Claim: Higher ozone, lower humidity levels associated with dry eye disease

So where was all this eye “disease” in, say, Los Angeles in 1955 when ozone levels could be eight or so times higher than today’s standards?

The media release is below.


Higher ozone, lower humidity levels associated with dry eye disease

In a study published online by JAMA Ophthalmology, Dong Hyun Kim, M.D., of Gachon University Gil Medical Center, Incheon, Korea and colleagues examined the associations between outdoor air pollution and dry eye disease in a Korean population.

Air pollution is an important public health concern. According to the World Health Organization, most significant constituents of air pollution include particulate matter (PM), ozone, nitrogen dioxide, and sulfur dioxide. Ambient levels of air pollution are known to be associated with a wide range of adverse health effects that particularly affect the respiratory and cardiovascular systems. Ocular surface abnormalities related to air pollution are thought to be a subtype of dry eye disease (DED); however, to date, there has been no large-scale study evaluating an association between air pollution and DED that includes multiple air pollutants.

This study included data on 16,824 participants in the fifth Korea National Health and Nutrition Examination Survey, conducted from January 2010 to December 2012. Dry eye disease was defined as previously diagnosed by an ophthalmologist or the presence of frequent ocular pain and discomfort, such as feeling dry or irritated. Outdoor air pollution measurements (average annual humidity, particulate matter with aerodynamic diameter <10 µm [PM10], ozone, and nitrogen dioxide levels) were collected from 283 national monitoring stations in South Korea. The researchers found that decreased humidity levels and increased ozone levels were associated with DED, after controlling for known risk factors such as sex, dyslipidemia, thyroid disease, subjective health awareness, and previous ocular surgery. "These results, however, are just associations and do not definitively indicate a cause-and-effect relationship between DED and outdoor air pollution." PM10, one of the leading public health issues, was not associated with DED. The authors speculate that possible explanations for this finding is that reflex tearing might help flush PM from the ocular surface, or that environmental PM10 levels currently in Korea are not high enough to induce adverse effects on the ocular surface. ###

One thought on “Claim: Higher ozone, lower humidity levels associated with dry eye disease”

  1. More Liberal Buul Shit , don’t they know how to use Google Search?

    Chronic Dry Eye (CDE) disease can occur in anyone, but people 50 years of age or older are at greatest risk of developing it. While Chronic Dry Eye is more common in women, it also occurs in men.

    In many people, Chronic Dry Eye can be caused by or associated with:
    Growing older

    Chronic Dry Eye disease is more common in people 50 years of age or older

    Hormonal changes

    Chronic Dry Eye disease is associated with hormonal changes, which are very common among women who are experiencing menopause or who are postmenopausal


    Chronic Dry Eye disease may involve inflammation:
    Inflammation may affect the glands, which can decrease tear production
    Inflammation can also affect the glands’ ability to create and maintain the lipid layer, or top layer, of the tear film. The lipid layer slows tear evaporation

    Other conditions

    Chronic Dry Eye may be associated with other eye or health conditions. Some of these include:
    Rheumatoid arthritis
    Sjögren’s syndrome

    External conditions that can aggravate Chronic Dry Eye symptoms

    Certain external conditions can aggravate symptoms of Chronic Dry Eye (CDE). These include:

    Pollen and allergies
    Dry air or wind
    Dust or smoke

    Working on the computer
    Wearing contact lenses

    The only way to find out if you have Chronic Dry Eye is to talk to your eye doctor. He or she can examine your eyes and review your options.

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