Table 2 Prevalence of myopia defined as −0.5 D or less based on manifest refraction, by education level*.

	No	Per cent (95% CI)
Illiterate	264	18.5 (15.0 to 22.0)
Primary school	345	20.1 (14.8 to 25.4)
High school not completed	846	21.3 (18.7 to 23.9)
High school diploma	1078	23.5 (20.7 to 26.3)
College or graduate school	685	34.0 (29.5 to 38.5)

*Age and sex standardised to the 1996 Tehran population.

CI, confidence interval.