Kat,
Like said above they can definatly see well at night, BUT normally I think they feel safer after dark and are not quite as "ready to bolt" My advice from my expirience is to walk directly to or from your stand at a steady pace, no stopping to look around. Almost make it like you know you are being watched. Just go. I have to cross an open field to get to my favorie stand, I have seen countless deer on the way in and out and even killed a few of them. I have found that if you hesitate your stride, they become extremely alert. Its kinda hard to explain, but I have walked out within 40 yards or less over the years of several deer at once without spooking them. They watched my every step and stayed frozen the whole time, but I didnt stop to observe. Curiosity I think will sometimes get the best of them.
Sometimes a face off is unavoidable in a situation like crossing an open field, just try to be as natural, and preoccupied (if that makes any scence) as you can. I have tried the bent over approach, and get busted everytime. Its not natural.
This is just from my expirience, I do alot of hunting 5 - 6 days a week during bow season. So take it from there.
Pat