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Could Depression Make Dry Eye Worse?

HealthDay News
Updated: Mar 14th 2022

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MONDAY, March 14, 2022 (HealthDay News) -- When people have both chronic dry eye and depression, their eye symptoms may be worse, a new study finds.

Researchers said the exact nature of the link is not clear: Does depression affect the severity of dry eye disease? Or do particularly troublesome eye symptoms feed depression?

But the gist, they say, is that depression and severe dry eye can be connected, and patients and health care providers should know that.

Dry eye is very common, affecting around 16 million Americans, according to the U.S. National Eye Institute. But the condition ranges widely in its severity: Many people have milder dry eye -- from staring at computers all day, for example -- and it can be managed with over-the-counter eye drops and frequent screen breaks.

Other people have severe symptoms, sometimes associated with certain autoimmune conditions, like Sjogren's syndrome and rheumatoid arthritis.

Past studies have shown that people with chronic dry eye have a higher-than-average rate of depression. The new study -- published March 10 in JAMA Ophthalmology -- shows a correlation between depression and more-severe dry eye symptoms and signs.

Researchers found that of 535 adults with dry eye disease, those who screened positive for depression generally had worse eye symptoms throughout the one-year study.

What the study cannot say is why, noted senior researcher Gui-shuang Ying, of the University of Pennsylvania Perelman School of Medicine in Philadelphia. The relationship could go in either direction, he said.

For example, it's easy to see how severe dry eye symptoms could affect people's mental well-being, said Yi Zhou, a medical student at Penn who also worked on the study.

"On the other hand," Zhou said, "there are studies suggesting that people with depression may have changes in how they perceive pain."

Depression can also have a major impact on lifestyle habits. If a person with depression is spending more time in front of TV and computer screens, for example, that could worsen dry eye symptoms, the researchers said.

Then there's a third possibility: Shared underlying factors might contribute to both depression and dry eye disease, said Dr. Anat Galor, of the Bascom Palmer Eye Institute at the University of Miami.

For now, all of those scenarios are on the table. And it's unclear whether treating dry eye disease can help ease depression, said Galor, who wrote an editorial published with the findings.

What's important, she said, is that when a person with dry eye disease also has depression, both conditions are addressed.

Galor said she does ask her patients with dry eye disease about their mental well-being, but that is not standard. She suggested that patients who have mental health concerns talk to their health care provider.

The findings are based on 535 dry eye patients enrolled in a clinical trial testing omega-3 fatty acid supplements for easing the condition. At the outset, and 6 and 12 months later, the participants completed standard mental health questionnaires. Anywhere from 13% to 17% of patients screened positive for depression at one of those time points.

Overall, there was a correlation between depression and more severe eye symptoms -- even after the researchers took some other factors into account, such as whether patients had autoimmune disease.

Many medications, including antidepressants, can have dry eye as a side effect. But in this study, there was no link between antidepressant use and dry eye severity -- only depression itself.

One question is whether inflammation could be a culprit, since inflammation has been implicated in the disease process of both dry eye and depression.

The researchers were able to delve into that by looking at markers of inflammation in study patients' tear samples: They did not find any correlation between depression and those inflammatory markers.

However, Zhou said, that does not discount a role of inflammation. It's still possible that systemic inflammation, rather than inflammation at the eye's surface, could help explain the connection between depression and severe dry eye.

Whatever the mechanisms, the findings highlight a connection between dry eye severity and mental well-being. And it's important for health care providers to be aware of it, the researchers said.

If, for example, a patient's dry eye symptoms are worse than the clinical signs of the disease, it might be appropriate to do a mental health screening, Zhou said.

The study was funded by the U.S. National Institutes of Health.

More information

The American Academy of Ophthalmology has more on dry eye.

SOURCES: Gui-shuang Ying, PhD, professor, ophthalmology, University of Pennsylvania Perelman School of Medicine, Philadelphia; Yi Zhou, BA, medical student, University of Pennsylvania; Anat Galor, MD, MSPH, professor, ophthalmology, Bascom Palmer Eye Institute, University of Miami; JAMA Ophthalmology, online, March 10, 2022