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Specificity and sensitivity for each method to determine the presence of myopia and astigmatism. Sensitivity and specificity were calculated only once the “do not know” responses were excluded.
| Sensitivity | Specificity | Do not know (%) | |
|---|---|---|---|
| Direct method | 0.41 | 0.86 | 53.2 |
| Lay terms method | 0.73 | 0.68 | 50.5 |
| Indirect method | 0.84 | 0.53 | 1.8 |
| Astigmatism | 0.65 | 0.76 | 40.4 |
