The hope is technology changes and he can have normal eyesight in the future which I am sure will happen.

When my brother became acutely ill he was rushed to the local hospital, St. Lukes in Newburgh, NY. There the doctors said nothing could be done, and they were going to let him die. He was rushed by ambulance to St. Francis Heart Hospital, in Roslyn, NY. There he received Last Rites. The doctors proceeded to treat him with a new protocol, developed for pediatric patients. My brother lived into his 80s. New technology, indeed. There is a great future ahead for your grandson :)