Journal article

THE DURATION OF NORMAL VISUAL EXPOSURE NECESSARY TO PREVENT FORM DEPRIVATION MYOPIA IN CHICKS

GA NAPPER, NA BRENNAN, M BARRINGTON, MA SQUIRES, GA VESSEY, AJ VINGRYS

VISION RESEARCH | PERGAMON-ELSEVIER SCIENCE LTD | Published : 1995

Abstract

The aim of this study was to determine the minimum daily period of exposure to normal visual stimulation required to prevent occlusion induced myopia in chicks. Chicks were treated with monocular translucent occlusion in a 12 hr light/12 hr dark cycle. Occluders were removed for 0 (constant occlusion), 15, 20, 30, 40, 60, 75, 90, 120, 150, 240 or 720 (no occlusion) minutes each day for either 2 or 3 weeks. Fellow eyes and the eyes of normal chicks (bilaterally unoccluded) were used as controls. Occlusion-induced myopia and axial elongation were found to decrease significantly (P < 0.01) with increasing daily exposure to normal visual stimulation. Application of a time series equation to the ..

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