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远视、近视的区别

来源:华人健康网 | 发布时间:2011-03-01 11:17:41 | www.chinesejk.com

远视(hyperopia)由于眼的折光系统异常或眼球的形状发生异常,平行光线不能聚焦于视网膜的现象,如近视、远视、散光等。

近视(myopia)大多数是由于眼的前后径过长或角膜的曲度增加所致。使来自远物的平行光线聚焦在视网膜之前,所以看远物模糊。近视可在眼前加一凹透镜加以矫正。根据近视发病机制的研究,目前一般认为是由于长时间看近物或细小物体情况下,睫状肌持续紧张以致萎缩所致。

远视(hyperopia)一般是由于眼球前后径过短,少数也有因先天性或后天性的角膜曲度减小,以致物像聚焦在静息眼视网膜之后,造成视物模糊。可在眼前加一凸透镜提高折光度以矫正。

(编辑:阳阳 )

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