Table 4.
Effect of rod influence [dark-adaptation (DA) minus light-adapted (LA)] on color-discrimination thresholds along the (a) tritan, (b) deutan, and (c) protan confusion axes (and standard errors) for four tritan and ten normal trichromatic subjects (one unaffected member of the proband’s family and nine unrelated).
| Tritan axis | Tritans | Normal trichromats | ||||
| Light level | DA (SE) | LA (SE) | DA-LA | DA (SE) | LA (SE) | DA-LA |
| 9.2 Td | 1427 (134) | 1309 (84) | 119 | 400 (39) | 304 (36) | 97 |
| 92.3 Td | 487 (84) | 426 (34) | 61 | 146 (15) | 136 (15) | 10 |
| Deutan axis | Tritans | Normal trichromats | ||||
| Light level | DA (SE) | LA (SE) | DA-LA | DA (SE) | LA (SE) | DA-LA |
| 9.2 Td | 105 (42) | 147 (41) | −43 | 132 (17) | 129 (18) | 3 |
| 92.3 Td | 81 (6) | 85 (12) | −4 | 93 (14) | 85 (12) | 8 |
| Protan axis | Tritans | Normal trichromats | ||||
| Light level | DA (SE) | LA (SE) | DA-LA | DA (SE) | LA (SE) | DA-LA |
| 9.2 Td | 132 (33) | 146 (42) | −14 | 124 (19) | 126 (21) | −2 |
| 92.3 Td | 82 (9) | 93 (21) | −11 | 103 (16) | 85 (12) | 18 |