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Log retinal frequency (cpdcrit) as a function of logMAR0 for the normally sighted subjects and patients with DM. The right y-axis shows the linear values of cpdcrit and the top x-axis shows the Snellen equivalents of the logMAR0 values. Solid line represents least-squares best-fit linear regression line; dashed line represents scale invariance, with the assumption that 30 cpd is equivalent to 0 logMAR.
