Watch out: Link between air pollution and glaucoma


Researchers have found a link between glaucoma and air pollution. Glaucoma is an eye disease that can make you blind if it is not treated. Fluid builds up in the front part of your eye. This increases the pressure in your eye, and damages the optic nerve.

Glaucoma is the second most frequent cause of blindness in the US. Almost 3% of the US population above 40 years of age have the disease. Around half of them are most likely not aware of it yet. Globally, the number of cases have been projected at around 80 million in 2020, almost half of them in Asia.

Glaucoma and the city

Glaucoma is the second most frequent cause of blindness in the US.
People living in areas with high levels of air pollution run a higher risk of developing glaucoma. Photo by mari lezhava on Unsplash

A research team from University College London matched the glaucoma status of 111,370 participants within the UK Biobank study for the period between 2006 and 2010 with the PM2.5 levels at their address. In an article in the prestigious journal Investigative Ophthalmology & Visual Science, they now conclude that those living in areas with higher concentration of fine particulate matter (PM2.5) have a higher risk of developing glaucoma.

The researchers found that people living in urban areas had 6% greater chance of developing glaucoma than those living elsewhere. Also, people living in the 25% most-polluted areas were 18% more likely to report that they had glaucoma than people living in the 25% least-polluted areas. They were also more likely to have a thinner retina. This can be a symptom of glaucoma. So there is a correlation between glaucoma and air pollution, but it is too early to say that air pollution causes glaucoma.

It’s not the pressure, darling, it’s the intoxication

People in the most polluted areas were not more exposed to eye pressure – usually associated with glaucoma – than others. The researchers therefore think air pollution affects glaucoma risk through constricting our blood vessels, or that it has an inflammatory or toxic effect on our nervous system. As we discussed in a recent blog, ultra-fine particles likely increase such risks.

Visible threat in developing countries

In an interview regarding this research, the authors said air pollution levels are far lower in the UK than many other places globally. They also highlighted that their study did not cover indoor air pollution or workplace exposure. It is possible, of course, that UK air is particularly harmful (even outside its pubs). However, chances are that glaucoma risk is much higher in many urban areas in developing countries. There, both outdoor, household and workplace air pollution can be much higher than in the UK. As if smog hadn’t reduced visibility there enough already.

Airmine app

Track your symptoms to air pollution and pollen & get local air quality forecasts

Get it on Google Play


WHO tightens air quality guidelines

WHO releases stricter air quality guidelines to protect human health. The new standard for fine particles (PM2.5) is halved, stressing that exposure to PM2.5 is a major health risk.

The accidental badger detector

PM2.5 levels peaked late at night and early mornings at our sensor test site and we struggled to find out why. Turns out the answer had fur and four legs.

We’re measuring pollen!

We are running our airminer 2.0 sensors to calculate local pollen levels. As expected, pollen levels vary with temperature and precipitation, but we also see significant variations through the day.

When to expect birch pollen in Norway?

Hazel and alder is flowering in Southern Norway, but the key allergen to many of us is birch. When can we expect the birch pollen season to start?

Spring in Europe – alder, hazel and birch pollen

We are heading into warmer and lighter days in Europe, lockdowns or not. And no surprise, the pollen is faithfully here.

Smoke from west? No, dust from east

Did the huge forest fires on the US West Coast in September impact air quality in Europe? Not really, the measurements show. What did have an impact, was dust transported by winds from south east.

PM2.5 levels drop in Wuhan, China

PM2.5 levels drop by almost 40% after the quarantine in Wuhan, China. We expect reductions in air pollution for the rest of the world as the pandemic develops.