The highest risk of progression of the retinopathy would be in the first 6 months following surgery. The most important things are what you already should know: keep you A1c as low as possible, keep your weight down, exercise, don't smoke, keep your blood pressure and cholesterol under excellent control, eat well, drink in moderation, cosider taking a baby aspirin/day and see you ophthalmologist at least each 6 months for the next two years.
JCH III MD