In most cases, the deficits are on the side opposite the malformation. We present the case of a patient with a left hemisphere AVM who developed bilateral homonymous visual field defects. The patient subsequentl
Such defects may or may not be congruous, but always respect the vertical meridian. A homonymous hemianopic defect that violates the vertical meridian must be prechiasmal. Such defects may be caused by bilateral multifocal disease of the retina or optic nerve, but are rare and usually ...
Superior altitudinal heminaopia in the left eye(Fig. 14.9): typically seen withnonarteritic anterior ischaemic optic neuropathybut also normal pressure glaucoma (usually bilateral and with arcuate defects in the lower field also), hemicentralvein occlusion, branch retinalartery occlusion,ptosis(less sev...
SIGNIFICANCE Bilateral strokes are rare and should be considered when patients present with bilateral visual field loss characterized by patterns consistent with right and left-sided homonymous visual field defects. Perimetry, dilated funduscopy, and immediate neuroimaging are mandatory for diagnosis, ...
In most cases, the deficits are on the side opposite the malformation. We present the case of a patient with a left hemisphere AVM who developed bilateral homonymous visual field defects. The patient subsequently underwent two embolizations of the AVM using N-butyl cyanoacrylate glue, resulting ...
Visual field defectsmay be • unilateral or bilateral • complete or incomplete • quadrantic • paracentral • sparing the central 10° (macular sparing) • crescentic (limited to unpaired temporal crescent beyond 30° of fixation) • sparing the temporal crescent (temporal crescent ...
deficits more often affect a quadrant or a sector of vision. Recall that any lesion posterior to theoptic chiasmcausesbilateralvisual field cut abnormalities. Note that the eyes are in the frontal area, and thevisual cortexis located in the back of the head, in theoccipital lobe. Therefore, ...