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Refractive errors affect vision for half of american adults
Written by NetDoc.com Medical News Feed   

CHICAGO—About half of U.S. adults age 20 and older have refractive errors and may need eyeglasses, contact lenses or refractive surgery to maximize their visual acuity, according to a report in the August issue of Archives of Ophthalmology, one of the JAMA/Archives journals.

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Refractive error accounts for nearly 80 percent of vision impairment in U.S. residents 12 years and older, according to background information in the article. It occurs when the eye cannot focus light because of nearsightedness, farsightedness or astigmatism, an irregular curve of the eye’s cornea. Providing eye care to individuals age 12 and older who need glasses or contacts is estimated to cost between $3.8 and $7.2 billion per year.

Susan Vitale, Ph.D., M.H.S., and colleagues at the National Eye Institute, Bethesda, Md., analyzed data from the National Health and Nutrition Examination Survey (NHANES), an ongoing nationally representative survey conducted by the Centers for Disease Control and Prevention. Demographic characteristics were collected during in-person interviews and a vision examination was conducted.

Among 12,010 participants age 20 and older who completed the survey between 1999 and 2004 and had complete data available, about half had some type of refractive error. This included 3.6 percent who were farsighted, 33.1 percent who were nearsighted and 36.2 percent who had astigmatism. The researchers also found that:

  • Nearsightedness was more common in women (39.9 percent) than in men (32.6 percent) among 20- to 39-year-olds
  • Individuals age 60 and older were less likely to have nearsightedness and more likely to have farsightedness and astigmatism than younger participants; in the older age group, men (66.8 percent) were more likely to have refractive error than women (59.2 percent)
  • Mexican-Americans were less likely to have any type of refractive error (44.4 percent) than were non-Hispanic whites (53.4 percent) or non-Hispanic blacks (49.3 percent)
  • The prevalence of any refractive error increased with age, from 46.3 percent among those age 20 through 39 to 50.6 percent among those age 40 through 59 and 62.7 percent among those age 60 and older

 

“Refractive error is, therefore, the most common condition affecting the ocular health of the U.S. population, involving young adults, middle-aged persons and older adults of all ethnicities,” the authors conclude. “Accurate, current estimates of the prevalence of refractive error are essential for projecting vision care needs and planning for provision of vision care services to the many people affected.”
(Arch Ophthalmol. 2008;126[8]:1111-1119.

Editor's Note: The NHANES is sponsored by the National Center for Health Statistics, Centers for Disease Control and Prevention. Additional funding for the NHANES Vision Component was provided by a National Eye Institute, National Institutes of Health, Intramural Research Program grant. Please see the article for additional information, including other authors, author contributions and affiliations, financial disclosures, funding and support, etc.

For more information, contact JAMA/Archives media relations at 312/464-JAMA (5262) or e-mail mediarelations{at}jama-archives.org .

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