Description of the data source, numerator, denominator, survey questions, and other relevant details about the national estimate.
From the 2005-08 National Health and Nutrition Examination Survey:
Measure of visual acuity of left and right eyes with usual correction at examination.
Measure of reported visual acuity of left and right eyes after objective auto-refraction.
For survey participants aged 12 years and over, NHANES measures distance visual acuity, including the eyeglass or contact lens prescription for persons who use help for distance vision. Visual acuity in a given eye was measured at 20/20, 20/25, 20/30, 20/40, 20/50, 20/60, 20/80, 20/200, or over 20/200.
“Usual correction” includes eyeglasses, contacts, eyeglasses and contacts, or no correction depending on what the sample persons wore (or brought with them) to view distant objects on the day of their visit to the mobile examination center. Objective refraction to allow the eye to see 20/25 or better was performed on persons whose presenting visual acuity was 20/30 or worse in their better eye.
This Indicator uses Age-Adjustment Groups:
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