There is good evidence that 2 hours of patching a day is as effective as 6 hours of patching for moderate cases of amblyopia (vision between 20/40 – 20/80 or 6/12-6/24). In more severe amblyopia patching for 6 hours per day is usually recommended. It has been shown that full time patching is no more effective than patching for 6 hours per day, even in severe amblyopia.