ETDRS 97% ETDRS 25% ETDRS 50% ETDRS 10% ETDRS 8%   Avg -0.03 0.04 0.1 0.02 0.01   Std. dev. 0.05 0.07 0.05 0.02 0.02   95% CI 0.11 0.14 0.1 0.05 0.09                   CVA 98% Mes. CVA 25%Mes. CVA 50%Mes. CVA 10%Glare CVA 8%Glare CVA 98%Pho Avg -0.06 0.02 0.02 -0.02 0.07 -0.03 Std. dev. 0.06 0.04 0.06 0.04 0.03 0.04 95% CI 0.13 0.09 0.11 0.08 0.07 0.08

Table 4b: Mean, standard deviation and 95% confidence interval for test-retest of ETDRS charts and CVA modules presenting similar Michelson contrasts.