Medicine and the law. Opticians and competition.
D000328:Adult; D000367:Age Factors; D002648:Child; D004465:Economic Competition / Q000331:legislation & jurisprudence; D005139:Eyeglasses / Q000191:economics / Q000592:standards*; D006801:Humans; D009907:Optometry / Q000191:economics*; D012306:Risk; D006113:United Kingdom; D014481:United States; D014787:Vision Tests