Refractive errors cannot be prevented, but they can be diagnosed by an eye examination and treated with corrective glasses, contact lenses or refractive surgery.
屈光不正无法预防，但可通过验光作出诊断，并可选择眼镜、隐形眼镜或手术加以矫正。
2
Methods Infrared and vernier means were used in the examination of dark focus. The stability, relationship between dark focus and refractive error were studied.