Migraine visual disturbance: what to track
Shimmering zig-zag lines, a bright crescent that grows and drifts, a patch of missing vision — visual disturbances are the most common form of migraine aura, and often the most alarming to experience. Logging them won't stop them, but a dated record of what you see, how long it lasts and what follows gives a clinician detail that's hard to reconstruct after the fact.
Why migraine causes visual disturbance
Visual aura is the classic example of migraine aura in ICHD-3: fully reversible visual symptoms that develop gradually and usually resolve within an hour. The American Migraine Foundation describes both 'positive' features — shimmering, sparkling or a jagged expanding arc known as a scintillating scotoma — and 'negative' features like a blind spot or a patch of lost vision. These are thought to reflect a slow wave of changing activity moving across the visual part of the brain, which is why they tend to spread or migrate across your field of view over minutes.
What logging visual disturbance reveals
The character and timing of what you see is exactly the kind of detail a clinician wants, and exactly what's easy to forget once it passes. A dated log — what the disturbance looked like, which side, how long it lasted, and whether a headache followed — captures that sequence over multiple attacks. Temple keeps this record for your appointment; it doesn't interpret the symptom or diagnose it.
What's worth recording, and when to seek care
Note what you saw (zig-zags, shimmering, blind spot), which side or field, roughly how long it lasted, and whether a headache came after. Keep the safety line clear: visual loss in only one eye, symptoms that come on very suddenly, or a visual change that is new or very different from your usual pattern is worth prompt medical advice rather than only a diary entry.
Temple lets you record what a visual disturbance looked like, which side and how long it lasted in one tap, building a clear month-by-month picture for your appointment.
Common questions
- Are migraine visual disturbances harmful to my eyes?
- Typical migraine visual aura is a temporary, reversible brain phenomenon rather than damage to the eyes, and it usually settles within an hour. But visual loss confined to one eye, or a sudden or very unusual change, should be checked promptly rather than assumed to be aura.
- How is visual disturbance different from the rest of the migraine?
- Visual disturbance is the most common type of aura — a distinct phase that can precede or accompany the headache, and can even occur without much head pain. Logging it separately from the headache is what makes a diary genuinely informative for a clinician.