Standard gamble utility values for the NLP, LP-CF, and 20/200–20/400 groups
| Group | Mean utility | SD | 95% CI | p Value | p Value |
| NLP | 0.32 | 0.24 | 0.20–0.44 | NA | 0.003 |
| LP-CF | 0.60 | 0.29 | 0.46–0.74 | 0.003 | NA |
| 20/200–20/400 | 0.80 | 0.21 | 0.73–0.87 | 0.3 × 10−10 | 0.02 |
NLP = no light perception in each eye; LP-CF = light perception to counting fingers in the better eye; 20/200–20/400 = 20/200 to 20/400 in the better eye;
↵using the heteroscedastic Student'st test compared with the NLP group;
↵using the heteroscedastic Student's t test compared with the light perception to counting fingers group; NA = not applicable.