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An ocular migraine is a temporary visual disturbance that often involves a blind spot or a flashing, shimmering area of light. These visual effects typically last for a few minutes and resolve completely on their own. They are caused by changes in blood flow or nerve cell activity in the visual part of the brain.
read more about an ocular migraine ...The visual disturbance is classified based on whether it is followed by a headache:
The visual symptoms usually start as a small blind spot that expands into a shimmering, jagged ring of light (scintillating scotoma). The cause is a brief spasm of blood vessels or electrical activity in the visual cortex of the brain. Triggers can include stress, bright lights, certain foods, or sleep deprivation.
The visual event temporarily blocks or distorts part of the field of view. The symptoms can be alarming but are harmless to the eye itself and the vision recovers fully. People who experience these events should avoid activities like driving until the visual field returns to normal.
Management involves avoiding known triggers like stress or caffeine. If the event is frequent, a doctor may prescribe preventive medication. Once the visual event starts, resting in a dark, quiet room often helps to minimize discomfort until the symptoms pass.
No, while the visual symptoms are alarming, they are harmless and temporary.
The visual disturbance is processed by the brain, so it affects the visual field of both eyes.
Yes, seeing a doctor is needed to confirm the cause is a benign migraine and not a more serious condition.
If you experience visual disturbances (like jagged lines or blind spots) for the first time, consult a doctor. While usually a migraine aura, it is critical to rule out a retinal tear or a "mini-stroke" (TIA). Seek immediate care if the vision loss is accompanied by weakness, slurred speech, or a severe headache.
AAO. What Is an Ocular Migraine? (aao.org). 2024.
Mayo Clinic. Ocular Migraine: Symptoms & Causes (mayoclinic.org). 2024.
Cleveland Clinic. Migraine With Aura (clevelandclinic.org). 2024.
American Migraine Foundation. Ocular Migraine (americanmigrainefoundation.org). 2024.