quadrantanopia


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quadrantanopia

 [kwod″ran-tah-no´pe-ah]
defective vision or blindness in one fourth of the visual field.

qua·drant·an·o·pi·a

(kwah'drant-an-ō'pē-ă),
Loss of vision in a quarter section of the visual field of one or both eyes; if bilateral, it may be homonymous or heteronymous, binasal or bitemporal, or crossed, for example, involving the upper quadrant in one eye and the lower quadrant in the other.

quadrantanopia

/quad·rant·an·o·pia/ (kwod″ran-tah-no´pe-ah) defective vision or blindness in one fourth of the visual field.

quadrantanopia 

Visual field loss in a quarter of the visual field of the eye. The defect is usually bilateral, as it is caused by a lesion past the optic chiasma. 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) (Fig. Q1). Syn. quadrantanopsia; quadrantic anopsia; quadrantic hemianopia. See hemianopia.
Fig. Q1 Complete, right, superior homonymous quadrantanopia due to a lesion of the optic radiations in the left temporal lobeenlarge picture
Fig. Q1 Complete, right, superior homonymous quadrantanopia due to a lesion of the optic radiations in the left temporal lobe
References in periodicals archive ?
Lesions which occur after the LGN produce more congruent quadrantanopias (optic radiations), respecting the midlines, or hemianopic defects if the whole optic radiation is affected.
A centrocaecal scotoma in one eye accompanied by a superior temporal quadrantanopia in the other eye, termed a 'junctional' scotoma, is suggestive of a prechiasmal lesion close to where the optic nerve meets the chiasm (Figure 3 C).
c) A contralateral, homonymous, inferior quadrantanopia arises from damage to the inferior fibres of the optic radiations.