Analysis Of Alteration In Glaucoma Visual Field Defect Before And After Controlling IOP With Trabeculectomy

Objective: To contrast and analyze the alteration of glaucoma visual field defect before and after controlling intraocular pressure (IOP) therapy through trabeculectomy.Methods: sixty-four eyes of 38 patients with primary open-angle glaucoma (POAG) and chronic angle-closure glaucoma(CACG) were examined with full field by American Synemed perimeter before and after trabeculectomy respectively, The results was arranged with four quadrants as superior temporal, superior nasal, inferior nasal and inferior temporal. The mean defect ( MD ) in each quadrant and full field and mean sensitivity (MS ) in full field was calculated and analyzed statistically. Results: The highest MD in four quadrants of POAG and CACG was inferior temporal, the lowest MD was superior temporal, t he superior nasal and inferior nasal were in between them; MS (t=-2.74, p <0.05) in full field after trabeculectomy improved 0.58dB and MD (t=-3.22, p<0.05) decreased 0 77dB and the difference showed a statistical significance difference. MD in each corresponding quadrant after trabeculectomy were also decreased and the difference were statistically significant (p<0.05) . Conclusions: the average value of visual field defect was reduced after decreasing intraocular pressure (IOP) therapy by trabeculectomy. To control intraocular pressure (IOP) was beneficial for preventing more visual field defect.