My 11+ year old Shih Tzu is starting to get cataracts, her eyes have a light blue tint, but she can still see good. I was using Sensodyne (for humans), then started using C-bright last year, which is especially for dogs and cats. It works WONDERFUL! I could tell her eyes are clearer and a lot less red. I first purchased it from another on-line company which quit selling it (their loss). I did a search for C-Bright and found this wonderful company. Very good prices and ships very fast. I ordered and received it 2 days later. You cannot go wrong with this product, or this company.