What should you know about retinal migraine?

People may describe flashing lights, shimmering patterns, blind spots, or dimmed vision in one eye. The change may develop gradually and clear, sometimes with headache, nausea, light sensitivity, or vomiting. Migraine aura more commonly affects both eyes’ visual fields, so a clinician may need to distinguish it from retinal or eye-related problems.

The word migraine does not make every visual episode harmless. A blocked blood vessel, retinal problem, inflammation, or another neurological condition can cause similar symptoms. Diagnosis depends on the episode, examination, medical history, and sometimes eye or neurological assessment.

Stop driving and sit somewhere safe during an episode. Cover one eye at a time, without pressing on the eye, and note whether the change is truly in one eye or in both eyes’ field of view. Record when it began, how long it lasted, associated headache, dizziness, vertigo, facial pain and pressure, or triggers. Arrange medical review for a first episode or a changing pattern.

Seek emergency care for sudden vision loss, a curtain-like shadow, severe eye pain, weakness or numbness on one side, trouble speaking, fainting, or a sudden severe headache. Do not wait for vision to return. Prompt assessment is also needed when symptoms last longer than expected, affect one eye repeatedly, or occur with a new neurological symptom.

Ask whether the symptoms fit migraine, whether both eyes or one eye were involved, whether an eye examination is needed, which warning signs should prompt emergency care, and whether a prevention plan is appropriate.