Baseline characteristics
| Demographics | Total (N=104 patients) |
| Age in years, mean (range, SEM) | 68.9 (60–81, 1.0) |
| Female, no (%) | 53 (50.9) |
| Ethnicity, no (%) | |
| White Caucausian, no (%) | 59 (56.7) |
| Other Ethnicities, no (%) | 45 (43.3) |
| Afro-Caribbean | 39 (37.5) |
| Asian | 5 (4.8) |
| Hispanic Latino | 1 (1.0) |
| Preoperative clinical characteristics | Total (N=104 eyes) |
| Left eye, no (%) | 69 (66.6) |
| Preoperative BCVA (logMAR), mean (range, SEM) | 0.3 (−0.2 to 2.0, 0.02) |
| Preoperative BCVA 0.4 logMAR or worse, mean (range, SEM) | 0.50 (0.5–1.25, 0.02) |
| IOP, mean (range, SEM) | 23.6 (14–50, 0.5) |
| CCT, mean (range, SEM) | 536.3 (418–664, 3.6) |
| C/D Ratio, mean (range, SEM) | 0.85 (0.3–1.0, 0.01) |
| No of medication classes, mean (range, SEM) | 3.0 (0–5, 0.1) |
| Visual field MD, no (%), mean (range, SEM) | 100 (96.2), –14.8 (+1.52 to −33.9, 0.6) |
| Mild (MD>-6 dB), no (%), mean (range) | 17 (16.3), –3.0 (+1.52 to −5.3) |
| Moderate (MD=-6 to −12 dB), no (%), mean (range) | 21 (20.2), –8.7 (-6.3 to −11.4) |
| Severe/advanced (MD<-12 dB), no (%), mean (range) | 62 (59.6), –21.7 (-12.9 to −33.9) |
| OCT disc RNFL thickness (microns), no (%), mean (range, SEM) | 83 (79.8), 63.3 (30–124, 1.5) |
| Previous ocular surgery | |
| Trabeculectomy, no (%) | 12 (11.5) |
| Baerveldt tube, no (%) | 1 (1.0) |
| Selective laser trabeculoplasty (SLT), no (%) | 12 (11.5) |
| Cyclodiode, no (%) | 6 (5.8) |
| iStent inject (±combined surgery), no (%) | 10 (9.6) |
| iStent inject only | 6 (5.8) |
| iStent inject (+phacoemulsification) | 4 (3.8) |
| Xen, no (%) | 2 (1.9) |
| Kahook dual blade, no (%) | 1 (1.0) |
| Phacoemulsification, no (%) | 31 (29.8) |
| Pars plana vitrectomy (PPV), no (%) | 4 (3.8) |
| Laser-assisted in situ keratomileusis (LASIK), no (%) | 1 (1.0) |
| No previous surgery, no (%) | 35 (33.7) |
| Diagnosis, Primary open angle glaucoma (POAG), no (%) | 76 (73.1) |
| Diagnosis, no POAG, no (%) | 28 (26.9) |
| Secondary open angle glaucoma | 12 (11.5) |
| Pigmentary | 4 (3.8) |
| Uveitic | 2 (1.9) |
| Pseudoexfoliation | 5 (4.8) |
| Traumatic | 1 (1.0) |
| Primary angle closure glaucoma | 6 (5.8) |
| Secondary angle closure glaucoma | 6 (5.8) |
| Neovascular glaucoma | 5 (4.8) |
| Plateau Iris | 1 (1.0) |
| Normal tension glaucoma | 4 (3.8) |
| Intraoperative MMC 0.4 mg/mL, no (%) | |
| 5 min | 22 (21.2) |
| 4 min | 33 (31.7) |
| 3 min | 47 (45.2) |
| 2 min | 2 (1.9) |
| Grade of surgeon, no (%) | |
| Consultant | 81 (77.9) |
| Fellow | 23 (22.1) |
BCVA, best-corrected visual acuity; CCT, central corneal thickness; C/D, cup-to-disc; IOP, intraocular pressure; logMAR, logarithm of the minimum angle of resolution; MD, mean deviation; MMC, mitomycin-C; OCT, optical coherence tomography; RNFL, retinal nerve fibre layer.