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Photophobia in migraine: A symptom cluster?
Arnold J Wilkins1, Sarah M Haigh2, Omar A Mahroo3
1Department of Psychology, University of Essex, UK.
Cephalalgia : an International Journal of Headache
|May 15, 2021
Summary
Migraine photophobia involves more than just light aversion. A cortical mechanism, not solely retinal cells, likely explains discomfort from all visual stimuli, suggesting a broader definition of photophobia.
Area of Science:
- Neuroscience
- Ophthalmology
- Neurology
Background:
- Photophobia is a common migraine symptom with uncertain mechanisms.
- Intrinsically-photosensitive retinal ganglion cells (ipRGCs) are implicated in light aversion.
- Traditional photophobia definition may be too narrow for migraine visual discomfort.
Purpose of the Study:
- Review the role of ipRGCs in migraine photophobia.
- Discuss the contribution of cortical mechanisms to visual discomfort in migraine.
- Propose a revised understanding of photophobia in migraine.
Main Methods:
- Literature review of photophobia mechanisms in migraine.
- Analysis of the relationship between retinal and cortical processing of visual stimuli.
- Comparison of photophobia in migraine with other conditions.
Main Results:
- Discomfort from flicker, patterns, and color in migraine is not fully explained by ipRGCs alone.
- A cortical mechanism offers a parsimonious explanation for all visual discomfort in migraine.
- The traditional definition of photophobia as pain from light may be restrictive.
Conclusions:
- Cortical processing plays a significant role in migraine-related visual discomfort.
- A broader definition of photophobia is needed for migraine.
- Future research should compare retinal and cortical contributions to photophobia across conditions to identify biomarkers and therapeutic targets.
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