Vision loss — or visual loss is the absence of vision where it existed before, which can happen either acutely (i.e. abruptly) or chronically (i.e. over a long period of time). The effects of visual loss can, before the acquisition of alternative adaptations… … Wikipedia
defect — [dē′fekt΄; ] also, and for v. always [, dē fekt′, difekt′] n. [ME < L defectus < deficere, to undo, fail < de , from + facere, to DO1] 1. lack of something necessary for completeness; deficiency; shortcoming 2. an imperfection or… … English World dictionary
Vision system — may refer to: * Visual system (the neurobilogical circuitry and processing that enable living beings to see) * artificial Vision Systems (computer based systems where software performs tasks assimilable to seeing , usually aimed to industrial… … Wikipedia
defect — I (New American Roget s College Thesaurus) n. blemish, fault, flaw, imperfection; deficiency, lack, incompleteness. v. i. desert, flee, abandon. See relinquishment, escape. II (Roget s IV) n. 1. [A lack of something needed] Syn. deficiency,… … English dictionary for students
color vision deficiency — noun genetic inability to distinguish differences in hue • Syn: ↑color blindness, ↑colour blindness, ↑colour vision deficiency • Derivationally related forms: ↑colour blind (for: ↑color blindness), ↑ … Useful english dictionary
colour vision deficiency — noun genetic inability to distinguish differences in hue • Syn: ↑color blindness, ↑colour blindness, ↑color vision deficiency • Derivationally related forms: ↑colour blind (for: ↑color blindness), ↑ … Useful english dictionary
double vision — noun visual impairment in which an object is seen as two objects diplopia often disappears when one eye is covered • Syn: ↑diplopia • Hypernyms: ↑visual impairment, ↑visual defect, ↑vision defect, ↑visual disorder * * * … Useful english dictionary
visual defect — noun impairment of the sense of sight • Syn: ↑visual impairment, ↑vision defect, ↑visual disorder • Hypernyms: ↑disability, ↑disablement, ↑handicap, ↑impairment … Useful english dictionary
tunnel vision — noun visual impairment involving a loss of peripheral vision • Hypernyms: ↑visual impairment, ↑visual defect, ↑vision defect, ↑visual disorder … Useful english dictionary
birth defect — noun a defect that is present at birth • Syn: ↑congenital anomaly, ↑congenital defect, ↑congenital disorder, ↑congenital abnormality • Hypernyms: ↑defect, ↑anomaly, ↑anomalousness … Useful english dictionary
