Table 3.

Performance compared to chance level (25%).

Snellen size	Percent success—with color (%)	Difference from chance (p-value)—with color	Percent success—white-only (%)	Difference from chance (p-value)—white-only
20/1600	97.1	p < 1 × 10e−10	96.9	p < 1 × 10e−10
20/1400	98.4	p < 1 × 10e−10	96.6	p < 1 × 10e−10
20/1200	97.3	p < 1 × 10e−10	94.6	p < 1 × 10e−10
20/1000	99.3	p < 1 × 10e−10	96.4	p < 1 × 10e−10
20/800	96.0	p < 1 × 10e−10	87.8	p < 1 × 10e−10
20/600	69.6	p < 1 × 10e−10	22.7	0.82
20/500	71.8	p < 1 × 10e−10	22.9	0.80
20/400	36.1	0.0001	23.5	0.72
20/360	24.2	0.62	21.8	0.90