Yes, I have monthly sputum analysis. The level of MAC seen is decreasing from 4+ to “ few”. I am stopping my Aerobika use to see if that has been causing the blurry vision ( ie the increased pressure when exhaling forcefully may cause some adverse effects on the retina.) Recently, I do not produce anything but small amounts of clear mucus no matter how hard I exhale. ( I have never done any of the Forced Expiration Capacity measurements because of risk to my eyes ). I would be interested to learn if others have had any such issues with the use of Aerobika. My eye situation is pretty tenuous ( I have very high myopia, corrected with eyeglasses, etc over the years but have had many of the associated troubles ie severe glaucoma with a central scoot a in one eye now, retinal detachments, cataracts, very dry and oedematous corneas, etc which my opthalmologists have managed over the years). I do not want to risk further vision loss but I realize using Aerobika for the MAC is important. I am sure many others with MAC have had to make risk benefit decisions as well.