Inherited primary lens luxation occurs in several terrier breeds - the Fox Terrier (Smooth), the Fox Terrier (Wire), the SealyhamTerrier, the Jack Russell Terrier and the Tibetan Terrier. (thedogplace.org)
CERF certification does not mean that the dog won't develop a serious problem such as lens luxation which is what happened to my English import Mini-Bull terrier only two weeks after she was CERF certified! (thedogplace.org)
Primary lens luxation in the affected breeds is inherited. (thedogplace.org)