Yes, this is definitely sign of migraine. Visual distortion is quite often associated with migraine. I get little areas of blurriness - like circles swirling on my eyeballs, sometimes I can only see from the middle of my eye to my nose and not be able to see anything sideways. It can be scary if you've not experienced it before, but it is not a stroke or anything horrible like that. Take some painkillers, get to a darkened room and rest your eyes.
I have also had, with a very bad migraine, difficulty reading and comprehending, I could read the words, but not understnad, that was very scary!