Photophobia is abnormal discomfort from light — one of the defining accompanying symptoms of migraine. It’s reported in 80–90 percent of migraine attacks and is part of the formal ICHD-3 1.1 criterion D (which requires either nausea/vomiting, OR both photophobia and phonophobia, during the attack).

The Greek root means “fear of light”, but clinically the experience is of pain or discomfort triggered by light, not fear of it.

The migraine-specific pattern

During a migraine attack, the threshold for light-induced discomfort drops dramatically. Specific features:

  • Lower threshold to ordinary light — what was comfortable becomes painful.
  • Specific wavelength sensitivity — blue light (around 480 nm, common in screens and fluorescent lighting) is typically the most provocative wavelength.
  • Behavioural response — retreat to dark rooms, eyes closed, pillow over eyes.
  • Resolution with attack resolution — photophobia typically decreases as the headache phase ends.

Some people experience persistent low-level photophobia between attacks — particularly with chronic migraine. The between-attack baseline is often higher than in people without migraine.

The mechanism

Photophobia in migraine involves two convergent pathways:

  1. Trigeminovascular sensitisation — the trigeminal nerve carries both pain signals and modulates ocular function. Sensitisation during attacks lowers the threshold for light-pain coupling.
  2. Cortical hyperexcitability — migraine brains process light differently between and during attacks, with measurable changes in visual cortex response.

The wavelength specificity (blue light particularly provocative) is consistent with melanopsin-containing retinal ganglion cells playing a role — these cells are particularly sensitive to blue light and have direct projections to brain regions involved in pain processing.

FL-41 tinted lenses filter wavelengths around 480 nm and have been studied specifically for photophobia in migraine and other conditions. Multiple small studies show reduced light-triggered attacks and reduced overall photophobia severity with consistent wear.

The lenses are typically prescription rose/orange tinted glasses, available through ophthalmologists or specialty providers. The specific tint matters — generic sunglasses don’t filter the specific wavelengths in the same way.

Other practical interventions:

  • Dim or warm-spectrum indoor lighting at home and work.
  • Blue-light filtering on phones and computers (built-in Night Shift on iOS).
  • Polarised sunglasses outdoors.
  • Frequent breaks from screens during prodromal phases.

What this isn’t

Not a recommendation that all migraine patients need FL-41 lenses — the cost is significant and the benefit varies. For patients with severe interictal photophobia or frequent light-triggered attacks, an ophthalmologist conversation about prescription tinted lenses is reasonable.

Not a substitute for evaluation if photophobia is severe, persistent, or new — these features can also signal ophthalmologic conditions (anterior uveitis, meningitis, others) that warrant urgent assessment.