I had not noticed Smudge's light brown eyes before.....if my Sheltie Talk book wasn't packed away, I would take a look.
Both my pups eyes are almost black, with no white and no discernable pupil either.
I checked Bacca's eyes, and he has a similar black rim around his eye. I think it's the contrast of skin colour against his sable fur.
That being said, if you are noticing a difference between one eye or the other, then it may be something to look at further. That is, if one eye seems to be tearing more, drooping, etc.
Otherwise, I'd said he's got neat eyes for a sable. I really wish I could get my hands on that book! I don't know what the conformation rules around his eyes would be. He's not a sable merle is he?