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There was a good study published recently documenting the ability for patients with eye surgery who could see into the UV spectrum.

The cornea blocks some UV light so if you have eye correction surgery your cornea is now modified/thinner and you can see slightly into the UV spectrum.

Probably has some downsides too.. Cataracts are probably more probable seeing as people tend to get them more frequently at higher altitude.

The Tibetan people apparently have a high rate of cataracts since there is higher UV light at the higher altitude.

It wasn't the cornea, but an artificial lens that was responsible. [0] UV passed through the artificial lens, but not through our natural one. It was replaced because of cataracts.

[0] http://science.slashdot.org/story/12/02/14/165202/followup-u...

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