Type 1 and eyesight

Whilst you have changing glucose levels ie coming down from what were high levels on diagnosis you may have blurred vision.
When your glucose levels are high, the glucose in the fluids in your eyes also rises, to equalise levels more water is drawn into the eye through osmosis. This extra fluid distorts the shape of the lens and you have blurry vision or sight changes. As glucose levels fall the fluid level in the lens changes again , sometimes the shape distorting the other way and you can become very much more far sighted.

When I was diagnosed they brought my levels down very quickly (within days) and I could see for miles out the window but not watch the television as this seemed far too close . I normally have very low prescription lens for driving, perhaps use them for a small TV at night. When my levels were lowered, I couldn't even put them on without feeling dizzy.
In a few weeks they went back to almost what they were before, actually slightly better and that vision has remained.
In retrospect I think that my glucose levels were lowered a bit too quickly. There is some evidence that this abrupt change isn't good for eyes. A gradual reduction as seems to be happening with you may be better.

Not sure how long it was after diagnosis that I got my eyes tested, as Phoenix explains elevated bg does effect the vision, until such times that you get your levels stabilised I would just buy a pair of cheap glasses from your local pharmacy to see you through.