barrel distortion

noun Optics.
a distortion produced by a lens in which the magnification decreases toward the edge of the field.

1885–90 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
barrel distortion
photog distortion of an image produced by an optical system that causes straight lines at image margins to bulge outwards

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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