"She is also an amblyope. One eye has an acuity that is at least two lines on the Snellen Eye Chart worse the other eye. This is probably why she is not binocular - she opted to pay attention to the information coming into her brain from just one eye - actually, she did not do this on purpose, it just happened and therefore she does not experience double vision. You need two eyes to point to the same place in space AT THE SAME time in order to experience three-D vision."
Can Too! Read: Hope for an amblyope: