astigmatism

n. 散光 [化] 像散

发音

US /əˈstɪɡmətɪzm̩/

词形变化

astigmatisms 复数 astigmatisms

别名

astigmism stigmatism

释义与例句

n.
  1. 1.

    A defect of a lens such that light rays coming from a point do not meet at a focal point so that the image is blurred.

    像散

    可数 不可数 工程 物理
  2. 2.

    A disorder of the vision, usually due to a misshapen cornea, such that light does not focus correctly on the retina causing a blurred image.

    散光

    乱视

    可数 不可数 医学

词汇关系

名词

同义词 1

astigmia

反义词 1

stigmatism

上位词 3

condition status ametropia

下位词 2

keratectasia keratoconus

相关短语

mixed astigmatism [医] 混合散光

词源

From a- (negative prefix) + stem of Ancient Greek στίγμα (stígma, “mark, point”) + -ism. Coined by English polymath William Whewell in 1846.

来源：wiktionary