03 November 2026
A new study published in the British Journal of Ophthalmology has explored the effect of outdoor air temperature on intraocular pressure (IOP) readings among primary open-angle glaucoma patients receiving medical treatment.
Researchers reviewed the medical records of 77 patients with the condition who were treated by Kyoto Prefectural University of Medicine Hospital between 2012 and 2023.
They examined 2655 IOP measurements alongside a range of climate variables for Kyoto gathered from the Japan Meteorological Agency website, including ambient temperature, atmospheric pressure, relative humidity, wind speed, precipitation, sunshine duration and season.
They found that outdoor temperature was reliably correlated with IOP – even when IOP was measured indoors.
A lower ambient air temperature was associated with a significant increase in intraocular pressure.
“We focused on which climatic factors could contribute to IOP fluctuation in patients with stable POAG under medical treatment, and we found that among the factors examined, ambient temperature showed a significant, negative, and independent contribution to IOP fluctuation,” the researchers explained.
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