Juvenile (developmental) cataracts have been reported.  These may appear between 2 and 4 years of age.  Cataracts that appear at a young age and that are bi-lateral are presumed to have an inherited basis.  No genes have been identified in Border Terriers to date.  Breeding dogs should have yearly eye exams until at least age 8.  Exams beyond that provide useful information.  Young dogs with cataracts should have eye exams every year for at least 3-4 years and the results entered in the OFA database.  Depending on the rate of progression exams may be spread out after that. Longitudinal data can provide useful information.