Table 2 Summary of the differences in prevalence between children attending a government school versus a private school for the visual characteristics assessed
From: Evidence for the need for vision screening of school children in Turkey
|  | Criterion | Government school N = 227 | Private school N = 596 | Significance |
|---|---|---|---|---|
Visual acuity @6Â m | 6/6 or better in both eyes | 76.2% | 86.4% | 0.002 |
Visual acuity ≤ than 6/9.5 in better eye | 7.0% | 2.5% | 0.034 | |
Visual acuity ≤ than 6/19 in better eye | 6.2% | 0.5% | 0.017 | |
Spherical equivalent refraction | ≥ + 2.00 DS | 0.6 | 0.6 | NS |
< −0.50 DS and VA ≤ 6/9 | 6.90% | 5.60% | NS | |
Astigmatism | ≥1.00 < 2.00 DC | 5.10% | 4.40% | NS |
≥2.00 DC | 1.90% | 2.90% | NS | |
Anisometropia | ≥ 1.00 | 5.60% | 4.90% | NS |
Amblyopia/strabismus | See Methods | 4.80% | 1.00% | 0.048 |
Last vision assessment | None | 64.8% | 22.4% | <0.001 |
Presented wearing spectacles | Yes | 5.7% | 8.7% | NS |
Colour vision | Missed ≥2 plates | 0.9% | 4.9% | 0.040 |
Stereopsis | > 800Â s arc | 4.85% | 0.17% | 0.002 |
Referred | No spectacles and VA < 6/7.5 | 13.7% | 5.4% | 0.004 |
Current spectacles not giving 6/6 | 1.3% | 1.8% | NS | |
Presenting acuity ≥6/7.5 but autorefractor ≥ + 1.00DS | 1.3% | 1.0% | NS |