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Table 1 Stratification for enrollment; target N = 195a

From: The Alabama VIP older driver study rationale and design: examining the relationship between vision impairment and driving using naturalistic driving techniques

  Categories for visual processing speed scores (msec)b
Categories for contrast sensitivity scores (log sensitivity)c <  150 150–350 >  350
≥ 1.5    
≥ 1.25 to < 1.5    
< 1.25    
  1. a21–22 participants in each cell
  2. bVisual processing speed measured by UFOV subtest 2
  3. cContrast sensitivity measured by the Pelli-Robson chart