Not to detract from mudmonsters experiences but I found their after sales to be exceptional. The first pair they sent me gave me headaches and did have lots of distortion, they replaced them for a completely different pair free of charge, then that pair needed bending to fit my head a few times and the glasses went backwards and forwards a number of times. When I pointed out the cost of the postage they sent me a cheque immediately. I was very happy with them.
However, since then disposable contact lenses have finally reached my crazy assed prescription so now I just fit a pair and wear a twenty quid pair of rather natty cycling glasses which I can take off if it gets dark and if I break them, well that's a pity but never mind.
Much better option if you can take it IMO.