Congenital Blindness
Blindness is defined as the inability to see with any clarity in the world of Ithan. Congenital blindness is blindness that one is born with. Congenital blindness only has been recorded to affect the descendants of the Hunay. Of all of the fourteen Races of Ithan, only four are descended from the Hunay and only those four are affected by congenital blindness. Congenital blindness is a rare condition. It affects Merfolk the most often. Merfolk are affected at a rate of 1:300, Beastfolk at a rate of 1:500, Humans at a rate of 1:1,000, and Cait Lee at a rate of 1:2,500.
Gifted by the Gods
I really like the cultural importance of blindness for followers of Koaelore. I also like that you've included the rates that each species tends to be affected. :D