Benefits

In melee, every time you miss because of concealment (see Combat), you can reroll your miss chance percentile roll one time to see if you actually hit.   An invisible attacker gets no advantages related to hitting you in melee. That is, you don’t lose your Dexterity bonus to Armor Class, and the attacker doesn’t get the usual +2 bonus for being invisible. The invisible attacker’s bonuses do still apply for ranged attacks, however.   You do not need to make Acrobatics skill checks to move at full speed while blinded.

Normal

Regular attack roll modifiers for invisible attackers trying to hit you apply, and you lose your Dexterity bonus to AC. The speed reduction for darkness and poor visibility also applies.

Special

The Blind-Fight feat is of no use against a character who is the subject of a blink spell.