There are too many variables that affect eye health to list in one discussion, but we can say that some of those variables may influence the overall success of the vitreolysis procedure. Studies indicate that the treatment may achieve 60 to 90 percent improvement with one session. Some people may require one or more additional treatments to achieve optimal results. Very few patients fail to see improvement after vitreolysis. Those who do are usually under the age of 40 and have very thin floater material.