My brother has macular degeneration. There is a "wet" kind and a "dry" kind, one is much faster than the other. Do you now which he has?
My brother has had MD as long as we can remember, he was extremely premature and had oxygen poisoning. If your father has the time or inclination, I highly reccommend that he learn braille. Almost everywhere has braille now, and it can help tremendously at ATM's and other places.
I will pray for you and yours.
Lord have mercy!