astigmatism
astigmatism 英 [əˈstɪgmətɪzəm] 美 [əˈstɪɡməˌtɪzəm]
n. [眼科] 散光；[光][电子] 像散性；[光][电子] 像散现象
名词复数:astigmatisms
- The eye has a cornea — a clear, curved layer that protects it. If the cornea's shape is irregular, astigmatism results. People who have astigmatism see images as distorted, so they need to wear glasses or contact lenses.
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- n. [眼科] 散光；[光][电子] 像散性；[光][电子] 像散现象
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1. New astigmatism caused by wrinkling in the corneal flap or other flap complications.
由角膜瓣褶皱所造成的散光或其他角膜瓣的并发症。
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2. Photorefractive keratectomy (PRK). PRK is sometimes used if you have a low to moderate degree of nearsightedness or farsightedness, or if you have nearsightedness with astigmatism.
屈光性角膜切除术（PRK）：当你有低于中等度数的近视或者远视，或者近视加散光，有时会选择PRK。
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3. And these lenses do not correct serious astigmatism.
而且这种眼镜也无法矫正严重的散光。
- astigmatism (n.) "defect in the structure of the eye whereby the rays of light do not converge to a point upon the retina," 1849, coined by the Rev. William Whewell, English polymath, from Greek a- "without" (see a- (3)) + stigmatos genitive of stigma "a mark, spot, puncture," from PIE root *steig- "to stick; pointed" (see stick (v.)).
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