Visual acuity and visual field changes in patients with end-stage PACG with tubular visual field after cataract surgery

Introduction: To investigate the impact of cataract surgery on visual acuity and visual field (VF)in patients with end-stage glaucoma with tubular visual field, and assess the risk of severe visual impairment.Methods: Retrospective analysis of the case data of patients with end-stage glaucoma with tubular visual field who underwent cataract surgery in our hospital in the past 7 years.Results: A total of 59 patients with 63 eyes were enrolled, 62 eyes were primary angle-closure glaucoma(PACG) and 1 eye was primary open-angle glaucoma(POAG). The last follow-up time was an average of 9 months, and no cases of severe vision loss occurred. Best corrected visual acuity(BCVA) improved significantly after surgery (0.57 +/- 0.46 vs. 0.45 +/- 0.43logMAR, P<0.01), and there was a significant drop in intraocular pressure (22.85 +/- 9.7 vs.16.07 +/- 3.38, P<0.01), a reduced number of glaucoma medications (2 +/- 1.32 vs. 0.5 +/- 1, P<0.01), statistical improvement in visual field index (VFI) and mean defect (MD) (12.3%+/- 7.65% vs. 16.1%+/- 9.84%, P<0.01) (-29.09 +/- 2.16 vs. -28.31 +/- 3.01, P<0.01) after surgery. The higher the preoperative VFI and MD were, the better the postoperative BCVA (r=-0.387, r=-0.347 respectively). The degree of postoperative VFI improvement was significantly correlated with preoperative MD (r=0.372, P<0.01). During the follow-up period, 5 eyes (8%) underwent anti-glaucoma surgery due to elevated intraocular pressure (IOP).Conclusion: Cataract surgery can significantly improve visual acuity and VF in patients with end-stage PACG with tubular visual field, and no patients have severe visual impairment. The less preoperative VF damage there is, the greater the postoperative visual acuity and VF improvement. Poor IOP control is the main cause of further damage to postoperative visual acuity and VF.