I've done HBO twice and did have vision changes both times - mainly distance which cleared up within a few weeks after I finished treatment.

Both times my BP became elevated. High BP does run in my family but mine was normal until after I developed OC. I've been on BP medication for a few years which has kept it in check until I started HBOT. This past time my doctor added another BP medication which helped. I finished the last round of HBOT the end of May and my BP is now back to normal.

I agree with Christine that HBOT does take up a lot of time -- a few hours each day plus travel time to get there. I was treated at 3 different facilities and each had a TV for each chamber. I found bringing my own DVDs a great help to beat the boredom.

Good Luck!!