Benign or malignant tumours within the brain may interfere with vision or eye movements by: direct pressure on the optic nerve or the nerves supplying movements to the eyes; by disruption of the nerves in the visual pathways or in the visual cortex of the brain; or via pressure on the nerves secondary to raised intra-cranial pressure
Clinical Features
Impaired visual acuity in one or both eyes
Defects in the visual field that vary depending on site of lesion
Headache and specific neurological deficits
Management
Unexplained impairment of vision, visual field defects or double vision need referral to an ophthalmologist
