hugs to you. i'm t1 (12 years) and got the same letter as you in 2010. was hugely panicked, i thought my control over the years had been pretty good with a few lapses. i'm new on this forum, i expect there'll be others around with some great info, experience & support...all i found out was that they just keep an eye on things(no pun intended!) and can treat with laser if it progresses. my eyesight feels same as ever and hasn't deteriorated as far as i can tell.
sure i read on here somewhere that someone's consultant had said it's rare to lose sight with this these days, only read that recently and felt slightly comforted!
i do know with careful control we can halt it and stop further complications.
weezer x