Hi,
I am currently 24 weeks pregnant with my first. I had low level eye changes prior to getting pregnant and they have monitored these every 8 weeks. They haven't got any worse but even if they did, the Doctors have given me great confidence that they could catch and treat them early.
I had a lot of concerns prior to getting pregnant as I feel that a lot of the messaging from doctors, nurses etc was very negative but no one could really explain the actual risks to me. Eventually, I was able to meet with one of the top UK specialists and he was very reassuring! Basically, there is a lot of misinformation out there based on old data and anecdotes. If your sugars are well controlled (and that doesn't have to mean perfect) your odds of anything happening are very low, and with all of the monitoring and testing they can do these days., they can pick up any changes in your condition much earlier than they ever could before.
Best of luck!