The roads were nearly empty but low visibility made driving treacherous.
The visibility of a star is a question of brightness simply, and has nothing to do with resolving power.
Even if it hadn't been dark, visibility would have been less than a few feet.
She applied the brakes and the dust cloud caught up, cloaking the road so thickly that visibility was down to the front of the car.
Mill has shown that in the North Sea off the Firth of Forth the average depth of visibility of a disk in the winter half-year was 4; fathoms and in the summer half-year 62 fathoms, and, although the greater frequency of rough weather in winter might tend to obscure the effect, individual observations made it plain that the angle of the sun was the main factor in increasing the depth to which the disk remained visible.