Temporini, E.R. (1977) “ The validity of the visual acuity screening in school children carried oat by the teacher - comparative study of the visual acuity measurement by the teacher and the ophthalmologist from the city of S. Paulo, Brazil ”, Revista de Saúde Pública, 11(2), pp. 229–237. doi:10.1590/S0034-89101977000200007.