Trends in eye care.
D000329:Advertising / Q000331:legislation & jurisprudence; D003695:Delivery of Health Care / Q000639:trends*; D006279:Health Maintenance Organizations / Q000639:trends; D006801:Humans; D008484:Medicaid; D009881:Ophthalmic Assistants; D009885:Ophthalmology; D009907:Optometry; D013038:Specialization / Q000639:trends; D014481:United States