There is not much research on PVD, it is part of aging, only a tiny fraction of PVDs cause visual problems, there are so many other diseases (e.g. macular degeneration, glaucoma, diabetic retinopathy) that cause blindness and are much more researched. There is a limited amount of time, money and trained researchers to vision threatening is top priority. All I read it the doctor's bio and he is well trained. If you are talking about a 'floater only vitrectomy' that is something I have never recommended to my patients. Too risky