A clinical study on Ahmed glaucoma valve implantation through pars plana in treating of secondary glaucoma after lensectomy and vitrectomy

Abstract

Objective To evaluate the efficacy and safety of Ahmed glaucoma valve (AGV) implantation through pars plana for secondary glaucoma following lensectomy and vitrectomy surgery. Methods Thirteen eyes of 13 patients who had been diagnosed as secondary glaucoma after lensectomy and vitrectomy were selected in this study. All cases were treated with AGV implantation through pars plana with follow-up of 6 months. The intraocular pressure (IOP), complications, number of antiglaucoma medications applied and best-corrected visual acuity (BCVA) were evaluated during the followe-up. Results The BCVA of 9 eyes were improved, the visual acuities of 4 eyes were constant postopearatively after 6 months. The mean IOP was (40.6±7.7)mmHg preoperatively, (13.6±3.37)mmHg at 1 day after surgery, (17.6±4.5)mmHg in 1 week, (16.54±2.3)mmHg in 2 weeks, (18.46±1.66)mmHg in 1 month, (16.61±1.92)mmHg in 3 months, and (15.69±3.83)mmHg in 6 months(1 mmHg=0.133 kPa). The postoperative IOP descended noticeably(t=9.65~16.23, P<0.05). The mean number of antiglaucoma medications applied dreaseed from (2.92±0.64) kinds preoperatively to (1.23±0.93) kinds at the last follow-up (t=5.92, P=0.0001). The most common complications occurred were transient hyphema, early postoperative hyponoty, detachment of choroid and drainage tube blocking. Conclusion AGV implantation through pars plana is effective and safe in the management of secondary glaucoma following lensectomy and vitrectomy surgery. Key words: Glaucoma valve, Ahmed; Lensectomy; Vitrectomy; Glaucoma, secondary