In severe cases, your dog may be blind. [substeps] Place objects in your dog's path and see if he avoids them or bumps into the obstruction.
[header] How to diagnose collie eye in shelties [title] Test your dog's eyesight. [step] If you want to know if your sheltie has cea, then test his eyesight. In mild cases, your dog may be able to see well enough to cope.