SAN FRANCISCO - October 1, 2012 - People who take statins to reduce their risk of cardiovascular disease are less likely to be diagnosed with the most common form of glaucoma, according to a nationwide study of more than 300,000 patients. A University of Michigan School of Medicine research team, directed by Joshua Stein, MD, MS, found that the risk for glaucoma was reduced by eight percent in patients who took statins continuously for two years, compared with patients who did not take statins. The study, the largest to date on the topic, is published in the October issue of Ophthalmology, the journal of the American Academy of Ophthalmology.
Dr. Stein's study was sparked by growing evidence that statin use may protect the optic nerve and retinal nerve fibers, structures that are essential to good vision and are damaged by glaucoma. His team used healthcare claims data for a diverse population of Americans aged 60 and older who took statins to control high blood levels of unhealthy fats, a condition known as hyperlipidemia, between 2001 and 2009, The researchers assessed patients' risk for open-angle glaucoma (OAG). Unlike earlier studies, their analysis adjusted for patients who also had diabetes and/or hypertension to prevent distortion of the results.
Several of the study's findings suggest that statin use may be most important before glaucoma is diagnosed, or in the early stages of the disease. Dr. Stein's research may lead to new preventive treatments that could especially benefit groups at increased risk, including African-Americans, Hispanics and those with a family history of glaucoma.
Glaucoma affects more than 2.7 million Americans age 40 and older . If untreated, glaucoma causes vision loss or blindness by damaging the eye's optic nerve. The optic nerve sends signals from the retina -- a layer of light-sensitive tissue at the back of the eye -- to the brain, where these signals are interpreted as the images we see. Only about half of the people who have glaucoma know it, since symptoms are rarely noticed in the early stages and vision loss is very gradual in most cases.
"Statins' apparent ability to reduce glaucoma risk may be due to several factors, including improved blood flow to the optic nerve and retinal nerve cells and enhanced outflow of the aqueous fluid, which may reduce intraocular pressure," said Dr. Stein. "While more research is needed, we hope our results may contribute to saving the sight of thousands who are predisposed to glaucoma."
Dr. Stein cautioned that the study results apply only to patients with hyperlipidemia, and that further study is needed to determine whether statins also protect patients who don't have this diagnosis or have other characteristics that differ from the study population.
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About the American Academy of Ophthalmology
The American Academy of Ophthalmology is the world's largest association of eye physicians and surgeons -- Eye M.D.s-- with more than 32,000 members worldwide. Eye health care is provided by the three "O's" - ophthalmologists, optometrists, and opticians. It is the ophthalmologist, or Eye M.D., who can treat it all: eye diseases, infections and injuries, and perform eye surgery. For more information, visit www.aao.org The Academy's EyeSmart® public education program works to educate the public about the importance of eye health and to empower them to preserve their healthy vision, by providing the most trusted and medically accurate information about eye diseases, conditions and injuries. Visit www.geteyesmart.org to learn more.
Ophthalmology, the official journal of the American Academy of Ophthalmology, publishes original, peer-reviewed reports of research in ophthalmology, including basic science investigations and clinical studies. Topics include new diagnostic and surgical techniques, treatment methods, instrument updates, the latest drug findings, results of clinical trials, and research findings. Ophthalmology also publishes major reviews of specific topics by acknowledged authorities.