I think a copper tinted lenses help with spotting fish and birds. For deer I only wear them if the sun is in my face, even with anti reflective coatings I have been busted by the reflection of the lenses. The copper color helps in spotting a blood trail. I have found spotty blood trails I had missed when not wearing the glasses after I back tracked with them on.

"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli