Background: Predisposing lesions of retinal detachment result in severe complications in case of leaving untreated, so the present study has been conducted to determine the results of prophylactic treatment of retinal detachment in patients referring to Emam Hossein hospital since 1992 till 2000. Materials and methods: This study of existing data type was performed on patients undergone prophylactic treatment (lasertherapy and cryoterapy) who had passed follow up of at least three months. Personal characteristics, variables of predisposing lesions, complications and the necessity of additional treatment were all determined. Finally, statistical analysis was done. Results: Totally, 201 patients had undergone treatment, where 76 patients with 88 lesions were studied. Overall success rate of 89.5% was achieved. The reason of further additional treatment (26%) were new breads in 14 (16%) eyes, inadequate initial treatment in 6 (7%) and retinal detachment in 7 (8%). New breads were accompanied by retinal detachment in 4 patients, so their percents were overlapped. Considering the failure of treatment, no significant difference was found between the subgroups; however, failure rate seems to be a little bit higher in aphakic, pseudoaphakic and patients with vitreous hemorrhage. Conclusion: With respect to the high success rate achieved in our study, prophylactic treatment for the predisposing lesions of retinal detachment is strongly recommended. Meanwhile, considering the necessity of additional treatment in most of the patients, longer period of follow up seems to be inevitable. We suggest another clinical trial with greater samples.

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.