Table 2

Advantages of CS over VA for determining driving restriction

CSVALR test between models*
Adjusted R2P value‡Adjusted R2P value‡P value
Both eyes
  Driving when dark0.0450.0650.0650.0100.750
  Driving on the highway0.0950.6090.0970.4380.999
  Driving under foggy conditions0.0120.8340.0130.6310.999
  Driving on unknown roads0.0570.5650.0570.6670.999
  Driving in dense traffic0.0900.8970.0960.2870.979
  Driving restriction score0.0690.6530.0800.1510.857
Worst eye
  Driving when dark0.0560.0220.0370.1470.778
  Driving on the highway0.0960.5280.0970.4470.999
  Driving under foggy conditions0.0830.0010.0180.3120.090
  Driving on unknown roads0.0660.1850.0610.3540.988
  Driving in dense traffic0.1030.1220.0940.3900.943
  Driving restriction score0.1160.0040.0780.2040.345
Difference between the eyes
  Driving when dark0.0500.0320.0440.4480.985
  Driving on the highway0.0910.7380.0960.7280.992
  Driving under foggy conditions0.0800.0010.0120.3390.077
  Driving on unknown roads0.0660.1040.0560.3030.945
  Driving in dense traffic0.0990.1160.0890.3360.942
  Driving restriction score0.1130.0040.0720.2710.292
  • *Best model over worst. P values under 0.05 would mean the test with the highest R2 is significantly better than the other visual test.

  • †Adjusted R2 for entire model. R2 corresponds to the test’s contribution in explaining restrictions and ranges from 0 to 1.

  • ‡Significance of contribution of visual component.

  • CS, contrast sensitivity; LR, likelihood ratio; VA, visual acuity.