Thanks Dangermouse,
I went to see the specialist last week and previously had another spec med to test for laser surgery which included that eye ultrasound. I found the whole thing pretty fascinating actually and learned a lot about eyes from quizzing everyone on everything they were doing. Thankfully no problems were found so my eyes are fine, just odd! I'm now starting on IOT8 next month. See you there? If you'll be on that course send me a PM!
Thanks to all those who offered their thoughts and encouragement.
Hurrah for being a medical anomaly.