1. Screening of pre-school children for ocular anomalies;Oliver;Br J Ophthalmol,1971
2. Vision of young children;Lippman;Arch Ophthalmol,1969
3. Preschool visual acuity screening tests;Friendly;Trans Am Ophthalmol Soc,1978
4. Clinical assessment of visual acuity;Parr;Trans Ophthalmol Soc NZ,1981
5. Binocular fixation pattern;Zipf;Arch Ophthalmol,1976