Table 2. Distribution of Distance Visual Acuity Scores for Affected Eyes at Enrollment and 6 Months.
| Variable | VA, No. (%)a | |||
|---|---|---|---|---|
| High contrast | Low contrast | |||
| Enrollment (n = 54) | 6 mo (n = 45) | Enrollment (n = 54) | 6 mo (n = 42) | |
| VA in affected eyes, Snellen equivalent (No. of letters) | ||||
| Worse than 20/800 (0-2 letters)b | 16 (30) | 1 (2) | 33 (61) | 6 (14) |
| 20/250 to 20/800 (3-32) | 12 (22) | 1 (2) | 13 (24) | 3 (7) |
| 20/50 to 20/200 (33-67) | 10 (19) | 5 (11) | 6 (11) | 25 (60) |
| 20/20 to 20/40 (68-83) | 12 (22) | 22 (49) | 2 (4) | 8 (19) |
| Better than 20/20 (≥88) | 4 (7) | 16 (36) | 0 (0) | 0 (0) |
| Mean logMAR VA (95% CI)c | 0.95 (0.75 to 1.16) | 0.12 (−0.01 to 0.26) | 1.49 (1.36 to 1.61) | 0.73 (0.56 to 0.90) |
| Age-normal VA, No. (%) [95% CI]c | 11 (20) [11 to 33] | 34 (77) [61 to 88] | NA | NA |
| Change in VA from enrollment (logMAR lines) | ||||
| ≥13 Lines better | NA | 15 (33) | NA | 7 (17) |
| 9-12 Lines better | 6 (13) | 14 (33) | ||
| 5-8 Lines better | 4 (9) | 7 (17) | ||
| 2-4 Lines better | 9 (20) | 3 (7) | ||
| Within 1 line | 9 (20) | 10 (24) | ||
| ≥2 Lines worse | 2 (4) | 1 (2) | ||
| Mean change (95% CI), logMARc,d | 0.76 (0.54 to 0.99) | 0.72 (0.54 to 0.89) | ||
| Different test method used from enrollment | 7 (16) | 7 (17) | ||
Abbreviations: NA, not available; VA, visual acuity.
a
Values are expressed as No. (%) unless otherwise specified.
b
LogMAR converted to Snellen as follows: –0.2 = 20/12; –0.1 = 20/16; 0 = 20/20; 0.1 = 20/25; 0.2 = 20/32; 0.3 = 20/40; 0.4 = 20/50; 0.5 = 20/63; 0.6 = 20/80; 0.7 = 20/100; 0.8 = 20/125; 0.9 = 20/160; 1 = 20/200; 1.1 = 20/250; 1.2 = 20/320; 1.3 = 20/400; 1.4 = 20/500; 1.5 = 20/640; 1.6 = 20/800; 1.7 = <20/800.
c
Adjusted for intereye correlation.
d
Positive values indicate improvement in amblyopic-eye visual acuity.