I would describe it mostly as out of focus, although sometimes it is
smeary-blurry, if that makes sense.  Like someone took a newly-painted
oil painting and wiped a hand across it.  It's the entire visual field,
and it's only ever in the left eye.

The blur lasts anywhere from a couple of minutes to an hour.  I don't
get sore eyes or a headache, although often when something flashes or
flickers I feel quite motion sick.  I've also noticed that my jaw and
neck get tight, which I attribute to trying to use the muscles of my
face to pull my vision into focus.  Unless maybe it could be the other
way around?

I'm 37 and pretty healthy.  I had strabismus surgery when I was three,
but never had any problems other than that I'm pretty bad at catching a
ball.  Reading, though, was always perfectly easy and enjoyable.

Thanks for taking the time to reply to me!
--Jane