The cat I have had has been blind for 3 years after a cat fight infection. Since we were taking chlorine dioxide water purification drops, we decided to use the Part 1 drops, 1 or 2 drops per hour during the day, on our cat. Two months later, her sight has returned and she’s full of vim and vigor like when she was 4 years old, and she’s 18. She has a new life thanks to chlorine dioxide.