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an illusion in which objects appear larger than their actual size.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.
Perception of objects as larger than they are.
[macro- + G. opsis, vision]
Farlex Partner Medical Dictionary © Farlex 2012
macropsiaA disorder of visual perception (dysmetropsia) in which objects in the visual field appear larger than normal, some forms of which have been fancifully termed the “Alice in Wonderland” syndrome. Retinal macropsia is attributed to compression of receptor spacing, resulting in greater stimulation and a larger perceived image.
Aniseikonia, prescription drugs (e.g., citalopram, zolpidem), illicit drugs (e.g., LSD, psilocybin, marijuana), migraines, epilepsy, hypolycaemia, EBV virus infection, prions.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.
macropsiaAbnormal perception of the size of objects so that they seem larger than they actually are.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005
Anomaly of visual perception in which objects appear larger than they actually are. It may occur as a result of abnormal accommodation (less than required for the fixation distance) or because of various retinal anomalies in which the visual receptors are crowded together, or because of the recent wear of either base-in prisms or a presbyopic correction, etc. Syn. megalopsia. See dysmegalopsia; micropsia; meta-morphopsia.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann