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astigmatism是什么意思？

基础释义
例句
柯林斯词典释义
英汉词典释义
英英词典释义
行业词典释义

astigmatism

英[əˈstɪgmətɪzəm] 美[əˈstɪɡməˌtɪzəm]

n. 散光；

例句

Astigmatism can occur in addition to nearsightedness and farsightedness. 散光可发生在除近视和远视.
Under astigmatism even narrow parallel light beams will not combine into one point. 有象散存在时甚至很窄的平行光束都不能会聚在一点.
They have what is called astigmatism. 他们有所谓散光.
Maybe you fall asleep in class because of uncorrected astigmatism. 也许你在课堂上睡觉是因为你的眼睛散光.
Anastigmatic lens : Photographic lens corrected astigmatism as well as other distortions. Process camera lenses are anastigmats. 消像差透镜: 消除纵横像差和其他畸变的摄影用透镜. 制版照相机所用的镜头是消像差透镜.
Anastigmatic lens : Photographic lens corrected for astigmatism as well as other distortions. 消像差透镜: 消除纵横像差和其他畸变的摄影用透镜.

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柯林斯高阶英汉双解学习词典释义

N-UNCOUNT

（眼睛）散光

If someone has astigmatism, the front of their eye has a slightly irregular shape, so they cannot see properly.

英汉词典释义

n.
散光
Maybe you fall asleep in class because of uncorrected astigmatism. 也许你在课堂上睡觉是因为你的眼睛散光。

英英词典释义

Noun
1. (ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea
2. (optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point

行业词典

体育：散光；
医学：散光：眼的反射面曲度参差不等，结果点源光线不是准确地集中在视网膜的焦点上，而是散布在一个或大或小的弥散区。这是由于在一个平面上曲度半径长于或短于与其垂直的半径；
物理学：象散；
生理学：散光；
航天：像散；
药学：散光［眼］；又称 :散光［眼］(As )；