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Can’t Get Relief from Dry Eye?

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New research from the University of Miami suggests the answer may lie in the way their nervous system reacts to pain. Image for illustration purposes.
New research from the University of Miami suggests the answer may lie in the way their nervous system reacts to pain. Image for illustration purposes.

Mega Doctor News

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By American Academy of Ophthalmology (AAO)

Newswise — NEW ORLEANS, La. – Most of the 16 million Americans diagnosed with dry eye every year get relief with artificial tears or prescription medication, but some people struggle with lingering, severe eye pain despite trying various treatments. New research from the University of Miami suggests the answer may lie in the way their nervous system reacts to pain. This information will help researchers find more effective treatment strategies for a complex condition that appears driven by an interplay of biological, psychological, and social factors. The study will be presented today at AAO 2021, the 125th annual meeting of the American Academy of Ophthalmology.

Dry eye happens when the eye does not produce enough tears, resulting in eye pain, redness, stinging, burning, or blurry vision. Unfortunately, lifestyle changes and commonly used dry eye treatments do not relieve these symptoms in some patients. Even more frustrating, eye exams frequently do not reflect the severe pain these patients experience, making it harder to pinpoint the best treatment.

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To learn more, researchers used a technique called conditioned pain modulation (CPM) to evaluate how the nervous system reacts to pain in people with chronic eye pain. People with a low CPM response experience pain more intensely than someone with a high CPM response. Therefore, researchers assumed that people with chronic eye pain would have a low CPM response, like people who suffer from other types of chronic pain.

However, their evaluation of 296 patients found that people suffering from chronic eye pain demonstrated a normal to high CPM response, suggesting that focusing on the nervous system may help improve treatments for this complex eye condition.

“This study adds to existing literature that shows abnormalities in the nervous system can contribute to painful dry eye symptoms, beyond direct damage on the surface of the eye,” said lead researcher Amy Huang, MD. “Our hope for the future is that with more knowledge and information about the location of the abnormalities, more targeted therapies can be developed to relieve ocular pain symptoms in dry eye.”

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