The use of spectacles in Denmark and England: the Danish National Morbidity Survey of 1950: communication No. 20.
D003142:Communication; D003718:Denmark; D004739:England; D005139:Eyeglasses / Q000706:statistics & numerical data*; D006801:Humans; D014785:Vision, Ocular
EYEGLASSES; EYEGLASSES/statistics; VISION