Hi Jannor!
I've worn glasses since childhood - and suspect that I'm loads older than you are! But did find that problems I was having with my vision - tired eyes, getting very dry etc. improved tremendously after I was diagnosed, went low carbing and controlled my blood glucose levels. So I think it is worth waiting to see what happens - but you'll probably need a meter to test your eating and find out what suits you and hopefully not develop T2.
I now wear contact lenses - I've been using varifocal lenses and you can get what they call multifocal lenses. Good thing is you can leave them in for a month - sleep in them etc. downside is it can be tricky for them to get the prescription just right and they are not cheap. I pay £35 per month but that does include a regular 3 monthly eye check, expect it could be cheaper elsewhere but you do need a really good practitioner and they vary a lot.
Hope this helps.
Ann