Research Article
Prevalence of Heterophoria in Tibetan Grade-One Students: The Lhasa Childhood Eye Study
Table 3
Prevalence of heterophoria, orthophoria, and heterotropia for grade-one pupils at near and distance fixation.
| ā | Distance (n, %) | Near (n, %) |
| Heterophoria | 86 (4.64) | 421 (22.73) | Exophoria | 78 (4.21) | 414 (22.35) | Esophoria | 8 (0.43) | 7 (0.38) | Vertical phoria | 0 (0.00) | 0 (0.00) | Orthophoria | 699 (91.74) | 1364 (73.65) | Heterotropia | 67 (3.62) | 67 (3.62) |
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