Light Sensitivity: what it usually means
Also searched as: photophobia, eye sensitivity to light, glare sensitivity, light discomfort · Updated 19 Aug 2026 · Educational — not medical advice
The short answer: Light sensitivity, or photophobia, is commonly caused by migraine, eye inflammation, dry eyes, or a recent eye infection, and it typically improves once the underlying trigger resolves. It can also follow certain medications or prolonged screen use. Sudden severe light sensitivity with eye pain, vision changes, or a severe headache needs prompt evaluation, since it can indicate a more serious eye or neurological problem.
See a doctor promptly if…
Sudden severe light sensitivity with eye pain or redness needs prompt eye evaluation.
Light sensitivity with a severe headache, neck stiffness, or fever needs urgent medical assessment.
Light sensitivity following an eye injury should be checked the same day.
New light sensitivity with vision loss or double vision needs urgent evaluation.
Common causes
- Migraine — Light sensitivity is a hallmark migraine symptom, often occurring before, during, or after a headache.
- Dry eyes — Insufficient tear film exposes the eye's surface to irritation, making light feel uncomfortably harsh.
- Eye inflammation or infection — Conditions like conjunctivitis or uveitis can make the eyes markedly more sensitive to light.
- Corneal abrasion or injury — A scratch on the eye's surface exposes nerve endings, causing significant discomfort in bright light.
- Pupil-dilating medications or eye drops — Certain drops and medications widen the pupil, letting in more light than usual and causing glare.
- Prolonged screen use or eye strain — Extended close-up focus can tire eye muscles and heighten sensitivity to bright or flickering light.
What helps
- Wear sunglasses with UV protection outdoors and reduce harsh indoor lighting when sensitive.
- Take regular screen breaks and adjust screen brightness to reduce eye strain.
- Use lubricating eye drops if dryness seems to be contributing.
- Rest in a dim, quiet room during a migraine episode until symptoms ease.
Which doctor to consult
See an ophthalmologist for eye pain, redness, or injury; a neurologist can help if light sensitivity is tied to recurrent migraines.
Questions people ask
Why does light bother me so much during a migraine?
Migraine involves heightened sensitivity in the nerve pathways connecting the eyes and brain, which makes ordinary light feel unusually harsh or even painful. This sensitivity typically eases as the migraine resolves and can be managed by resting in a dim room.
Can dry eyes cause light sensitivity?
Yes, an unstable or insufficient tear film leaves the eye's surface more exposed and irritated, which can make bright or even normal light feel uncomfortable. Lubricating drops and addressing the underlying dryness often reduce this sensitivity over time.
Related symptoms
This guide is educational and doesn't replace a clinical assessment. If a symptom is severe, rapidly worsening, or worrying you, see a doctor — being checked and reassured is never a wasted visit.