I'm on the "yes" side of this. not all blindness is physical... I recall reading about "the rape of Nanking" WWII and how a woman went blind from what she saw. The mind can be the cause of much troubles. Releasing the obstruction in the persons mind/heart, can clear ways for the body to work again.
I'm not questioning repair of physical deformaties, but just on the emotional realm, I say yes it's possible.