Referral criteria for screening tools for children 31–48 months and more than 48 months of age
| Screening test | Criteria for children aged 31–48 mo | Criteria for children aged > 48 mo |
|---|---|---|
| Cambridge Crowded Acuity | Worse than 6/12 in either eye* | Worse than 6/9 in either eye |
| Plusoptix and Spot photoscreeners | ||
| Hyperopia | > 4.0 D | > 3.5 D |
| Myopia | < −3.0 D | < −1.5 D |
| Astigmatism | > 2.0 D | > 1.5 D |
| Anisometropia IOD | > 2.0 | > 1.5 |
| Randot Preschool Stereoacuity | Worse than 100 arcsec | |
| Pediatric Vision Scanner | Binocularity < 0.60 | |
Note: D = diopters, IOD = interocular difference.
↵* Children aged 48 months were tested against the “worse than 6/9” criterion.