Amblyopia results from chronic blurring of visual images during development

Atropine was instilled daily into either one or both eyes of developing kittens from the time of eye opening until 3.5 months of age. Visual acuity was assessed after recovery from the acute effects of atropine. Both binocularly and monocularly treated kittens showed a loss of acuity in the treated eye(s), and an improvement in acuity when tested binocularly.