Demographics
| Standard | Alginate | Total | p Value | |
| No | 115 | 120 | 235 | |
| Age (years) | 0.845 | |||
| Mean (SD) | 60.36 (13.52) | 61.40 (12.11) | 60.89 (12.81) | |
| (Range) | (17-85) | (33-88) | (17-88) | |
| Sex (n/%) | 0.500 | |||
| Male | 64 (55.7%) | 72 (60.0%) | 136 (57.8%) | |
| Female | 51 (44.4%) | 48 (40.0%) | 99 (42.1%) | |
| Iris colour (n/%) | 0.222 | |||
| Blue-green-grey | 50 (43.5%) | 53 (44.2%) | 73 (31.1%) | |
| Hazel | 34 (29.6%) | 25 (20.8%) | 59 (25.1%) | |
| Brown | 31 (30.0%) | 42 (35.0%) | 73 (31.1%) | |
| Glaucoma diagnosis | 0.434 | |||
| OAG | 71 (61.7%) | 78 (65.0%) | 149 (63.4%) | 149 (63.4%) |
| OHT | 44 (38.3%) | 42 (35.0%) | 86 (36 .6%) | 86 (36 .6%) |
p Value for age by Wilcoxon two sample test (due to non-normal distribution), and for sex and iris colour by χ2.