The treatment needs to happen as soon as possible, if the difference in the vision between the two eyes is caused by a squint, a cataract, high Myopia, Astigmatism or hyperopia these need to be corrected as soon as possible. Patching the eye that has clear vision for a few hours per day will force the brain to acknowledge and therefore use the poor eye, therefore improving development in that eye. Since amblyopia is a developmental problem, it needs to be sorted out during developmental years, if left uncorrected, vision cannot be regained.