Repeatability coefficients (RC) and related parameters (n = 49–55)
| Test | RC | RC′ corrected for truncations | Range (RNG) | Ratio RC′/RNG |
|---|---|---|---|---|
| The repeatability, expressed as RC/RNG, is similar for all tests, although monocular values for the NSLM tend to be lower than those of the remaining glare/stray light tests. Values for contrast sensitivity are lower than those for glare and stray light tests | ||||
| *From Elliott and Sheridan45; †From Elliott et al40; ‡id, no correction for truncations (RC′ identical to RC). Note that all values are on a log scale, including the ones for visual acuity. For visual acuity, 0.1 log unit corresponds to one line on the visual acuity chart. | ||||
| Right eye | ||||
| Conventional stray light meter | 0.34 | id‡ | 1.29 | 0.26 |
| New stray light meter | 0.27 | id | 1.30 | 0.21 |
| Nyktotest | 1.72 | 1.905 | 7 | 0.27 |
| Mesotest | 1.05 | 1.174 | 4 | 0.29 |
| Nyktotest with glare | 2.37 | 2.809 | 8 | 0.35 |
| Mesotest with glare | 0.96 | 1.170 | 4 | 0.29 |
| Visual acuity | 0.2u* | id | 0.7U | 0.29 |
| Contrast sensitivity | 0.15u† | id | 1.2 | 0.13 |
| Left eye | ||||
| Conventional stray light meter | 0.36 | id | 1.35 | 0.27 |
| New stray light meter | 0.31 | id | 1.50 | 0.21 |
| Nyktotest | 1.58 | 1.711 | 7 | 0.24 |
| Mesotest | 0.99 | 1.125 | 4 | 0.31 |
| Nyktotest with glare | 2.11 | 2.406 | 8 | 0.30 |
| Mesotest with glare | 0.97 | 1.184 | 4 | 0.46 |
| Visual acuity | 0.2u* | id | 0.7U | 0.29 |
| Contrast sensitivity | 0.15u† | id | 1.15 | 0.13 |
| Both eyes | ||||
| New stray light meter | 0.29 | id | 1.17 | 0.25 |
| Nyktotest | 1.47 | 1.728 | 6 | 0.29 |
| Mesotest | 0.55 | 0.655 | 4 | 0.16 |
| Nyktotest with glare | 1.52 | 1.641 | 8 | 0.20 |
| Mesotest with glare | 1.41 | 1.673 | 4 | 0.41 |
| Visual acuity | 0.2u* | id | 0.5U | 0.4 |
| Contrast sensitivity | 0.15† | id | 0.9 | 0.17 |