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The optimal time to begin treatment for amblyopia is before kindergarten, typically between the ages of 3 and 5. Early intervention is crucial as this is a critical period for visual development. During this age, the brain is more adaptable and receptive to treatment, which can enhance the likelihood of restoring normal vision. The earlier amblyopia is addressed, the better the potential outcomes, as untreated amblyopia beyond early childhood can lead to permanent vision impairment.

Beginning treatment after kindergarten or at the onset of school might delay necessary interventions, reducing the effectiveness of treatments such as glasses, patching, or other therapies designed to strengthen the weaker eye. Waiting until after age 6 or stating that it does not affect vision after age 10 disregards the importance of treating amblyopia early. If not managed swiftly, the brain may become less capable of adjusting, leading to long-term consequences for visual acuity and depth perception.