Table 6.

Visual acuity of subjects grouped by severity

Age group (years)	1–10	11–20	21–30	31–40	41–50	51–60	61–70	71–80	Total
≤20/40 (≤0.3 logMAR)	10/10 (100%)	27/28 (96%)	17/17 (100%)	18/19 (95%)	13/24 (54%)	5/15 (33%)	3/12 (25%)	0/3	93/128 (73%)
>20/40 to ≤20/70 (>0.3 to ≤0.54 logMAR)	0/10	1/28 (4%)	0/17	1/19 (5%)	8/24 (33%)	3/15 (20%)	4/12 (33%)	0/3	17/128 (13%)
>20/70 to ≤20/200 (>0.54 to ≤1.0 logMAR)	0/10	0/28	0/17	0/19	2/24 (8%)	3/15 (20%)	2/12 (17%)	0/3	7/128 (5%)
>20/200 (>1.0 logMAR)	0/10	0/28	0/17	0/19	1/24 (4%)	4/15 (27%)	3/12 (25%)	3/3 (100%)	11/128 (9%)

Best‐corrected visual acuities (BCVAs) are in logMAR units. The BCVA of the better eye is used.