My dog was diagnosed about a year ago with diabetes. So in trying to help him with his eye sight and internal organs, I tried to find him supplements and foods that might provide aide against this disease taking over.
When he was diagnosed, it was sudden. The weight loss, the cataracts, the thirst for water and urinating immediately after. I found out a lot more info online and went from there. The first place I checked was Walmart's Pet section. Oimmal Eye Care Vision Health Support, I believe, has helped in prolonging his eyesight from making him totally blind. He likes the beef flavor and I was grateful they had this in a smaller quantity, lower price, where I could still keep up with his supplements.
I can't say this will work for all but it seems to be supporting what sight he does have.