Appy's do have a tendancey to get what is called "moon blindness". My mom's twenty seven year old Appy's eyes began to degenerate and that is one of the reasons why we put him down. It might have something to do with the scerlera that they have around the eyes. Idk But yes, it is typical somewhat of the breed to have the eye disease like that.
Shaneequah, 1998 gaited Bashkir CurlyxArab mare
Johnny Cash, 2001 Arab x pony gelding
Brighty, 2013 Standard Donkey jack