The three have Leber's Congenital Amaurosis (LCA), a rare inherited disease caused by defects in a gene encoding a protein needed for vision.

Even though she can't see well enough to read or drive a car, she can now make-out her children's faces, watch them play baseball and see the light change over Lake Erie, where she lives.

She said: "Life is so much easier at a level that most people take for granted. Any amount of vision that you can get when you have almost nothing is incredibly valuable."