Non-working = lazy
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.