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Distribution of myopia and astigmatism in urban and suburban school.
| Variables | Suburban (n = 426) | Urban (n = 550) | P value |
|---|---|---|---|
| Allergic conjunctivitis | 101 (23.7) | 173 (31.5) | 0.008 |
| Spherical equivalent | −0.52 ± 1.36 | −0.74 ± 1.59 | 0.025 |
| Astigmatism (cylindrical diopter) | 0.65 ± 0.55 | 0.66 ± 0.58 | 0.723 |
| Conjunctival papillary hypertrophy | 152 (35.7) | 112 (20.4) | <0.001 |
