Well in my own experience the retinopathy came before the neuropathy.
Not trying to scare you, but REALISTICALLY speaking I would guess it's a leaked blood vessel at the back of your eye but I honestly would not freak out. The danger is when it goes left untreated.
The good thing is you will find out tomorrow whether it should clear up on it's own, or you might need a little bit of laser.
If your vision isn't actually affected then this is honestly a good sign. Right now I can hardly see anything out of my left eye because I have another huge bleed. So far I've had laser surgery 7 times, all before the age of 24 and I've only been diabetic 5 years. I drew the short straw.. I've been unlucky. This is really rare/
Good luck tomorrow.