L/R Hemifield: Monocular vision loss is not cortical, but the right (or left) side of the visual field can be impaired (hemianopsia or quadrantanopsia) from a cortical lesion in the occipital lobe of the brain. Physical trauma can be the cause of such brain damage, and in a child would be suggestive of abuse. A CT/MRI is the next test to correlate the visual field with the anatomy.
Answered 12/26/2015
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