Hello!
Welcome back Cod.
Amazingly glad your hot tub is working well and it's great your eye adventure turned out for the best.
So... as a long time sufferer from myopia I've been wearing contactlenses for pretty much my entire adult life.
I've had a set become so contaminated with calcium deposits (Your tears contain a tad more than just saline) you could see the little nodules inside the plastic.
I've had a spot of rust devlope with said plastic membran (The Optometrist preserved and framed that one. Yup... your tears can even contain cast offs from your blood etc.)
Working in a processing fascility. I've had a drop of oil flic out of the machine, *
Blick*, seemingly right into my left eye and I've back away blinking with seeming no ill effects thinking, "Gee. That was lucky." Couple weeks later back to optometrist because of discomfort in the lenses.
Pull them out. Minor caclium build up in/on/with the right lense. A naffy, star shaped 'Splat' pattern right across the left lense.
"Ah. Thre's your problem."
So...
realy glad your eye adventure turned out for the best. It could, as you're ware, turned out for thw orst.
Much cheers!
Not at work.