I'm pretty sure BigPig has two!
Theres no discharge/discomfort etc. I have been keeping a close eye. He didn't have them when we got him, but a few months later they just appeared 
Is there any future side effects to this? Vision etc.
Half of me wants to get him to a vet to check out but then I feel there really is no need because he is fine. He can certainly see he's been watching the tv for half a hour , should I be cleaning them?