1. Committee on child health services. Fit for the future. Cmnd. 6684,1968
2. The problem of screening children for visual defects;Ingram, R.M.;Br J Ophthalmol,1977
3. Pre-school visual acuity screening tests;Friendly, D.S.;Trans Am Ophthalmol Soc,1978
4. Vision screening in the under S's;Hall, S.M.; Pugh, A.G.; Hall, D.M.B.;Br Med J,1982
5. Controversy in the detection of disease;Sackett, D.L.; Holland, W.W.;Lancet,1975