Introduction Surgically induced astigmatism is an unwanted variable that can lead to poorer visual and refractive outcomes in patients undergoing vitrectomy even when a technically precise procedure has been performed. This study assesses the difference in surgically induced astigmatism (SIA) between the traditional 20-gauge vitrectomy and the newer 25-gauge sutureless technique by comparing pre-and post-procedure keratometry readings. Method The study is a retrospective consecutive case series of vitrectomies performed by a single surgeon. There were a total of 47 patients, eight with bilateral procedures, 24 who underwent the 20 gauge, and 31 who had the 25-gauge procedure. Patients were excluded for corneal altering pathology or scleral buckling procedures. Vector analysis of pre-and post-vitrectomy readings was performed using Alpin's method, facilitated by the ASSORT program version 4.1. Results Mean time at which post-operative keratometry readings were taken was 3.9 months (1-36).

PURPOSE: To assess the effects of topical corticosteroids (fluoromethalone) following photorefractive keratectomy (PRK). METHODS: Both eyes of 654 patients had PRK with a minimum of 4 months between treatments. Topical corticosteroids were prescribed for one eye only. Endpoints were assessed by comparing the ratio of intended to actual refractive change in the corticosteroid treated eye with the fellow eye (no corticosteroid use). RESULTS: The corticosteroid treated eyes showed a mean percentage correction of 95.7% compared to the untreated fellow eyes, which achieved a percentage correction of 103.3%- statistical significance of ? = 0.00001. There was more of a trend toward regression in the corticosteroid treated eyes despite intervention with fluoromethalone. CONCLUSION: Topical corticosteroids showed very little positive effect on regression of effect after PRK [J Refract Surg 1997;13(suppl):S454-S455]