Did we not live without sunglasses and light bulbs for 100,000 years? What if we all started wearing sunglasses tomorrow, everyone, everywhere. Would not evolution start to modify our eyes because of it? Yes it would take 20 generations, but something you start to come of it.
Reminds me of the Morlocks from Time Machine, being sensitive to light. You can become a Morlock...I'll be up above with Weena =)