The One Thing by Marci Lyn Curtis

Maggie Sanders' life got flipped upside down when she went blind six months ago, losing everything she dreamed of, but the last thing she wants is pity for it. When her rebellious streak gets her a probation officer, she ends up meeting Ben—who, for some reason unknown to her, she can see. In Ben, she finds that not everything was taken away from her, but when she figures out why she can see him, her world is threatening to shatter.