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aberration (ab″әr-a´shәn)   deviation from the normal or usual.
  imperfect refraction or focalization of a lens.
 

chromatic aberration  unequal refraction by a lens of light rays of different lengths passing through it, producing a blurred image and a display of colors.

dioptric aberration  , spherical aberration  inability of a spherical lens to bring all rays of light to a single focus.

ventricular aberration  aberrant conduction between the ventricles.





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