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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) |