A 29-year-old man was referred to the ophthalmology department by his General Practitioner for monitoring of visual function. Eight years earlier during a routine appointment with his optometrist, it was noticed that he had bilateral symmetrical inferior visual field defects. The patient was not aware of any visual symptoms and subsequent investigations, including imaging of the brain and orbits, had not revealed a cause. Because his father had died of a brain tumour, it had been recommended that his vision and neuro-imaging be re-assessed annually to exclude a neoplasm. Over the next 8 years the visual field defects had remained stable and the imaging normal.
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