Child health · UKMLA & AKT
Monocular vision loss and scotomas
A free high-yield preview for the UKMLA Applied Knowledge Test, covering how to recognise this condition. The full SA Note notes add investigations, management and complications, with practice questions on this topic.
Key high-yield points
- Lesion anterior to chiasm (optic nerve/retina) → monocular visual loss only
- Lesion at or behind chiasm → binocular homonymous field defects (same side of visual field in both eyes)
- Defect is always contralateral to the lesion
Left parietal lobe lesion → disrupts superior fibres of right optic radiation → right homonymous inferior quadrantanopia. Left temporal lobe lesion → Meyer's loop → right homonymous superior quadrantanopia.
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