The user can recover from any/all kinds of disabilities and/or disabling injuries, physical and mental, making it so they can revert back to normal and are able to function as they usually would.
Dr. Eggman (Archie's Sonic the Hedgehog) was driven insane by his constant defeats at Sonic's hands...
...but was able to recover from it simply by reasoning himself back from the brink.
After going insane from his time displacement, Professor Paradox (Ben 10) was able to recover from it simply because he got bored with insanity.
Spike (Buffy the Vampire Slayer) is deafened to make him immune to sirens...
...but regenerates his eardrums, restoring his hearing, in mid-fight.
After his nerve system was damaged by Angela poisoning him, Arthur Petrelli (Heroes) was able to recover from the paralysis after absorbing Adam Monroe's healing factor.
Peter Parker/Spider-Man's (Marvel Comics) incredible recovery and healing factor enables him to recover from disabilities like blindness, restoring his sight after he was blinded by a ray meant to paralyze them...
...and after his eyes were burned out by the Vulture's acidic spit...
...while first gaining his powers allowed him to recover from near-sightedness, eliminating his need for glasses.
Orochimaru's (Naruto) arms were crippled by Hiruzen Sarutobi, the Third Hokage...
...but he was able to use the Shinigami Mask to recover their function.