Can I fix a scratched iPhone 5 rear camera lens?
don’t do it your self at first! go to an Apple Store and let it check, maybe it’s just a hair!
Well i think you can do it
Lens - http://www.witrigs.com/replacement-camera-lens-for-iphone-5
Video on howto do it - http://www.youtube.com/watch?v=Si0M3wak4Q0