Well, generally speaking, it can not cure blindness. First, you should know what the cornea transplant is. In common, the cornea is the tissue on the very front of the eye. And cornea is clear and covers the iris and pupil. When the cornea becomes swollen, or scarred, you may need the corneal transparent to treat it. With the surgery, it will just solve the problems, but on the other hand, it will also increase some risks. For example, it may lead to eye infection, because you do not protect your eyes from virus carefully. And when the recovery is infected by some other eye diseases, it can just affect your corneal, leading to eye infection. but in common, it can be safe.