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So in a society that reads from left to right, left hemianopia has little effect on reading ability, but right hemianopia can be devastating.

Transitory hemianopia is rare and is no doubt most frequently of toxic origin.

The authors of “F.D.R.’s Deadly Secret” examined short film clips and deduced that he had a defect in his left visual fields known as a hemianopia.

Cases of disease are on record in which loss of visual memory has occurred without hemianopia.

The optic tract, which crosses the crus, may also be affected, and hemianopia result.