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Home / Health News / Vehicle exhaust pollutants associated with common eye condition

Vehicle exhaust pollutants associated with common eye condition

According to a study published in the journal Investigative Medicine, exposure to the highest levels of air pollutants is associated with an almost doubling in risk among those aged 50 and older.

By: ANI   | | Published: August 22, 2019 8:40 am
Tags: Air pollutants  Air Pollution  Air pollution hazards  causes of air pollution  
Vehicle exhaust pollutants - common eye condition - air pollutants - environmental risk factors - how pollutants cause common eye condition
Long term exposure to air pollution has been linked to a heightened risk of several conditions, including respiratory and cardiovascular diseases. © Shutterstock

Long term exposure to pollutants from vehicle exhaust linked to a heightened risk of the common eye condition, age-related macular degeneration, or AMD for short, suggest researchers. Also Read - Why newborns are more susceptible to pollution and how to protect them?

Exposure to the highest levels of air pollutants was associated with an almost doubling in risk among those aged 50 and older, the findings show, reported the study published in the journal, ‘Investigative Medicine’. Also Read - Parents, take note! Air pollution may impair your child’s thinking skills later in life



AMD is a neurodegenerative condition that affects the middle part of the retina, known as the macula. It is one of the most common causes of poor vision in older people and is most likely caused by an interplay between genetic and environmental risk factors.

Long term exposure to air pollution has been linked to a heightened risk of several conditions, including respiratory and cardiovascular diseases. But less is known about its potential effects on eye health. Also Read - Air pollution may up risk of cardiovascular diseases; lowering your BP may reduce the effect

To explore this further, the Taiwanese researchers analysed national health insurance and air quality data from 1998 to 2010 to see if there might be a link between long term exposure to the pollutants nitrogen dioxide (NO?) and carbon monoxide (CO) and a heightened risk of AMD.

As the condition is more common among older age groups, the researchers focused only on 39,819 people aged 50 and above, most of whom lived in either highly (30%) or moderately (32.5%) urbanised areas.

Because there are seasonal variations in air pollutant levels, the researchers calculated an average annual exposure, which was categorised into four different levels.

During the monitoring period, 1442 people developed AMD.

After taking account of potentially influential factors, such as age, sex, household income, and underlying illnesses, those with the highest level of exposure to NO? (more than 9825.5 ppb) were nearly twice (91%) as likely to develop AMD as those exposed to the lowest level (less than 6563.2 ppb).

And people who were exposed to the highest level of CO (more than 297.1 ppm) were 84% more likely to develop AMD than those exposed to the lowest level (less than 195.7 ppm).

The highest rate (5.8%) of newly diagnosed AMD was among people living in the area with the highest level of CO exposure.

This is an observational study, and as such, can’t establish a cause. And the authors emphasised that the data didn’t include information on other risk factors, such as smoking, genetics, and inflammation.

This is the first study of its kind to “demonstrate a significant association between AMD and high levels of ambient NO? and CO,” they wrote.

Recent research has implicated NO? in cardiovascular and neurological ill health, and as the retina is part of the central nervous system, there is a plausible biological explanation for its vulnerability to this pollutant, they added.

Published : August 22, 2019 8:40 am
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