[bufordtwain]

As of about 5 years ago this started happening to me for some reason. I can confirm what another poster said - it comes as quite a shock the first time ! It happens to me about once a year now and it's painless but weird. I've never suffered from conventional (painful) migraines.

[andy800]

When this happened for me the first time, about 6 months ago, I initially thought it was the start of "geographic atrophy", a syndrome that Henry Winkler (The Fonz) does a commercial for, which is very scary, and irreversible. A bunch of web searching eventually led me to scintillating scotomas and realized that's exactly what I had, so I felt quite a bit better. I've had perhaps a half-dozen total. I'm also fortunate that it has not been accompanied by migraines.