| | Demographic | Value () |
| | Age, mean (SD), years | 70.1 (14.7) | | Follow-up period, mean (SD), months | 29.1 (22.8) | | Sex, number (%) | | | Male | 125 (50.6) | | Female | 122 (49.4) | | Race/ethnicity, number (%) | | | White | 100 (40.5) | | Asian | 38 (15.4) | | Hispanic | 45 (18.2) | | African American | 29 (11.7) | | Others | 35 (14.2) | | Diagnosis, number (%) | | | Primary open-angle glaucoma | 148 (59.9) | | Chronic angle-closure glaucoma | 40 (16.2) | | Secondary open-angle glaucoma | 17 (6.9) | | Low-tension glaucoma | 3 (1.2) | | Pseudoexfoliation glaucoma | 17 (6.9) | | Pigmentary glaucoma | 3 (1.2) | | Juvenile glaucoma | 18 (7.3) | | Plateau iris glaucoma | 1 (0.4) | | Snellen visual acuity, median (range) | 20/60 (20/15 to counting fingers at 1 feet) | | Lens status, number (%) | | | Phakic | 58 (23) | | Pseudophakic | 189 (77) | | Prior filtration surgery, number (%) | | | Yes | 31 (13) | | No | 216 (87) | | Preoperative intraocular pressure | | | Mean (SD), mm Hg | 24.6 (8.1) (range 11 to 58) | | <21, number (%) | 91 (36.8) | | ≥21, number (%) | 156 (63.2) | | Cup-to-disc ratio | () | | Mean (SD) | 0.88 (0.13) (range 0.3 to 1.0) | | <0.9, number (%) | 62 (26.8) | | ≥0.9, number (%) | 169 (73.2) | | Humphrey visual field mean deviation | () | | Mean (SD), dB | −15.2 (8.7) (range −32.7 to 10.5) | | <−12, number (%) | 102 (58.3) | | ≥−12, number (%) | 73 (41.7) | | Preoperative split fixation on visual fields, number (%) | () | | Yes | 95 (51.1) | | No | 91 (48.9) | | Location of quadrants with split fixation, number (%) | () | | Inferonasal | 42 (22.6) | | Inferotemporal | 39 (21.0) | | Superonasal | 66 (35.5) | | Superotemporal | 59 (31.7) | | Quadrants with split fixation, number (%) | () | | Mean (SD) | 1.1 (1.4) | | 0 | 91 (48.9) | | 1 | 36 (19.4) | | 2 | 28 (15.1) | | 3 | 10 (5.4) | | 4 | 21 (11.3) |
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