Also known as: indoor humidity, tear film humidity, workspace humidifier
Strongest in Consistency (95). Held back by Recency (31).
Solid mix of RCTs with some methodological gaps.
Good cross-study replication, some imprecision.
Hundreds of participants; meaningful but not large.
Studies agree on direction of effect.
Mostly pre-2020 research; updates may be needed.
No per-outcome numbers yet for this one. Each finding's direction and strength is shown in the research below.
Areas where research points to a consistent direction of effect. The strength of evidence is graded; the size of the effect is not quantified.
Maintain 40-60% indoor humidity, especially in heated or air-conditioned environments. Low humidity accelerates tear film evaporation and worsens dry-eye symptoms. A small workspace humidifier is one of the cheapest and most effective dry-eye interventions.
A systematic review of the digital environment's impact on the ocular surface identified ambient humidifiers and humidity goggles as promising strategies for relieving digital eye strain and dry eye, alongside warm compresses and omega-3 supplementation.
In a study of 444 allogeneic stem-cell transplant patients, lower ambient relative humidity on the ward independently increased the risk of chronic ocular graft-versus-host disease (a dry-eye-like ocular surface disease), with relative risk rising about 4% per percentage-point drop in humidity (r = 0.2, p = 0.03); the authors conclude adjusting air humidity is a potential preventive measure.
Low humidity environments are a common risk factor for dry eye disease, and symptom-relief treatments include tear replacement and humidification of ambient air.
ProtocolEngine provides general health information based on published research. This is not medical advice. Consult a healthcare professional before starting any supplement or health protocol.