astigmatism

名词 astigmatism:

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

a.stig.ma.tism

n.（名词）
A refractive defect of a lens or other optical system that prevents light rays from converging at a single point, resulting in a blurred or imperfect image.
散光：有折射缺陷的透镜或其它光学系统，阻碍光线汇聚于一个焦点，形成一个模糊或不完全的图象
A visual defect in which the unequal curvature of one or more refractive surfaces of the eye, usually the cornea, prevents light rays from focusing clearly at one point on the retina, resulting in blurred vision.
乱视，像散：一种视力缺陷，眼球表示面一点或多点折射时屈光不均，通常为角膜，使光线不能清晰地在视网膜上聚为一个焦点，从而导致视力模糊不清

来源：
a-
a-
Greek stigma stigmat- [point] from stizein stig- [to tattoo] * see steig-
希腊语 stigma stigmat- [尖端，点] 源自 stizein stig- [刺青] *参见 steig-

【引伸】
as.tigmat.ic
as.tigmat.ically
adv.（副词）