Accommodative-convergence in young infants: Development of a synergistic sensory-motor system.

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Abstract
Binocular eye alignment was measured in 2- to 6-mo.-old infants under both binocular and monocular viewing conditions. Corneal photography was used to assess whether infants converged to a target presented at a 15 cm viewing distance. Infants at all ages, including the youngest age tested (8 wk), showed reliable convergence under both binocular and monocular viewing conditions. The presence of convergence during monocular viewing indicates that an accommodative-convergence link is present at an early age. The implications of this early synergistic relationship between accommodation and convergence are discussed both with respect to the influence of early visuomotor experience on the developing visual system and the onset of various ocular anomalies during infancy.

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