| Lemmy |
I suppose it could be a feat (with Blind-Fight as a prerequisite, maybe).
Blinsense and Blindsight are a bit too powerful for low levels, but not gamebreaking. Especially if you are blind. you effectively can only "see" things in a 30~60ft radius, only in black & white and you can't read. This ability will be rather useful in close quarters combat, but it'll seriously hamper you in all other situations.
Using RAW, the only ways I can think of the top of my head are the ones already mentioned here