EOAD (Early Onset Adult Deafness). A test is now a available from https://mydogdna.com/home

As of 3-8-2020: I’ve tested the following Stud dogs:

Imported Coal      EOAD  CLEAR

Imported Glen      EOAD  CLEAR

Imported Jimmy   EOADCLEAR

An analysis of the inheritance pattern of an adult-onset hearing loss in Border Collie dogs. Canine Genet Epidemiol v.1; 2014 PMC4574391