Any time after i think it is 6:01PM for me, i can hardly see ANYTHING, i can look straight down at the ground & sometimes make out the tile i'm standing on, (sometimes not) but nothing more... I also can see the stars in the sky, but they do not seem to interact with other objects i.e. i cannot use them to navigate because they show through walls etc.
My only real recourse is to use the map, angle myself correctly and then just reopen the map frequently for turns & such... occasionally i'll get stuck on objects like trees & bone piles, (which i cannot see).

But at other times it is relatively clear at night, when i did my mercenary quest i could see almost everything, it was just darker...

I'm not sure it is supposed to be as dark as it is some nights... and the gamma correction must be all the way at the RIGHT side to see *well*, i can see with the gamma set to standard & middle, but not clearly... its so dark it is an eye strain...

Also, the time of day seems to have more to do with my visibility then anything else, even indoors & inside caves, i cannot see anything underground between 6pm & 6am... Which i think is completely retarded, is there any fix for either of these?

I usually just have to rest & wait for 6am & then proceed as normal, some caves I cannot do anything but look at the floor i'm standing on & try to follow wall edges in this manner...