01653oam 2200469 450 991071363420332120200706081703.0(CKB)5470000002503333(OCoLC)1009338216(EXLCZ)99547000000250333320171104d1963 ua 0engurun||||a|a||txtrdacontentcrdamediacrrdacarrierComparison of two vision-testing devices a study to compare visual acuity as measured by the sight-screener and the Sloan letter chartWashington, D.C. :U.S. Department of Health, Education, and Welfare, Public Health Service,1963.1 online resource (4 unnumbered pages, 33 pages) illustrationsVital and health statistics. Series 2, Data evaluation and methods research ;number 1Public Health Service publication ;no. 1000-series 2-no. 1"June 1963."Includes bibliographical references (page 16).Comparison of two vision-testing devices OptometryUnited StatesVisionTestingOptometryfastOptometryVisionTesting.Optometry.United States.Public Health Service.National Center for Health Statistics (U.S.),OCLCEOCLCEOCLCOOCLCAOCLCQGPOBOOK9910713634203321Comparison of two vision-testing devices3541616UNINA