scotoma

Từ điển WordNet v3.1 - WordNet Dictionary

noun

an isolated area of diminished vision within the visual field
• Derivationally related forms:
scotomatous
• Hypernyms:
visual impairment, visual defect, vision defect, visual disorder
• Hyponyms:
annular scotoma, central scotoma, hemianopic scotoma, paracentral scotoma, scintillating scotoma, flittering scotoma