astigmatism Hear it!

astigmatism definition

astig·ma·tism (ə stigmə tiz′əm)

noun

  1. an irregularity in the curvature of a lens, including the lens of the eye, so that light rays from an object do not meet in a single focal point, resulting in an indistinct or distorted image
  2. distorted view or judgment, as because of bias

Etymology: < Gr a-, without + stigma (gen. stigmatos) a mark, puncture (see stick) + -ism

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