My Cocker Spaniel has, er actually, make that HAD, the clouding of the eyes. It was not cataracts, as per our vet. He said it was virtually a harmless condition. But it would be like looking into a smokey room. He had no suggestions.
My friend, well versed in herbology, recommended parsley daily with meals. It can be fresh or dried, about a teaspoon or so, sprinkled on dinner. I saw no harm in feeding my dog parsley. I'd read somewhere it improved the dogs breath.
Well lo and behold not only was his breath fresher, but the
clouding is completely gone! 
It's been nearly a year since I started feeding parsley. My Cocker is 12 and it's wonderful to see his bight little eyes shining once more. I can't wait until his next visit so I can tell my vet! I now
add parsley 
to all of my dogs foods.