All through the 80's I used contacts with no troubles. They were semi-hard ones because that was what was available.
I would have thought daily disposable contacts would minimise the risk of infection. Google says otherwise with all the advice being to not use contacts in the water due to the risk of abrasion or infection.
I had laser eye surgery in 1995 and that fixed my eyes for good. I still have better than 20:20 distance vision. Close up is pretty crap but that's what happens when you get old.
Lips sunglasses are about the best available and they do prescription lenses. They are likely super expensive, but so is kite gear. My favourites are the photochromic lenses.
www.lip-sunglasses.com/prescription/