[眼科] 散光
散光;象散性
[光] 像散
像散,像散现象
[光 电子] 像散性
象散性;象散现象
[光 电子] 像散现象
像散现象
词根:astigmia
adj.
astigmatic散光的;乱视的;矫正散光的
n.
astigmia散光
An optical system with astigmatism is one where rays that propagate in two perpendicular planes have different focus. 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".