on the status of the lens(phakia and aphakia)after local buckling (group A). Statistical significance was observed in the amounts of the induced corneal astigmatism before surgery and 6 months after surgery. There was statistical significance in the amounts of the spherical equivalent before surgery and 6 months after surgery among the B, C and D groups as well as based on the status of the lens (phakia and aphakia). After local or additional segmental buckling (groups A and D), corneal steepening, which corresponded to the buckle occurred at a high incidence. After vitrectomy (group B) corneal steepening, which correspond to the scleral sutures occurred that than changed to central steepening over time. After vitrectomy with eneircling (group C) similar changes bbserved but done changed to central steepening over time such corneal changes persisted for up to 6 months in an irregular and asymmetric configuration. Corneal video keratography is a useful tool for evaluationg the post operative corneal curvature. All four types of surgery were found to produce prolonged irregular and asymmetric corneal shape changes, where as the patterns of the changes differed depending on the surgical procedures used.