Using service area analysis, we demonstrate nearly all Americans live within an accessible distance (i.e., 60 minutes) of an ophthalmologist and optometrist; we also characterize the geographic areas that remain without facile access to care.

中文翻译：

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美国眼科护理的地理分布


通过服务区域分析，我们证明几乎所有美国人都居住在眼科医生和验光师可到达的距离（即 60 分钟）内；我们还描述了仍然难以获得护理的地理区域。