Depending on how far you're willing to travel for the second opinion, there's a veterinary opthamologist you could try in Newmarket, Ontario. I took one of my dogs there a few years back for an exam. The name of the clinic is York something. I think it may be just York Animal Clinic. It's on St. John's Sideroad.
Beware of Mushers...They will suck you into their addiction!
If your dog thinks you're the best, don't seek a second opinion!