Hi Larry ! Funny you mention the low phosphorus. I have been dealing with an incredible amount of kidney stones since I started on the liquid nutrition. Four stone surgery removals since March with more on the way. Last surgery they said there were over 100 still there. One was a massive 23 mm and many at 12 -14 mm which can not be passed. The kidney doctor thinks I am getting way to much phosphorus and oxalate. So, I have been studying what foods I can blend to put through the tube that are low phosphorus and oxalate but high calorie. Sounds like Your ENT Doctor would be a great place to start and yes the RO too. I sure can understand your concern with your eyes and getting HBOT. I read and sew most of my day and eyesight problems would be very devastating to me. I can imagine how scary it would be for you as an artist. I also worry about making any more problems as I am doing so-so right now and thank goodness my teeth do not hurt. Hopefully we can keep in touch and compare notes as we check with our Doctors about HBOT.