Health outcome · symptom
Eye irritation
Also: eye symptoms, ocular irritation, burning eyes, smarting eyes
Stinging, burning, grittiness or watering of the eyes reported by the person, without an allergic or infectious cause. It is one of the core symptoms of building-related complaints and among the most sensitive early signals indoor air gives.
Not reviewed by a clinician. This entry describes a disease or a symptom. We are introducing clinical review for pages of this kind; until that reviewer is in place, this page has been written and checked by the Coridum team but not reviewed by a clinician. It is general information and not medical advice. How this library is built is described in How we build this library.
Why it matters indoors
The eye is exposed directly and continuously, and its response is quick and dose-dependent, which is why controlled exposure studies use it: a person can report the moment air becomes irritating, at concentrations far below anything that produces a measurable clinical change. Formaldehyde is the compound for which this relationship is best characterised.
Two mechanisms produce the same complaint and are frequently confused. Chemical irritation acts on the nerve endings of the ocular surface. Evaporative drying acts by thinning the tear film, which is why low relative humidity, warm air and screen work produce identical symptoms with no irritant present at all — and why raising humidity sometimes resolves a complaint attributed to a chemical.
Coridum keeps this symptom apart from dry eye disease, which is a diagnosed condition, and from conjunctivitis, which needs an allergic or infectious cause.
Indoor factors with evidence
| Factor | Effect | Population | Study design | Source | Checked |
|---|---|---|---|---|---|
| Acrolein | the study concludes only minor eye irritation at this concentration, and found no effect on lung function, nasal swelling or the blood and sputum markers | — · exposure chamber (office-like) | controlled human exposure experiment: volunteers exposed to acrolein alone and in combination under six conditions, with eye blink frequency recorded by electromyography alongside symptom ratings, lung function, nasal swelling and markers of inflammation | F-1660 Dwivedi Acute effects of acrolein in human volunteers during control… (2015) | machine |
Each row is one Finding — a sentence as printed in one study, recorded with its page in the Coridum Knowledge Base. Follow the Finding number for the exact wording and the citation. Checked says who verified the row: machine means every automatic check passed and the surrounding text was read; person means someone read the sentence in the document. Rows are re-checked by a person over time. The studies are curated in the Coridum Knowledge Base; the reading of them together is a Claim, shown separately.
Cite this page
Coridum Research. Eye irritation. Coridum Knowledge G-0208, 16 September 2026. https://coridum.com/k/G-0208/