Prcis: This study reports 12-month outcomes of combined phacoemulsification and Hydrus Microstent implantation in Asian eyes with moderate-to-severe normal tension glaucoma (NTG), demonstrating a significant reduction in glaucoma medications with an excellent intra and postoperative safety profile.
Objective: To evaluate the 12-month safety and efficacy outcomes of combined phacoemulsification and Hydrus Microstent (Ivantis Inc.) implantation in Asian eyes with moderate to severe NTG.
Methods: Retrospective study of consecutive surgeries performed from August 2019 to August 2021 in a single tertiary eye centre in Singapore. Outcome measures included a reduction in intraocular pressure (IOP), number of glaucoma medications, and intra and postoperative complications.
Results: Data from 21 eyes of 21 subjects were analyzed. All subjects were ethnic Chinese, and the majority were males (14, 66.7%). At baseline, the mean IOP was 13.3 (2.3) mm Hg, all eyes had a Humphrey visual field mean deviation of ≥-6 dB [mean: -13.9 (4.3) dB], and all eyes were on at least one glaucoma medication. There was no statistically significant reduction in IOP at all time points compared with baseline (all P > 0.05). However, the median number of medications was reduced from 2 to 0 at all time points, up to postoperative month (POM) 12 (all P < 0.001). There were no intraoperative complications. No eyes underwent secondary glaucoma procedures nor lost any Snellen line of visual acuity by POM12. One (4.8%) eye experienced numerical hypotony at postoperative day 1, which resolved conservatively. Two (9.5%) eyes underwent laser iridoplasty for stent occlusion by iris. There was no deterioration in Humphrey visual field mean deviation at POM12 compared with baseline (n = 20, P > 0.05).
Conclusion: Combined phacoemulsification and Hydrus Microstent implantation were effective in reducing medication burden in Asian eyes with moderate to severe NTG, up to 12 months postoperatively.
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