1. A new picture series for preschool vision testing;Allen;Am J Ophthalmol,1957
2. Testing of visual acuity in preschool children: Norms, variables and a new picture test;Allen;Pediatries,1957
3. Visual acuity development in human infants up to 6 months of age;Allen,1979
4. Visual assessment of the multi-handicapped using infant techniques;Allen;Invest Ophthalmol Vis Sci (suppl),1984
5. La vision de l'enfant et sa measure;Ardouin;J Fr Ophthalmol,1978