Understanding light sensitivity: how photophobia impacts people with migraine

How light, color, and brightness affect migraine (neurophysiology)

Light can make migraine pain worse because of how the eyes and brain are connected neurologically. Scientists have identified a particular type of cell in the retina called ipRGCs (intrinsically photosensitive retinal ganglion cells) that help detect light and send signals to the brain.

In essence, there is a “direct wire” from the eye’s light-sensing system to the brain circuits that cause headache pain.

Interestingly, these pathways remain active even in blind individuals who retain some non-visual sensitivity to light, explaining why legally blind migraine sufferers can still experience light induced pain.

Not all light is the same, and different wavelengths of light affect migraine with varying intensities. Blue light can be problematic for people with migraine, as research shows that it generates stronger electrical signals in the retina, and greater activation in the visual cortex (the part of the brain that processes sight) compared to other wavelengths. This heightened response to blue light explains why digital screens, which can emit high levels of blue light, can be especially problematic for migraine sufferers.

Green light, on the other hand, has been shown to have a relatively milder impact on the retina and brain, and in some studies even demonstrated modest calming effects.

Practical recommendations for people with migraine and sensitivity to light

Several strategies may help migraine sufferers manage photophobia:

• Optimize digital displays: Enable dark mode on all devices and consider specialized blue light filtering software to reduce the amount of blue light being emitted by your personal devices.
• Filter blue light: Wear FL-41 tinted glasses, which specifically filter blue light wavelengths most associated with triggering migraine attacks.
• Take screen breaks: Follow the 20-20-20 rule (every 20 minutes, look at something 20 feet away for 20 seconds) to help reduce eye strain.
• Transition between lighting gradually: Avoid sudden changes in lighting conditions, as these can trigger migraine attacks in susceptible individuals. Use dimmer switches and gradually adjust brightness when moving between environments.
• Document your individual response: Maintain a headache diary that includes light conditions to identify personal patterns and sensitivities.
• Avoid Flashing Lights: Flashing or flickering light, especially from artificial lights like LED, can contribute to head pain, eyestrain, disorientation, and nausea in those who suffer from photophobia.

These recommendations reflect the growing understanding of the neurological basis of photophobia in migraine, and offer strategies for reducing light-induced migraine triggers.

If you suspect you may have an abnormal and extreme sensitivity to light with a headache, talk to a doctor. They may diagnose photophobia as part of a migraine, identify any underlying conditions, and work with you to develop a comprehensive management plan for your light sensitivity with migraine.