Your message must have come in as I was looking at the link and responding.

Thank you so much for the info. Its amazing how hard it is to find that out. I am very sensative to altitude changes. I feel the pressure change several times traveling from sea level to 2000ft. Same with elevators. Forget swimming.

Anyway....I can deal with pain and discomfort, I just didn't want to do any permanent damage. (Cuz, just between us, I think there already is some damage there, although nothing yet shows up on tests. In 18 mos, I've probably had a total of 40 days with clear vision. Yet no ON has been found. Goofy.)