Info

CT scan/MRI

The optic chiasma is closely associated with the pituitary fossa.

The optic chiasma is closely associated with the pituitary fossa.

- Optic tract

Pituitary

- Optic tract

_ Lower temporal quadrant vision

Pituitary

Upper temporal quadrant vision

Homonymous hemianopia

An incongruous homonymous hemianopia (i.e. one eye more affected than the other) suggests a compressive lesion of the optic tract near the chiasma.

- vascular cause (sudden onset) • ■ii - tumour (gradual onset)

Optic nerve CT scan/MRI

N.B. Pupil response may be impaired when light is shone from affected field

Optic tract

The 'incongruous' defect occurs as a result of rotation of nasal and temporal fibres. 135

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