A lower homonymous quadrantanopia describes the loss of the same upper quadrant from each visual field.
Lower homonymous quadrantanopias are usually caused by damage to the optic radiation as it passes throught the parietal lobes.
For example a lesion in the left parietal lobe will cause a right homonymous lower quadrantanopia, that is the loss of the lower nasal quadrant from the left eye and the lower temporal quadrant from the right eye.
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