Diagnostic capabilities of the screening tools for detecting any vision problem (95% CIs based on bootstrapping are shown in parentheses)
| Screening tool | Sensitivity | Specificity | PPV | NPV |
| All five tools | 0.84 (0.78 to 0.89) | 0.50 (0.44 to 0.53) | 0.37 (0.33 to 0.42) | 0.90 (0.86 to 0.93) |
| Cambridge crowded acuity | 0.59 (0.51 to 0.65) | 0.73 (0.69 to 0.76) | 0.44 (0.38 to 0.50) | 0.83 (0.79 to 0.86) |
| Randot preschool | 0.33 (0.27 to 0.40) | 0.90 (0.88 to 0.93) | 0.55 (0.46 to 0.64) | 0.79 (0.75 to 0.82) |
| Plusoptix photoscreener | 0.64 (0.57 to 0.71) | 0.88 (0.84 to 0.90) | 0.65 (0.58 to 0.71) | 0.87 (0.84 to 0.90) |
| Spot photoscreener | 0.60 (0.53 to 0.66) | 0.93 (0.91 to 0.95) | 0.76 (0.68 to 0.83) | 0.86 (0.84 to 0.89) |
| Paediatric vision scanner | 0.41 (0.33 to 0.47) | 0.77 (0.73 to 0.80) | 0.38 (0.32 to 0.45) | 0.78 (0.74 to 0.81) |
NPV, negative predictive value; PPV, positive predictive value.