I seem to be having the same problem. It seems the peripheral vision on the right side isn't as clear as it should be. Sometimes it seems like Im still having a visual migraine off to the right side but other times it seems fine. I also noticed a blind spot towards the top of my vision on the right. Im not sure what's causing this either. I just had an eye exam not too long ago and my eyes were fine so I dont think it had to do with that. This makes me very nerous though, and Im not sure what to do.

Are you overweight? If so look into Psuedotumor Cerebri. Its cause by a buildup of spinal fluid in your brain restricting the arteries in your eyes. This condition can result in permanent vision loss. It cause pressure in your head resulting in a migraine/headache and can impact your vision. MRI and MR Venogram along with a lummbar puncture are required to diagnose it. (I was recently diagnosed with this condition.)

I'm now 34 years old - and have the same problem after intense migraines. My migraines started at the age of eleven. It started affecting my eyes at about the age of fourteen. Strange! also my right eye (I'm left handed) - the migraines starts off from my left side, and not like yours from the right side. I have astigmatism and I'm wearing glasses (contacts) since the age of 21. The black spot (with stuff that looks like a crooked spider web appears like it is stuck there forever. The optometrist said that a cell came loose in my eye, I never told her about the migraines. I believed her, but now I'm thinking differently. Just like you the writer "Mpk", it's exactly the same with me. It's difficult to read sometimes, as these silly spot blacks out some of the letters. In the beginning it was frustrating, but you'll get used to it. You will also notice that you will see it more in bright light, and it will never go away, not even by wearing glasses/contacts (Hope you'll understand my 'English' writing).