quadrantanopia
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GC: n

S: STANFMED – http://ophthalmology.stanford.edu/blog/archives/2014/09/neuro-ophthalmo-94.html (last access: 11 November .2016); NCBI- https://www.ncbi.nlm.nih.gov/pubmed/9109741 (last access: 11 November 2016).

N: 1. From quadrant (from late 14c., “a quarter of a day, six hours,” from Middle French quadrant, from Latin quadrantem (nominative quadrans) “fourth part,” also the name of a coin worth a quarter of an as, noun use of present participle of quadrare “to make square; put in order, arrange, complete; run parallel, be exact,” figuratively “to fit, suit, be proper,” related to quadrus “a square,” quattuor “four”) + -an- + -opia, (from ops “eye”).
2. Visual field loss in a quarter of the visual field of the eye.
3. The defect is usually bilateral, as it is caused by a lesion past the optic chiasma.
4. It may be homonymous (binasal, bitemporal, upper or lower), crossed (one upper and the other lower), congruous (equal size of the defects), or incongruous (unequal size of the defects).

S: 1. OED – http://www.etymonline.com/index.php?allowed_in_frame=0&search=quadrant ; http://www.etymonline.com/index.php?allowed_in_frame=0&search=opia (last access: 11 November 2016). 2 to 4. MEDICALDICT – http://medical-dictionary.thefreedictionary.com/quadrantanopia – Millodot: Dictionary of Optometry and Visual Science (last access: 11 November 2016).

SYN: quadrantanopsia, quadrantic anopsia, quadrantic hemianopia, quadrant hemianopsia.

S: MEDICALDICT – http://medical-dictionary.thefreedictionary.com/quadrantanopia – Millodot: Dictionary of Optometry and Visual Science (last access: 11 November 2016); TERMIUM PLUS – http://goo.gl/vJGtcS (last access: 17 November 2016).

CR: etiology, glaucoma, ophthalmology, stroke, stye, tumor.