Snowy is developing cataracts

When I took Snowy to the Vet last week for her yearly immunisations, I was told that she is developing cataracts and is slowly going blind. This is apparently because of the diabetes. You can imagine how sad I am feeling right now! I can't stop thinking about her and how she is going to cope. Will she get distressed? What sort of quality of life will she have? She goes back next week for a day in the hospital so they can do a glucose curve. This is to monitor the dose we are giving and check if we need to reduce or increase the dose. This poor dog is going through alot at the moment. Poor Snowy!