astigmatism
1. [ noun ] (ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea
Synonyms: astigmia
Related terms: ametropia keratoconus keratectasia ophthalmology
2. [ noun ] (optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point
Synonyms: astigmia
Related terms: stigmatism condition optics
Similar spelling:   astigmatic
  astigmia