A few years back I had a poodle with juvenlie cataracts and he was operated on at the NC State University in Raleigh. He was operated on both eyes and artificial lenses were put in. The operation was quite successful and healed without any complications.
I also had a dachshund suffering from age related cataracts and I decided NOT to have the surgery done. She adjusted wonderfully to the situation and went about her business as always. Dog learn to cope with it better than humans and don't seem to be too handicapped by a clouded vision. I don't know if I would put a senior dog through surgery.
I don't want to criticize your decision - just wanted to share my experience.