I think I read somewhere....and I'd appreciate it if someone would set me straight about this......that a deer sees "close" to 300deg.....meaning the only place they're NOT looking (when looking straight ahead) is directly behind them.

I'm also certain they'll smell you LONG before they'll see you in most HUNTING scenarios....and their best defense would be with their nose in the wind.

Edit: Also mobo (and I think this is interesting...this conversation).....a deer's ears are always moving around it seems, to me. "I" think they could turn them to block out the wind if it were a detriment (the noise in their ear) to their safety. I could be wrong....but I know they can turn them about any direction they want to!....

I thought this would be good to know and I looked it up to see what I could find out. You are correct. These folks describe vision in a little more detail but the verify what you are saying.

Deer Vision
Whitetails have much better dim-light vision than humans. A human's retina is dominated by cones (color receptor); a deer's, rods (light receptors). Rods are about 1,000 times more sensitive to light than cones. A deer's retina also has a layer of reflective pigment, called the tapetum. If light passes through the retina without activating the rods, the tapetum bounces it back for a second chance. In addition, the pupil of deer opens much wider than that of the human, gathering about 9 times more light. These adaptations result not only in better vision in dim light or darkness, but also in better peripheral vision and motion detection. The whitetail's habit of standing still when alarmed also helps them detect motion. But deer don't see as clearly as humans, especially at long distances. They're usually unable to identify a motionless hunter. The whitetail's eyes are on the side of the head, an adaptation which also promotes peripheral vision. Each eye scans nearly 180 degrees, meaning deer can spot movement everywhere except directly to the rear. Looking forward, they have binocular vision in good depth perception over a span of 90 degrees; to the side, monocular vision and poor depth perception. Although whitetails have some cones in their retina, their ability to see broad spectrum of colors has never been proven. One study, however, determined that deer can distinguish a fluorescent color from the same nonfluorescent color.

http://www.bowhunts.com/deer2.html

What he said. If deer always walked into the wind they would all be in Canada by now. They only walk up wind if they have a reason to sent check somthing, or if happens to be blowing from a direction that they wanted to go in the first place.