Blind Fight Feat

Blind-Fight
You know how to fight in melee without being able to see your foes.
Benefit: In melee combat, every time you miss because of concealment, you can reroll your miss chance percentile roll one time to see if you actually hit (see Concealment).

You take only half the usual penalty to speed for being unable to see. Darkness and poor visibility in general reduces your speed to three-quarters of normal, inside of one-half (see Hampered Movement).