Noun: astigmatism u'stig-mu,ti-zum
- (ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea; common in nearsighted people
"Her astigmatism caused blurred vision at all distances";
- astigmia
- (optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point
"Her astigmatism caused blurred vision";
- astigmia
Derived forms: astigmatisms
Type of: ametropia, condition, status
Antonym: stigmatism
Encyclopedia: Astigmatism