RESUMO
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
RESUMO
Aim: to evaluate angle-supported AC Phakic IOLs for correction of high myopia; as regards contras t sensitivity testing, IOP, and corneal endothelial count
Methods: twenty eyes of eleven patients with high myopia were enrolled in this study. Three patients were males and eight were females. Their age ranged from between 20 to 36 years with a mean of 26.36 +/- 5.14. A complete preoperative ocular examination was performed on each patient including; IOP measurement, Specular microscopy and Contrast sensitivity testing. The Safety Flex Phakic 6TM was used in this study. Follow-up examinations were made at 48 hours; 15 days; 1, 2, 3 and 6 months after surgery
Results: the preoperative refractive error ranged from -10.50D to -24.00D with a mean of -18.03 +/- 3.92D. The IOL was implanted in both eyes of 9 patients and in one eye of two patients. The preoperative mean endothelial cell density was 2863.10 +/- 412.00 cells/mm2. After surgery; the mean cell density decreased to a mean of 2764.85 +/- 400.90 cells/mm2 at 3-months and 2739.85 +/- 406.38 cells/mm2 at 6-months. Endothelial cell loss was 3.43% at 3-months and 4.3% at 6-months in comparison with the preoperative value. The preoperative mean IOP was 12.60 +/- 1.57 mm Hg; which increased to 15.75 +/- 5.01 at 2 weeks post-op. However the IOP decreased again to a mean of 13.20 +/- 1.96 mm Hg 6-month after surgery. Contrast sensitivity was measured to all patients using Cambridge low contrast gratings. Preoperatively, the mean contrast sensitivity was 142.25 +/- 70.60. After surgery, contrast sensitivity improved to a mean of 209.60 +/- 117.45
Summary: implantation of an AC-IOL in a phakic eye to correct high myopia is a technique recently revived. It represents the most satisfactory surgical procedure currently available for correcting high myopia. The simplicity and the reversibility of the method permit it to be performed by most ophthalmologists