Efficacy of Ahmed valve implantation in secondary neovascular glaucoma

Background: the available literature data on the efficacy of the Ahmed valve system implantation for neovascular glaucoma treatment reflect inconsistently the complications and long-term effects of this procedure. Aim: to evaluate the efficacy of the Ahmed system valve in patients with secondary neovascular glaucoma. Material and methods: during the study, medical records of patients with neovascular glaucoma (n = 50) who underwent implantation of the Ahmed valve (model FP8, USA) were reviewed. The postoperative follow-up period was 12 months. Patients were examined by clinical and ophthalmological methods before and after surgery, including refractometry, tonometry, perimetry and optical coherence tomography of the eye. Results: the visual acuity of the study participants before surgery ranged from 0 to 0.3, after surgery - from 0 to 0.4. The boundaries of the peripheral visual fields after valve implantation expanded by an average of 15±2.1 ° (37.5% of cases). There was a significant decrease in IOP 1 year after surgery compared with initial meaning (p