Binocular visual acuity of children : demographic and socioeconomic characteristic--United States /
Roberts, Jean,1918-
Duyan, Kenneth R.
Rockville, Md., National Center for Health Statistics; [for sale by the Supt. of Docs., U.S. Govt. Print. Off., Washington]
1972.
Includes bibliographical references.
Visual acuity
Vision disorders in children