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Noun astigmatism has 2 senses
  1. astigmatism, astigmia - (ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea
    --1 is a kind of ametropia
    --1 has particulars: keratectasia; keratoconus
  2. astigmatism, astigmia - (optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point
    --2 is a kind of condition, status
    Antonyms: stigmatism