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It's entirely possible that some humans can see ultraviolet light after eye surgery. Monet is a classic example. After having cataracts removed, he went back and repainted some of the same scenes, which were now bluer than before.
Deer can be funny animals. I've spooked them 200m away sometimes, and at other times been able to get within 20m of them. If you sit perfectly still and are downwind, they can walk right past you. It may be that without motion they can't really tell what you are.
But one thing is for sure, they are damn tasty.
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