What causes lazy eye?

Non-working = lazy: Lazy eye refers to several issues that can cause the brain to quit accepting input from an affected eye, so it is not working =lazy. Example: 1 eye presents a sharp image to the brain, 1 a fuzzy image. The brain chooses to keep the sharp image & quit "looking" at the other image. Timed patching of the good eye makes the brain keep using the weak eye. The eye dr works to improve the weak eye.

Genetics: Most lazy eye (amblyopia) is inherited--not directly from the parents often but other family members may have it. Children with a family history of amblyopia or strabismus should be examined at a young age (around 3) as the condition is not always apparent to parents/pediatricians. see also: http://www.aapos.org/terms/conditions/21