Magnificent Obsession (1954 movie)
Merrick secretly arranges for Helen to travel to Europe to consult the best eye surgeons in the world.  They tell Helen there is no hope for recovery.  Right after this, "Robby" shows up at her hotel to provide emotional support. He confesses to being Merrick.  Helen has already guessed this. Merrick asks Helen to marry him.  Helen realizes she will be a burden to him. She runs away. Many years pass.  Merrick is now a dedicated brain surgeon. He searches for Helen.  He learns she is possibly dying in a small hospital.  He goes to the hospital and discovers Helen needs complex brain surgery to save her life.  Merrick operates. Helen awakens in the morning and discovers she can see.