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外来的光线通过角膜、晶状质以后,聚焦在视网膜前,则网膜上出现一个虚像,以致看东西模糊不清,这就是近视眼。 形成近视的原因,80％在于角膜曲率的变化,20％在于眼轴的改变。故矫正近视,首先应从角膜着手。 国际上一些眼科专家首先考虑用手术方法来解决角膜曲率的问题。如放射状的角膜切开(RK),准分子激化角膜切削术(PRK)等。虽然疗效可以,但要手术的适应人群仅限于成年人及近视度数不再发展的人,而且有手术并发症及少数失败病历。
External light through the cornea, lens quality, focusing on the retina, the retina appears a virtual image, so look at things blurred, this is myopia. The reason for the formation of myopia, 80% is the change in corneal curvature, 20% change in axial length. Therefore, correction of myopia, the first should proceed from the cornea. Some international ophthalmologists first consider the use of surgical methods to solve the problem of corneal curvature. Such as radial corneal incision (RK), excimer keratectomy (PRK) and so on. Although the effect can be, but the surgery to adapt to the crowd is limited to adults and no longer develop myopia, but also with surgical complications and a small number of failed medical records.