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WEDNESDAY, Oct. 15 (HealthDay News) -- People with a thyroid disorder run an increased risk of developing the eye disease glaucoma, a new study suggests.
In fact, those with glaucoma are 38 percent more likely to have had a thyroid condition at some point in their life, said the study authors, from the University of Alabama at Birmingham. Glaucoma is the leading cause of irreversible blindness worldwide.
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"Studies like this are very useful in understanding what causes this disease," said lead researcher Gerald McGwin, vice chairman of the Department of Ophthalmology at the university's School of Medicine.
"If we can determine that thyroid problems are related to glaucoma, then we can make some hypotheses about what the mechanism behind that relationship might be and help us understand what might be the cause of glaucoma," McGwin said. "And that may lead to more effective treatments or preventive measures."
The findings were published online Oct. 16 in the British Journal of Ophthalmology.
For the study, McGwin's team collected data on 12,376 people who participated in the 2002 National Health Interview Survey. They were asked if they'd ever been diagnosed with a thyroid problem or glaucoma. Slightly more than 4.5 percent said they had glaucoma, and 12 percent said they had been diagnosed with a thyroid problem.
Among people who had glaucoma, 6.5 percent said they had a thyroid problem, while 4.4 percent said they'd never had a thyroid condition.
People with thyroid problems should see an ophthalmologist or make their ophthalmologist aware of their thyroid condition, McGwin advised. "Somebody who has a history of thyroid problems and has not seen an ophthalmologist may have a heightened level of concern about their eyesight," he said.
The thyroid produces hormones essential for the functioning of every cell in the body; these hormones help regulate growth and chemical reactions.
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