Vision In NHANES

国家健康和营养调查是一项持续的，全国性的，全面的健康调查的平民，非制度化的美国人口。1999年增加了视力评估，目前正在进行。所有年龄在12岁以上的样本人都接受视力评估，其中测量戴远距眼镜的人的近视处方，测试样本人在矫正和未矫正（眼镜/隐形眼镜）的情况下的远视力，并获得客观屈光（还包括对眼睛角膜曲率的评估）。对50岁及以上的人进行近视力评估。此外，还收集了19岁以上人群的视力相关功能测量的个人访谈数据（在2005年之前，这些数据仅收集自50岁及以上人群）。 NHANES中视力部分的数据将用于估计美国人群中视力障碍的患病率，描述美国人群中屈光不正的分布，评估视力丧失对功能能力的影响，并将视力障碍与其他健康和疾病措施联系起来。患病率数据将用作2010年健康人群中视力目标的基线测量。 数据收集正在进行中。视力检查规程已进一步完善，以便更好地评估严重视力障碍的频率，特别是因为它涉及那些因各种原因后来没有参加在移动的单位进行的视力检查的人。 1999年至2002年收集的视力数据于2005年春季由国家卫生统计中心公开发布，用于分析目的。

The National Health and Nutrition Examination Survey is an on-going, national, comprehensive health survey of the civilian, non-institutionalized US population. A vision assessment was added in 1999 and is on-going. All sample persons aged 12+ years undergo a vision assessment in which measures of the eyeglass prescription in people who wear glasses for distance, tests the distance visual acuity of sample persons with and without correction (glasses/contacts) and an objective refraction (incorporating also an evaluation of the corneal curvature of the eye) are obtained. A visual acuity at near is assessed in persons age 50 years and over. In addition, personal interview data on functional measures related to vision are collected on people over the age of 19 years (prior to 2005, these data were collected only from those 50 years of age and older). Data from the vision component in NHANES will be used to estimate the prevalence of visual impairment in the U.S. population, describe the distribution of refractive error in the U.S. population, evaluate the impact of vision loss on functional abilities, and relate visual impairment to other health and disease measures. The prevalence data will be used as baseline measures for a vision objective in Healthy People 2010. Data collection is on-going. The vision interview protocol has been further refined to better assess the frequency of severe visual impairment, particularly as it relates to those who, for various reasons, subsequently do not participate in the vision examination component as conducted in the mobile units. Vision data, collected between 1999 and 2002, were publicly released by the National Center for Health Statistics for analytic purposes in spring 2005.