The Cardiff Acuity test was compared to the Snellen Acuity test by measurements taken through 1, 2 and 3 diopters of blur. The Cardiff acuities were taken with both minimum resolvable and minimum detectable criterion. Acuity readings were obtained from 59 eyes (59 subjects) at a distance of 1 meter. Poor correlations were found between Snellen acuities and Cardiff acuities at all levels of blur (r < 0.50). Minimum detectable with Cardiff gave the highest (best) acuities followed by minimum resolvable with Cardiff and Snellen measuring the lowest (worst) acuities for each level of blur.
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