More: Duke is our beloved baby! Duke was born with a vision birth defect called PPM - Persistent Pupillary Membrane. We were unaware until he went to the dr and then an ophthalmologist for animals that he will more than likely lose his eye sight. But the dr can’t say when and to what degree. But this has not slowed him down at all. We live on Smith Lake in Alabama - he loves to hunt, fish and be everyone’s best friend. He wins the heart of everyone he meets.