hey Trek...
i have bifocal contacts.
no trouble except for drying out occasionally. and when i want to do really close-up stuff, like taking out counted-crosstitch stitches. then i use the cheapy glasses from Costco. (3-pak). also with the contacts, you can still wear the cool-looking 'biker' sun glasses or the clear covers when it's foggy or on the dark side. i do suggest if you are doing off road or lots of (down) hills, to wear some sort of eye protection. i have hadlittle bits of dust get in my eyes, and it feels like a boulder. also had a contact flip out and loose it when the wind got underneath an edge and lift it.
but i love my bifocal contacts....too easy!
soph