References
- Hall DMB, editor. Health For All Children, 2nd ed. Oxford: Oxford University Press, 1992:9.
- Cochrane A, Holland W. Validation of screening procedures. Br Med Bull 1969;27:3–8.
- Pickert N, Wach H. Stimulus and communication demands of visual acuity tests. Am J Optom Physiol Opt 1980;57(12):875–80.
- Fern K, Manny R. Visual acuity of the preschool child: a review. Am J Optom Physiol Opt 1986;63(5):319–45.
- Tommila W, Tarkkanen E. Incidence of loss of vision in the healthy eye in amblyopia. Br J Ophthalmol 1992;65:575–7.
- Hilton AF, Stanley JC. Pitfalls in testing children's vision by the Sheridan Gardiner single optotype method. Br J Ophthalmol 1975;56:135–9.
- Pratt-Johnson J, Tillson G. Management of strabismus and amblyopia, a practical guide. New York: Thieme Medical Publishers; Stuttgart & New York: Georg Thieme Verlag, 1994:79.
- Sonsken P. The assessment of vision in the pre-school child. Arch Dis Child 1993;68(4):513–6.