How well do deer see in the dark?

Better than any of us do.
Our eyes are more geared for color, and less of night vision. Deer is kinda the opposite, they dont see all the colors we can see, however their eyes are built to bring in light at night, which helps them see better in the darkness. Thats why their eyes "light up" at night when a light shines in their face.

I know if you move around in your stand in the daytime you won't kill many deer, however right at dark-thirty when you can barely make out the deer in the field you can move around some without being detected.