Oh my goodness, I finally know what this is!! I have had this twice in the last 5 years - both times when I have stretched out on my side on the sofa to lean against my other half (bless him, he thought he caused it!) I had no pain, just an odd blurry sensation which made its way across my eyes over the course of about an hour before vanishing.

I had put it down to eyestrain (working at a PC all day) and to keeping my contact lenses in too long. The second time I went to the GP and he thought it might be the start of a migraine but had no specific name for the phenomenon. As there has been no pain, we didn't panic or worry about medication, but it is very interesting to see that it isn't just me!

How very odd to come here for support in one area and get an answer to something totally unexpectedly!

:)