Research Article
Prevalence of Heterophoria in Tibetan Grade-One Students: The Lhasa Childhood Eye Study
Table 1
Risk factors of amblyopia definition.
| Risk factors |
| Strabismus | Strabismus on examination | Previous strabismus surgery |
| Anisometropia consistent with the worse eye | ≥1.00 D SE anisohyperopia | ≥3.00 D SE anisomyopia | ≥1.50 D SE anisoastigmatism |
| Past or present obstruction of visual axis which could not explain the vision loss directly |
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