astigmatism

Definitions

General Science

Electronics

  • In a lens or optical system, a defect which causes blur or imperfect image results due to the rays from a given point not converging at a single point.
  • In an electron tube, a defect which causes blur or imperfect image results due to electrons from different axial planes not converging at a single point.

Medical

  • noun a condition in which the eye cannot focus vertical and horizontal lines simultaneously, leading to blurring of vision
http://www.dictionarycentral.com/definition/astigmatism.html