vignetting
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vignetting
[vin-yet´ing]the presence of a brighter light intensity at the center of the fluoroscopic image on an image intensifier than at the periphery of the field.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.
vignetting
1. A graduated reduction in retinal illuminance due to light reaching the pupil at very oblique angles.
2. The difference in absorption between the two portions of photochromic fused bifocal lenses when the segment is not made of photochromic glass. See photochromic lens; retinal illuminance.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann