Demographic and clinical features of the study population (n=20 237)
| Characteristic | n | Mean (±SD)/% |
| Age (years) | 20 237 | 54.7 (8.1) |
| Women | 20 237 | 60.7 |
| Self-reported ancestral background/ethnicity | 20 237 | |
| White | 93.2 | |
| Black | 0.5 | |
| Asian | 2.7 | |
| Prefer not to answer | 0.7 | |
| Other | 3.0 | |
| Intraocular pressure (mm Hg) | 19 709 | 15.0 (±3.0) |
| Refractive error (dioptres) | 20 038 | −0.3 (±2.0) |
| Visual acuity in logMAR | 20 214 | 0.0 (±0.1) |
| Macular retinal nerve fibre layer thickness (μm) | 20 237 | 30.3 (±3.4) |
| Ganglion cell-inner plexiform layer thickness (μm) | 20 237 | 71.2 (±5.9) |
| Total retinal thickness (μm) | 20 237 | 312.2 (±13.5) |
logMAR, logarithm of the minimum angle of resolution.