This question concerns spell effects that appear to produce poor visibility and by extension hamper movement. Blindness, darkness and poor visibility hamper movement. Blindness is a condition while darkness and poor visibility are environmental. Blindness and darkness appear self-explanatory - in one you cannot see and the other you need darkvision to see within. Poor visibility is the most poorly defined of the two environmental conditions, leaving me to believe it entails atmospheric effects (fog, heavy rain, snow, smoke and chiefly conjuration based spell effects that recreate such conditions.) So, does a spell effect that produces a condition that limits all vision beyond five feet in addition to rendering all adjacent squares partially concealed due to impaired vision qualify as poor visibility and therefore hamper movement via the appropriate penalty table? Moreover, if not, in terms of game mechanics, excluding an appeal to the already obvious qualities of blindness and darkness, how would one apply the term poor visibility in a meaningful way? Also, since PF allows accelerated movement while blinded at the cost of an Acrobatics check, would'nt areas of poor visibility also be allowed a similiar check to negate the hampered movement penalty?
