Not realy advice, just relaying a simillar experience. About 2 months ago I finally tested my BG and it was through the roof. Through diet and exercise (and prayer) my BG has gone to normal levels. On about the third day of this quest though, I woke up, opened my laptop and could not read the text. I thought I was going blind as it happened overnight. My sight has not recovered as quickly as was mentioned above, but it has slowly improved to just about pre-scare levels. (For those reading along, yes I plan to go to an Optometrist eventually - just thought my experience might help).
You doctor is correct, your body is adjusting to new levels. However, if it doesn't clear up within a week or two you need to see an Opthamologist or an Optometrist to get a comprehensive dilated eye exam. Type 2 diabetics are prone to diabetic retinopathy, a macular degeneration [for lack of better words] of the retina. A simple non-intrusive retina scan is available too. To be on the safe side, I get one annually.