Our Boston terrier has lost some of his vision. He loves to retrieve balls but we now notice he does not seem to see the ball he is chasing even close up. He still sees to negotiates around the house but his vision is clearly declined for know reason. We have taken him to veterinarian and had eyes checked. Vision check seems to be all okay. Puzzled by what is going on.
Take him to a veterinary opthalmologist. There could be many things that could be wrong and an opthalomologist would know what to look for that a reg vet might miss. You may need a referral from your vet to go see one.