Alexis has been blind all of her life. She's never seen the world and at some point it stopped bothering her. She learned to get along on her own in a small town and she's, for the most part, happy. All of that changes when your character comes along. He begins to describe things to her, tell her about things that she's never seen and in the process he plants a seed of desire in her to be able to see. There's an experimental procedure out on the market said to restore sight and with his/her help she scrapes up the money and gets the operation. It's a success and she can finally see, but things aren't quite the same. She's changed, she's acting odd and no one can quite understand what's going wrong.
((I was thinking a bit of a supernatural or psychological twist to the story. Perhaps during the operation something is changed within her brain and she begins to lose her mind. It will be a dark, psychological type thriller.))