Table 4a

	Mean diff of tests	Sigma diff of CVA and ETDRS	Sigma diff CVA test-retest	Sigma diff ETDRS test-retest	Corrected Sigma of test differences*
Mesopic CVA - ETDRS 98/7%	-0.08	0.09	0.12	0.06	0.11
Mesopic CVA - ETDRS 50%	-0.06	0.1	0.09	0.1	0.12
Mesopic CVA - ETDRS 25%	-0.04	0.13	0.05	0.11	0.15
Photopic CVA - ETDRS 98/7%	-0.09	0.2	0.09	0.06	0.20
Photopic CVA - ETDRS 10%	-0.07	0.07	0.12	0.04	0.10
Photopic CVA - ETDRS 8%	-0.06	0.09	0.05	0.04	0.09

Table 4a: Mean and sigma (+/- 1SD) of the Differences between the CVA module and chart testing are presented along with the Reliability Test-retest Sigma of CVA and chart testing. *Corrected Sigma is the sigma that is corrected according to Bland and Altman in which the sigma of the difference (logMAR) of the two tests is modified by the measured sigmas of test-retest differences for each of each test (=√SD+¼ * SD₁²+¼ * SD₂²)