On the issue of whether to wear glasses often after prescription, scholars at home and abroad are not unanimous, mainly according to the needs of individual work and study, the size of the refractive error to decide, refer to the following views: 1, light to moderate myopia of adolescents, due to the usual eye more, ciliary muscle function is not stable, generally advocate that no matter how far to look at the near, should wear glasses; Deng Hui, China-Japan Friendship Hospital Ophthalmology 2, adults 200 degrees 2, adults with mild myopia below 200 degrees, non-close workers, not wear glasses when looking at the near, when looking at the far (such as watching movies) wear glasses; 3, moderate myopia (300 degrees – 600 degrees) and accompanied by astigmatism, should often wear glasses; 4, high myopia (600 degrees or more), regardless of astigmatism, should often wear glasses; 5, the difference between the refractive error of both eyes, should often wear glasses; 6, astigmatism more than 100 degrees. 7, farsightedness of the principle of wearing glasses is: such as looking at the far clear, look at the near have visual fatigue symptoms, can look at the near wear glasses, look at the far do not wear; such as looking at the far look at the near are not clear, it is necessary to wear glasses often.