Hi
I was diagnosed Type 2 a month ago, and had this exact problem, it was quite scary as I also had double vision, and it actually affected my balance too.
In the last couple of days my eyes seam to have gotten back to normal, and its coinsided with seeing a rapid drop in my BG readings, I'm regularly seeing ranged between 4-7mmol/L now and feel much better, well apart from getting a bit of a cold from the kids !
I got some reading glasses (+1.00 were fine for me) but found my eye sight was up and down all the time.
Stick with it, keep on with the LCHF diet, and your eyes will one day soon get back to normal, mine took 2 weeks to sort themselves out ..