ABSTRACT
Purpose: to evaluate the corneal topographic and pachymetric changes before and after sub scleral trabeculectomy
Methods: twenty eyes of twenty patients were subjected in this study that were scheduled to undergo standard sub scleral trabeculectomy operation
Results: as regard astigmatic changes measured with Orb scan Corneal Topography system [OCXS]; one patient developed no astigmatic change. Three patients developed decrease in astigmatism. The other 16 patients developed increase in astigmatism The central corneal thickness increased by the first week postoperatively then decreased in the first month and continued to decrease in the second month postoperatively. There was a positive correlation between the central corneal thickness and the intraocular pressure [IOP]
Conclusion: trabeculectomy operation has a benign effect on the re-active condition of the patient, as it is a mild and transient effect. The pachymetic changes showed rise in the first week postoperatively due to the events of surgery followed by a decrease more than the preoperative level due to significant reduction in IOP