Camo is not required, at least not in the sense that you can't kill a deer without it, because you certainly can. It does help though. Hunting conditions vary; what may be a big help when hunting in the woods may not be as important if you’re hunting by shooting 300 yards across a beanfield.
The order of perception in deer is: Scent, movement, vision. Camo doesn't deal with scent and while it helps make movement harder to detect, if you move a deer will still probably see it.
It may seem silly to wear camo and an orange vest and it would be silly if a deer's vision worked like a human's.
But deer do not see the world the way humans do. Their eyesight is not a sharp as a humans and they perceive color differently. They do not differentiate between red, orange and green like we do. They see leaves as yellow brown. They see a blaze vest as a yellow blob.
This has been very well established:
http://www.northcountrywhitetails.com/articles/whatdodeersee.htm
http://www.wildlifetimes.com/forums/viewtopic.php?t=93
http://www.shamancamo.com/research.htm
http://www.youtube.com/watch?v=DNe2PB3CSnA
So if you wear a blaze vest over camo, you will be visible to humans (good) but hard to see to deer (also good). If you hunt in areas where there are lots of hunters you might want to consider wearing a solid blaze vest to satisfy the law over blaze camo clothing for concealment from the deer.
The order of perception in deer is: Scent, movement, vision. Camo doesn't deal with scent and while it helps make movement harder to detect, if you move a deer will still probably see it.
It may seem silly to wear camo and an orange vest and it would be silly if a deer's vision worked like a human's.
But deer do not see the world the way humans do. Their eyesight is not a sharp as a humans and they perceive color differently. They do not differentiate between red, orange and green like we do. They see leaves as yellow brown. They see a blaze vest as a yellow blob.
This has been very well established:
http://www.northcountrywhitetails.com/articles/whatdodeersee.htm
http://www.wildlifetimes.com/forums/viewtopic.php?t=93
http://www.shamancamo.com/research.htm
http://www.youtube.com/watch?v=DNe2PB3CSnA
So if you wear a blaze vest over camo, you will be visible to humans (good) but hard to see to deer (also good). If you hunt in areas where there are lots of hunters you might want to consider wearing a solid blaze vest to satisfy the law over blaze camo clothing for concealment from the deer.