Not too long ago, the patching was all day, but more recently, it has been restricted to 3-6 hrs a day.In the majority of cases this does produce visual improvements, though there is a great deal of variability.The end result after 6 months to 2 years of patching is certainly improved function in the majority of cases, but once the patch is removed the two eyes often don't work together as they should, 3D vision is often not obtained and the fellow eye suppresses the amblyopic eye, which eventually leads to some reduction in acuity.