A medical condition involving partial darkness or dimness of vision, or a pathological shadowing of part of the visual field.
From Greek 'hemi-' (half), 'scotos' (darkness), and '-osis' (condition), literally describing a half-darkening or partial darkening of vision.
The medical term reveals the ancient Greek association between 'scotos' (darkness) and visual problems—terms like 'scotoma' (blind spot) and 'scintillating scotoma' all trace back to this same root about lost light in the eye.
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