Table 1

Screening referral criteria

Screening toolReferral criterion
31–48 months>48 months
Far acuity<0.3 logMAR*<0.2 logMAR
Stereoacuity>100 arcsec>100 arcsec
PVS<0.6 Binocularity<0.6 Binocularity
PhotoscreenersHyperopia >4.0D in any meridian
Myopia <−3.0D in any meridian
Astigmatism >2.0D
Anisometropia >2.0D
Hyperopia >3.5D in any meridian
Myopia <−1.5 in any meridian
Astigmatism >1.5D
Anisometropia >1.5D
  • *Children aged 48 months were tested against the <0.2 logMAR criterion for acuity.

  • PVS, Pediatric Vision Scanner.