Disorders of the Visual Pathway

Lesions of the visual pathway may be classified according to three main locations.

1. Prechiasmal lesions (lesions of the optic nerve) involve visual field defects on the same side.

2. Chiasmal lesions (disorders of the optic chiasm) typically cause bilateral temporal hemianopsia but can also cause unilateral or bilateral visual field defects (see below).

3. Retrochiasmal lesions (disorders of visual pathway posterior to the optic chiasm, i.e., from the optic tract to the visual cortex) cause homonymous visual field defects.

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