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Home Eye disease Eye infections Conjunctivitis

Scientists link climate change to rise in eye conditions

by Staff Writer
November 21, 2024
in Conjunctivitis, Eye infections, Eye research institutions, International, News, Ophthalmic insights, Research
Reading Time: 4 mins read
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New research shows the link between climate change and a rise in eye irritations and conditions. Image: Pormezz/stock.adobe.com

New research shows the link between climate change and a rise in eye irritations and conditions. Image: Pormezz/stock.adobe.com

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Scientists have made a connection between climate change and patients suffering ocular surface eye conditions.

Research in the US has shown that clinical visits by people experiencing these eye conditions more than doubled during times when ambient particulate matter from air pollution was in the atmosphere.

The study, from the University of Colorado Anschutz Medical Campus, which was published in the journal Clinical Ophthalmology, is among the first to look into how climate change may affect the eyes.

“The World Health Organization has declared climate change to be ‘the single biggest health threat facing humanity’,” said the study’s lead author, Assistant Professor Jennifer Patnaik, PhD, MHS, in a media release from the campus.

The assistant professor of epidemiology and ophthalmology at the University of Colorado School of Medicine said: “Yet there are limited studies on the impact of climate change-related air pollution on ocular health.”

The researchers, including Associate Professor Katherine James, PhD, who directs the Climate & Human Health program at the Colorado School of Public Health, examined the associations between ocular surface irritation and allergy-related daily outpatient office visits with daily ambient particular matter (PM) levels in the Denver Metropolitan area.

They obtained data of PM concentrations that were 10 micrometres or less and 2.5 micrometres or less in diameter. The researchers found 144,313 ocular surface irritation and allergy visits to ophthalmic clinics during the study period. The daily visit counts were 2.2 times higher than average when PM concentrations were 110. The clinic visit rate ratio increased as daily concentrations increased.

The study reported that conjunctivitis was the second most common eye disease among the clinic visits during the study, representing exactly one-third of all the visits. The prevalence of ocular allergic conjunctivitis has increased worldwide and varies across regions.

Socioeconomic and environmental factors such as temperature, humidity and air pollution have been proposed as reasons for the increase.

A/Prof Patnaik said the health risks of air pollution and climate change spanned a wide range of outcomes including infectious disease, weather-related morbidity and a variety of lung, kidney and cardiovascular maladies.

“Less studied chronic diseases such as dementia have also been shown to be associated with temperature and air pollutants,” she said.

“Research on the topic of ocular conditions and climate is still in its early stages, therefore more studies are needed to better understand how climate and air pollutants impact eye health.”

A/Prof James agreed.

“This study highlights the systemic health impacts of climate stressors including air quality, wildfires, temperature, and drought conditions, and the continued need to for transdisciplinary research,” she said.

The researchers hoped to build and expand on these initial discoveries, said the study’s senior author, Professor Malik Kahook, MD, professor of ophthalmology at the CU School of Medicine.

“These findings open the door to a deeper understanding of how environmental factors affect eye health. From a clinical standpoint, we’re now seeing more evidence suggesting that particulate matter in the air isn’t just affecting respiratory or cardiovascular health but also directly impacting ocular surface health,” Prof Kahook said.

More reading

RANZCO joins medical colleges calling for climate action

Ophthalmologists sign open letter calling for meaningful action on climate change

How colleges should lead on climate – Medical Journal of Australia 

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