angioscotoma


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angioscotoma

 [an″je-o-sko-to´mah]
a defect in the visual field caused by the shadow of the retinal blood vessels.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

an·gi·o·sco·to·ma

(an'jē-ō-skō-tō'mă),
Ribbon-shaped defect of the visual fields caused by the retinal vessels overlying photoreceptors.
[angio- + G. skotōma, dizziness, vertigo]
Farlex Partner Medical Dictionary © Farlex 2012

an·gi·o·sco·to·ma

(an'jē-ō-skō-tō'mă)
Ribbon-shaped defect of the visual fields caused by the retinal vessels overlying photoreceptors.
[angio- + G. skotōma, dizziness, vertigo]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

angioscotoma 

A scotoma produced by the shadow cast by the retinal blood vessels. It looks like the branches of a tree extending from the blind spot. It is seen only in special conditions of illumination as when illuminating the fundus of the eye by gently moving a penlight over the closed eyelid, or when illuminating the fundus through the sclera, or when plotting the visual field. This phenomenon is sometimes used as a test to predict gross macular function in a patient with dense cataract where visualization of the fundus is impossible, although better results are obtained with the blue field entoptoscope. Syn. Purkinje figures; Purkinje shadows; Purkinje tree. See entoptic image.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann