Actually , after doing a bit of figuring , it ' s actually the opposite . Things get exponentially harder to see , the farther you are from them . Imagine that your vision is a sphere . If you look out at something that ' s exactly 1 Pathfinder square , it takes up a certain amount of your vision ' s surface area . Which should really be represented by arcs , but can be thought of with no error as percentage of the sphere ' s surface area that ' s covered . If you move the object 10 times farther away , you are effectively multiplying your sphere ' s radius by 10 . The surface area of your vision sphere is now 100 times greater than it was before , however . I ' m tired , but I ' m a bit boggled how this should really work . If anything , past 100 feet , the Pathfinder system is actually being a bit gracious in its vision penalties . It ' s just that perception DCs should probably be much , much lower than they currently are .