Anatomy and symptomatology of the occipital lobe

1. Big picture

The occipital lobe is the main cortical center for vision. In the exam, the most important point is simple:

Occipital lobe lesion = visual symptoms with preserved ocular structures.

So the patient may have homonymous visual field defects, cortical blindness, visual agnosia, color recognition problems, alexia, or elementary visual hallucinations, while the eyes, optic nerves, and pupillary reflexes may be normal.

The examiner usually wants you to localize visual symptoms along the visual pathway:

Retina / optic nerve → optic chiasm → optic tract → lateral geniculate body → optic radiation → occipital visual cortex

A lesion behind the optic chiasm, including the optic tract, optic radiation, or occipital cortex, causes contralateral homonymous visual field loss.