Preoperative data
| Age (years) | 49.8±15.7 |
| Sex (female/male) | 34/26 |
| Race | Black Africans (100%) |
| Eye laterality (right/left) | 27/33 |
| Intraocular pressure (mm Hg) | 45.0±12.1 |
| Cup:disc ratio | 0.86±0.12 |
| Best-corrected visual acuity (Snellen) | 0.61±0.42 |
Values are mean±SD.