Increasing prevalence of myopia and the impact of education in primary-school students in Xi'an, north-western of China.

Purpose: The present study was performed to detect the prevalence of myopia among primary-school students in Xi'an, north-western of China.

Methods: The present study was a school-based study with students aged from 6 to 13 years old. All the individuals underwent ophthalmological examination and spherical equivalent (SE) of refractive error were measured with non-cycloplegic refraction.