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Adjective: astigmatic  ,as-tig'ma-tik
  1. Of or relating to a defect in the eye or in a lens caused by a deviation from spherical curvature which prevents light rays from meeting at a common focus and so results in distorted images
    "If you are astigmatic you will notice that some of the lines are darker in some directions than others"

Antonym: anastigmatic

Encyclopedia: Astigmatic