I wore contact lenses for 10 years, stopping a year or so ago. I had monthly disposables and would wear them daily from around 8am - 10pm without any major issues (although my eyes did noticeably become dry/tired in the evening it wasn't that serious).

The reason why I stopped was because the lenses started becoming dry quickly and I just couldn't see the screen clearly after wearing them for a couple of hours. Nothing in my computer setup or usage habits changed. I've seen various optometrists, but they couldn't give me a reason why this was happening. They just said if I can see better with glasses, I should do that for computer use :D

I now only wear dailies, but very rarely - usually only if I'm doing sports or swimming (although maybe I won't after reading this article...). Before switching I tried different brands of contact lenses (both monthly and daily), as well as turning down brightness and flux, but they weren't helpful in my case.