Table 2.

Mean (±SD) scores for the first and second administration of each low-contrast letter acuity (LCLA) test in all participants. The mean difference and 95% limits of agreement (LoA) are also shown. Paired T-test was used to compare two administrations of each test.

	Repeatability: All Participants in both groups
	2.5% Contrast Level (N=35)					10% Contrast Level (N=45)
	Test	Retest	Mean difference	T-test & P-value	95% LoA	Test	Retest	Mean difference	T-test & P-value	95% LoA
Automated	0.74 (0.19)	0.74 (0.20)	−0. 002 (0.13)	T=−0.10; P=.92	±0.26	0.51 (0.34)	0.49 (0.35)	0.02 (0.11)	T=1.23; P=.22	±0.22
Sloan	0.69 (0.15)	0.65 (0.14)	0.04 (0.12)	T=2.27; P=.03	±0.23	0.38 (0.30)	0.38 (0.30)	0.01 (0.08)	T=0.64; P=.52	±0.16