Optic tract lesion causes homonymous hemianopia which is incongrous (meaning that the shape of the defect is different in the two half fields). This can be established on confrontation if significant. If subtle it is best documented with formal field test.

In the examination, lesion associated with optic tract is often associated with contralateral pyramidal signs (due to damage to the cerebral peduncle) such as spasticity.
 

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