To think this isn't normal ?

[pinipol]

I was sat and all of a sudden my eyesight in my left eye went funny.'it started like I couldn't see probably ..like a bit of my vision was gone (like I couldn't focus ) a few minutes late I started seeing flashing zig Zags and then my whole left eye was full of blurriness and flashing lights.
It lasted 30 mins then went away.
That's not normal is it?
What is it?

By mention of anadin extra, I mean for painful headache type migraines. I also get ocular migraines which are painless but take some time to pass. Agree worsens with period.