Your post prompted me to register here to post my thoughts because to me it sounds exactly like what I experienced with that bear. Had we not seen it feet away from us when we unzipped the tent door, it would have been nothing but eyes reflecting back at us. When he was in our camp he would stand on his hinds and he was scary tall when he did that. So off in the bushes, we would see eyes really high in the air sometimes, and I know why that is. When we were running out of firewood during the night as we took turns keeping watch, the fire provided barely any light and yet those eyes were still reflecting, which I guess must be just the star/moonlight. The fur is so black, that the body is basically impossible to make out.
Kind of crazy to add, when we tried to scavenge more firewood at night, one of us tried to climb a tree with dead branches up higher on the perimeter of our camp with another person below keeping lookout. The bear tried to move on them when he was up in the tree. Everyone that backpacks will say that black bears are skittish and easy to spook. Ours was quite aggressive.