Table 4. Testing Durations Across 3 Charts in Each Subgroup.

ETDRS Chart Type	Testing Duration, s
	Group A (BCVA, 20/20-20/25)		Group B (BCVA, 20/20-20/40)a		Group C (BCVA, 20/50-20/100)a		Group D (BCVA, 20/125-20/200)a
	First Test	Second Test	First Test	Second Test	First Test	Second Test	First Test	Second Test
Number	33	33	38	36	37	37	51	43
Landolt C	58	53	64	61	76	66	74	73
Alphabet	39	37	41	41	42	42	48	52
P valueb	<.001	<.001	<.001	<.001	<.001	<.001	.001	.002

Abbreviations: BCVA, best-corrected visual acuity; ETDRS, Early Treatment Diabetic Retinopathy Study.

^aIndividuals with sight-threatening conditions including age-related cataract, diabetic macular edema, and age-related macular degeneration.

^bTesting durations were calculated using the Friedman test.