Table 4.
VA and uncorrected refractive error
| Right eye | Left eye | |
|---|---|---|
|
| ||
| VA at presentation, n (%) | ||
| Normal (20/30 or better) | 213 (61) | 214 (61) |
| Reduced, improvement with refraction | 122 (35) | 119 (34) |
| Correctable to 20/30 or better | 92 (26) | 85 (24) |
| Impaired, no improvement with refraction | 16 (5) | 18 (5) |
| Improvement in VA with refraction | ||
| Presenting VA, all patients | ||
| LogMAR, mean ± SD, n | 0.28±0.36, 351 | 0.30±0.43, 350 |
| Snellen equivalent, mean | 20/38 | 20/40 |
| Best-corrected VA, all patients | ||
| LogMAR, mean ± SD, n | 0.12±0.27, 351 | 0.14±0.34, 350 |
| Snellen equivalent, mean | 20/26 | 20/28 |
| Improvement in VA, all patients | ||
| LogMAR, mean ± SD, n | 0.15±0.23, 351 | 0.16±0.23, 350 |
| Lines gained,a mean | 1.5 | 1.6 |
| Improvement in VA, patients with refractionb | ||
| LogMAR, mean ± SD, n | 0.29±0.24, 187 | 0.29±0.24, 190 |
| Lines gained,a mean | 2.9 | 2.9 |
Notes: Distance VA was used for analysis. VA measurements were taken using a Snellen chart. Acuity was assessed with correction for patients who presented with spectacles. Nine patients had missing data or VA that could not be converted to logMAR (hand motions or worse; fix-and-follow). An additional patient had hand motions or worse VA in the left eye than the right. VA was considered improved with refraction if at least one Snellen line was gained on manifest refraction.
Lines of vision gained on the ETDRS chart, by which an improvement of 0.1 logMAR equals a gain of one line.
Includes all patients whose vision improved with refraction by any amount regardless of presenting VA.
Abbreviations: ETDRS, Early Treatment of Diabetic Retinopathy Study; VA, visual acuity; logMAR, logarithm of the minimum angle of resolution.