Table 4. Significant correlation coefficients between visual and driving-performance parameters.
| Binocular VA | Binocular CS | Binocular VDI* | OSI | ||
|---|---|---|---|---|---|
| Dual Carriageway | Mean speed (km/h) | - | 0.490 (0.028) |
- | -0.538 (0.021) |
| Mountain Road | SDLP (m) | 0.484 (0.031) |
-0.513 (0.021) |
0.467 (0.038) |
- |
| Total distance driven invading the opposite lane (m) | 0.564 (0.015) |
-0.519 (0.027) |
0.548 (0.019) |
0.591 (0.013) |
|
| Total distance driven outside the lane (m) | 0.648 (0.003) |
-0.652 (0.002) |
0.660 (0.002) |
0.819 (<0.001) |
|
| Mean speed (km/h) | -0.651 (0.002) |
0.711 (<0.001) |
-0.551 (0.012) |
-0.600 (0.008) |
|
| Total circuit | Total time (s) | 0.528 (0.017) |
-0.624 (0.003) |
- | 0.550 (0.018) |
| ODPS | -0.686 (0.002) |
0.686 (0.002) |
-0.564 (0.015) |
-0.716 (0.001) |
Note: p-values are given between parentheses.
* Spearman correlations.
SDLP, standard deviation of the lateral position; ODPS, overall driving performance score; VA, visual acuity; CS, contrast sensitivity; VDI, visual disturbance index; OSI, objective scatter index.