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2. Criteria for monocular acuity deficit in infancy and early childhood;Birch;Investigative Ophthalmology and Visual Science,1988
3. Monocular grating acuity of healthy preterm infants;Birch;Clinical Vision Sciences,1991
4. Operant acuity of toddlers and developmentally delayed children with low vision;Birch;Journal of Pediatric Ophthalmology and Strabismus,1987
5. Visual acuity in newborn and preterm infants measured with grating acuity cards;Brown;American Journal of Opthalmology,1986