Table 5
Performances of the non-cycloplegic screening for three different thresholds of manifest astigmatism (true positive case if cycloplegic cylinder value by retinoscopy or on table refractor ⩾2 D)
| Manifest cylinder | Positive test n (%) | Negative test n (%) |
Sensitivity (%) | Specificity (%) | PPV (%) | NPV (%) |
|---|---|---|---|---|---|---|
| ⩾2 D | ||||||
| Right eye | 20 (23) | 68 (77) | 52 | 95 | 85 | 76 |
| Left eye | 25 (29) | 62 (71) | 65 | 90 | 76 | 87 |
| ⩾1.75 D | ||||||
| Right eye | 23 (26) | 65 (74) | 58 | 93 | 83 | 78 |
| Left eye | 35 (40) | 52 (60) | 83 | 81 | 69 | 90 |
| ⩾1.5 D | ||||||
| Right eye | 31 (35) | 57 (65) | 82 | 93 | 87 | 89 |
| Left eye | 40 (46) | 47 (54) | 89 | 76 | 65 | 94 |
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PPV = positive predictive value.
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NPV = negative predictive value.
