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Amblyopia is a childhood problem that happens when one eye is weaker than the other. The brain chooses to take in images from the stronger eye and ignore images from the weaker eye. This means that your child uses the strong eye more than the weak eye. If the weak eye doesn't have to work, it isn't able to develop good vision. This leads to poor vision in the weaker eye.
Amblyopia usually affects only one eye.
The problem starts between birth and about age 7. Your child may not even know that he or she is using only one eye. Ignoring the images from the weak eye is an automatic response. Your child has no control over it.
Early treatment usually can reverse amblyopia. The younger your child is when treatment starts, the more likely your child is to have good vision.