As someone who wears contacts, I can say that this would quickly become expensive. You would have to replace the lens periodically. Plus it's frustrating to learn how to get the things in. Not everyone can wear them due to astigmatisms (depending on how bad it is and if the lens is made for those with astigmatisms) and eye-moisture level. You have to be able to produce enough tears to keep the lens moist enough to not cause eye irritation. And, let me tell you, those headaches from a dry-ish contact lens sucks...
I'll keep my smartphone screens.