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scotoma
A small area of abnormally decreased or absent vision in the visual field (a 'blind spot'). All people have a 'blind spot' in the visual field of each eye due to the small area of retina occupied by the optic disc, which is not sensitive to light.
Specific
absolute scotoma
relative scotoma
scintillating scotoma
General
visual field loss
References
The Bantam Medical Dictionary, Bantam Books, New York, 1981