Yes it is the blood sugar affecting your eyes. Mine were really blurry i had to wear my glasses to do most things and as the blood sugar dropped my eyes started to improve/
It took around six weeks to get back to normal, but i tell you that when they do get back to normal you will be amazed at all the wonderful colours and brightness of everything .
I am having my yearly eye test in May and I know i will need new glasses with a new better prescription because I find myself reading small print now that i couldn't read last year .