Table 4

Performances of the non-cycloplegic screening for three different thresholds of manifest astigmatism (true positive case if Retinomax cycloplegic cylinder value ⩾2 D)

Manifest cylinderPositive test n (%)Negative test
n (%)
Sensitivity (%)Specificity (%)PPV (%)NPV (%)
⩾2 D
 Right eye32 (11)270 (89)51988191
 Left eye38 (13)264 (87)54988490
⩾1.75 D
 Right eye42 (14)260 (86)59957192
 Left eye60 (20)242 (80)80957895
⩾1.5 D
 Right eye62 (20)240 (80)71905894
 Left eye70 (23)232 (77)84927196
  • PPV = positive predictive value.

  • NPV = negative predictive value.