Cataract surgery for diabetic dog?

Thank you everyone, for the thoughtful replies and experiences shared. Overall, I'm not getting the feeling that surgery on a diabetic dog is a gratifying thing for them or the owners. My own (diabetic) mother had cataract surgery which gave her clear sight for a few years, but then the diabetes went to work on the optic nerves, and she STILL went blind. So that's one thing I was concerned with - if Jimmy is doomed to be blind anyway, I won't put him through the surgery. Since he still makes out "contrasts", I have outlined the black steps on our van with white tape; and the edge of the step off our deck, with a bright aluminum trim strip. A funny side effect of this is that he jumps the cracks in the concrete....LOL! He seems to be accepting his poor eyesight, and yes, using his nose/ears a lot more. Also is adapting to NOT bonking his nose on things by carrying his head down so if he bumps something, it's with his forehead - smart boy :-) Overall, he's his usual happy self.