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Prevalence of undercorrected refractive error in study sample
| Number of lines improved (presenting visual acuity)* | Number of subjects with undercorrected refractive error | % of total (n=3654) |
| ≥1 line (<50 letters) | 889 | 24.3 |
| ≥2 lines (<45 letters) | 371 | 10.2 |
| ≥3 lines (<40 letters) | 167 | 4.6 |
| ≥4 lines (<35 letters) | 71 | 1.9 |
*For each level of undercorrected refractive error, the level of presenting visual acuity was selected to permit improvement to a maximum of 6/6 Snellen equivalent.
