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(A) A colored high-contrast cartoon target. (B) A photorefractor image from a 2.2-year-old subject taking part in the binocular condition (top panel) and in the monocular condition (bottom panel). The right eye was occluded in the monocular condition using an infrared Wratten #87 filter mounted on an adult-sized spectacle frame. The white arrowheads in the bottom panel of (B) indicate the medial edges of the IR filter. (C) The experimental equipment. The core components are labeled.
