My eyes were 'playing up' for a couple of weeks before diagnosis, phone and work emails were blurry but I blamed my varifocals and excessive de-misting putting them out of alignment.
As soon as I started medication and my BG decreased everything went, it was like I wasn't wearing my glasses. but with a magnifying glass everything was perfect.
I am now 5 weeks in, and my distance and TV viewing vision are back to normal, but only started coming back about 10 days ago, I can squint and read my laptop and phone now for short periods, but am happy that I know it's not permanent even though the Specsavers optician said she couldn't see damage. I haven't driven for a month, and am only now confident that if I go out for a quick spin this weekend it will be OK.
I googled too much and hearing it'll be better 'in a couple of weeks' so I was panicking, but as my HbA1c was initially 129.5, I had a bit of adjustment to do!