I’ve worn glass since kindergarden and until a recent surgery had 20/200 vision sp the blurred part was never aplicable to me. Still is it odd that I go through 6-10 litres of water a day?
I would have to say that it is an excessive amount. If you current blood work is ok, then you need not worry for a while at least.
I wear glasses too, since I was young, the blurred vision is actually from the eyeballs swelling up due to the excessive sugar in the body. When I started on the insulin the blurred vision continued for a long time due to the shirinkage of the eyeballs back to normal size.