Symptoms of Ocular Migraine
Ocular migraine (retinal migraine) presents with repeated episodes of monocular (one eye only) visual disturbances—including flashes of light, scotomas (blind spots), or complete temporary blindness—that are accompanied by or followed by headache within 60 minutes of the visual symptoms. 1, 2
Key Distinguishing Features
The hallmark that separates ocular/retinal migraine from other migraine types is monocular visual loss (affecting only one eye), not binocular visual symptoms 3, 4. This is critical for diagnosis.
Visual Symptoms Include:
- Flashes of light (photopsias) in one eye
- Scotomas (blind spots or areas of vision loss) affecting one eye
- Partial or complete monocular blindness lasting typically less than 60 minutes 4
- Symptoms are fully reversible in most cases, though permanent visual loss can occur in nearly half of patients with recurrent attacks 4
Temporal Pattern:
- Visual symptoms spread gradually over ≥5 minutes (not sudden onset like stroke) 1
- Each visual symptom typically lasts 5-60 minutes 1
- Headache follows within 60 minutes of visual symptom onset 1, 2
Critical Diagnostic Considerations
What Makes This Different from Other Migraine Types:
Ocular/retinal migraine is NOT the same as:
- Migraine with visual aura (which affects both eyes/bilateral visual fields with fortification spectra and scintillating scotomas) 5, 6
- Ophthalmoplegic migraine (which involves eye muscle paralysis) 3, 5
Important Clinical Pitfall:
The term "ocular migraine" is sometimes incorrectly used to describe typical migraine with visual aura. True ocular/retinal migraine specifically means monocular visual disturbances 3, 7. The best diagnostic method is ophthalmologic examination during an actual attack to confirm monocular involvement 3.
Warning Signs Requiring Further Workup:
While most symptoms resolve completely, persistent visual deficits and documented visual field defects can occur 2, 4. Given that nearly half of patients with recurrent transient monocular visual loss may develop permanent vision loss 4, this diagnosis requires:
- Exclusion of retinal vascular thrombosis
- Evaluation for antiphospholipid antibodies (Hughes syndrome), especially in young patients with recurrent episodes 3
- Consideration of other causes of transient monocular visual loss (amaurosis fugax, optic neuropathy) 3
Associated Headache Characteristics
When headache occurs (within 60 minutes of visual symptoms), it typically has migraine features: