I have been wearing contacts for almost 30 years and I have never had an issue with them while riding. I am really blind, too. The dryness was definitely a problem in the climate in Phx. But, that was back before they had contacts with a high water content. I suggest you look at Accuvues; I wear the kind that last for 2 weeks. You can keep them in overnight, but I don't. I don't even remember they are in.
My issue is now that I am old, I wear reading glasses over my contacts. I can still see my bike computer, but I am dreading the day when that gets blurry!