The major problems are refractive errors like myopia and astigmatism.
主要问题是近视和散光等屈光不正。
单词 | astigmatism | |||||||||||||||
释义 |
astigmatism
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An optical system with astigmatism is one where rays that propagate in two perpendicular planes have different foci. If an optical system with astigmatism is used to form an image of a cross, the vertical and horizontal lines will be in sharp focus at two different distances. The term comes from the Greek α- (a-) meaning "without" and στίγμα (stigma), "a mark, spot, puncture".
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