الفهرس 
review of the literatureOnly 14 pages are availabe for public view
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Abstract
The aim of the work: illustrate changes in corneal topography following trabeculectomy versus deep sclerectomy in chronic simple glaucoma patients. Material & Method : Agerelated (3365 years old) and tensionrelated (23.837.2mmHg) chronic simple glaucoma patients were classified into two groups: A Deep sclerectomy group.B Subscleral trabeculectomy group, the followind were done pre., and postoperatively: Slit lamp biomicroscopy. Applanation ocular tension measurement, Fundus examination using the direct ophthalmoscope.Corneal topography performance preoperative, in the 1st day postoperative. Then at one, three and six months corneal topography was performed for each case. Results : Postoperative corneal astigmatic changes are temporary in the early postoperative period. The surgeon should inform the patient of the postoperative transient change in his refraction. The progress in nonpenetrating glaucoma surgeries may help to overcome this major problem, because they induce less astigmatism than SST. So these lower levels of corneal astigmatism induced by DS added to the potential advantages of the procedure that have previously been reported. Significant astigmatism was induced after SST more than DS and it persisted for up to approximately six months postoperatively. Conclusion : studying the corneal topography before and after glaucoma surgery is important to know the effect of these surgeries and to decide on the best approach to each individual patient. SST induce astigmatic changes more than DS & last for longer time.