Leadership Instincts: Spartan Athletics partners with MSU Burgess Institute   |  Leadership Instincts: UW launches Faculty Diversity Initiative  |  Parent Interventions: Participating in engagement schemes improves young people’s wellbeing  |  Teacher Insights: Foreign language learners should be exposed to slang in the classroom   |  Teacher Insights: Site announced for new specialist mathematics school   |  Parent Interventions: New research shows north-south divide in family law  |  Teacher Insights: Lancaster Castle provides focus for lecture on importance of heritage sites  |  Teacher Insights: Tactile books adapted for blind children  |  Parent Interventions: 'Sleep hygiene' should be integrated into epilepsy diagnosis & management   |  International Edu News: University of Birmingham signs up to global UN agreement   |  International Edu News: Credit card-sized soft pumps power wearable artificial muscles  |  Parent Interventions: High fructose diets could cause immune system damage  |  International Edu News: Submit short films to Bristol Science Film Festival 2021  |  International Edu News: Attachable Skin Monitors that Wick the Sweat Away​  |  Parent Interventions: Scientists model a peculiar type of breast cancer  |  
January 28, 2021 Thursday 01:52:48 PM IST

Air pollution linked to higher risk of sight loss from AMD

International Edu News

Air pollution is linked to a heightened risk of progressive and irreversible sight loss, known as age related macular degeneration (AMD), reveals a large long term study led by UCL researchers. They found that people in the most polluted areas were at least 8% more likely to report having AMD.

AMD is the leading cause of irreversible blindness among people over 50 in high-income countries, with the numbers of those affected projected to reach 300 million by 2040. Known risk factors include older age, smoking, and genetic make-up.

Air pollution has been implicated in brain conditions such as Alzheimer’s disease, Parkinson’s disease and stroke, while a 2019 study by the same research team found that air pollution was linked to elevated glaucoma risk.* Particulate matter exposure is one of the strongest predictors of mortality among air pollutants.

To see if air pollution might also be implicated in AMD risk, the researchers drew on data from 115,954 UK Biobank study participants aged 40-69 with no eye problems at the start of this study in 2006.

Participants were asked to report any formal diagnosis of AMD by a doctor. And structural changes in the thickness and/or numbers of light receptors in the retina – indicative of AMD – were assessed in 52,602 of the participants, for whom complete data were available in 2009 and 2012, using retinal imaging (non-invasive optical coherence tomography or OCT).

Measures of ambient air pollution included those for particulate matter (PM2.5), nitrogen dioxide (NO2), and nitrogen oxides (NOx). The estimates for these were provided by the Small Area Health Statistics Unit as part of the BioSHaRE-EU Environmental Determinants of Health Project. Official information on traffic, land use, and topography was used to calculate the annual average air pollution levels at participants’ home addresses.

The research team found that people in areas with higher levels of fine particulate matter pollution were more likely to report having AMD (specifically, they found an 8% difference in AMD risk between people living in the 25th and 75th percentiles of pollution levels), after accounting for potentially influential factors such as underlying health conditions and lifestyle. All pollutants, except coarse particulate matter, were associated with changes in retinal structure.

The researchers caution that this observational study cannot confirm cause, but their findings align with evidence from elsewhere in the world.

While they cannot yet confirm a mechanism, they suggest that ambient air pollution could plausibly be associated with AMD through oxidative stress or inflammation.


Comments