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n. pl. sco·to·mas or sco·to·ma·ta (-mə-tə)
An area of diminished vision within the visual field.

[New Latin scotōma, from Late Latin, dim sight, from Greek skotōma, dizziness, from skotoun, to darken, from skotos, darkness.]

sco·to′ma·tous adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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Adj.1.scotomatous - relating to scotoma
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
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Fitting partially occlusive contact lenses (scotomatous contact lens) can be useful in neurological patients who complain of constant diplopia."
The scotomatous area often overlies the side-view mirror on one side and impairs the ability to change lanes safely.
Of the eyes with one scotomatous border, most had a field defect located either superior (39.0%) or to the right (33.7%).