Gosh Amy, I wish I had some ideas for you...
His blue eyes certainly would make it easier to notice things like this, but as cyber-sibes pointed out Huskies are somewhat predisposed to eye problems.
You are both in my thoughts. Try not to worry too much since it's not hampering his quality of life in any noticeable way!! (I know, I know, easier said than done.)
*HUGS*