astigmia
散光
astig·mia /-mɪə/ 名詞
散光
astigmia
n 1: (ophthalmology) impaired eyesight resulting usually from
irregular conformation of the cornea [syn: astigmatism]
2: (optics) defect in an optical system in which light rays
from a single point fail to converge in a single focal
point [syn: astigmatism] [ant: stigmatism]