I didn’ t want to open an old post so I m doing a new one. I found out today that I have conversion insufficiency in one eye. May this be the cause of my last 2% of MV crapness I can’t solve?
I think you must be referring to ‘Convergence Insufficiency’. This means the two eyes don’t converge to merge their two images into one perfectly so I don’t see how you can get that in one eye. Wouldn’t make sense. CI occurs in about 5% of the population worldwide but is more common in certain races I understand. You’ll find a few references to it on here if you use ‘Search’. Most people with CI are born with it so have it life long and don’t even know they have got it. Few have problems with it. I have both read and observed that the majority of migraineurs have corrective lens for one reason or another. I’ve also read papers stating the incidence of CI in them is as high as one in three. I’ve yet to find anybody knowledgeable enough to understand the connection to migraine/MAV. It has been proven to have strong links with ADHD although some if this I’d suspect is misdiagnosis. If you have it and were born with it the question to ask would be why would it suddenly cause MAV. Very much doubt anybody could truthfully answer that. Not enough is known about it. I’ll email you a paper bit later you might find interesting. Helen
My eyes have a 3 degree squint (it was much worse when I was a kid, I had treatment). Is that the same thing?
Yep they used to call it a ‘squint’. Much like MAV was once called ‘Floating Woman Syndrome’. Not everybody with CI exhibits an actual visible squint. I think there are other conditions which can cause squinting to occur too. Helen
Well in my case I had it for over 40 years and in that time i had had one migraine :). So in my case at least a non issue.
Suspect if it’s stable the brain is more than capable of compensation …
yes sorry, my english i good but not excellent! yes i meant Convergence Insufficiency.
I don’t know if I had it before, is the first time I hear about it. So I am not sure if it’s a consequence of my MAV or not
I’d suggest you read the ‘Binocular and Convergence Insufficiency’ section first.
https://www.sciencedirect.com/science/article/pii/S0306987718301324
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thanks 
my VM is visual induced I have no other trigger so this is really interesting.
Anyway tomorrow I am starting rehabilitation therapy for CI …
Nothing much wrong with your English. You should be proud of it. It’s hardly a phrase in common usage. IMHO and I’ve researched this a lot over the years, cos I have CI too, I doubt it could cause MAV but I think the CI can make people far more motion sensitive from the MAV. Whether the presence of CI can stop MAV recovery. I don’t see why it should. I wouldn’t let anybody convince me MAV caused the CI either. It can occur due to an accident. Either that or people are born with it. Helen
Good luck with the rehabilitation programme. I hope you are able to cope with it and gain some benefit from it. Helen
I think when you do a “smooth pursuit”(a type of VRT exercise) one eye can lag behind. There are specific VRT exercises and they can fix this. Also bear in mind if this is a migraine artifact then the VRT might not help much.
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With most true 100% CI cases ‘smooth pursuit’ isn’t possible. Not at all because the eyes don’t track that way. What they actually do is a million tiny little jumps trying to keep up. However with minor CI cases some retraining may be possible, sustaining it much less so. Not that it matters really. The brain adapts brilliantly and each person has an individual version that manages to achieve what’s necessary, Few people lose out much.
I would imagine the rehabilitation @blueberry0 is about to start on for CI would be Vision Retraining rather than VRT. Helen
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Hi had the visit with the visual therapist, will start the program tomorrow, i m really excited about it 
She seems to know what she is doing and said that she can help with the remaining symptoms!
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Six months down the line and having recently discussed same topic with ANO I just wondered what happened next with you on the CI front.
I still have problems with my left eye, neurologist confirmed that it could be the nort so that is why I was trying to get off it. The rest I feel better, seems like symptoms are really slowly fading off, less intense less. Now is more of a perception of a symptom than an actual symptom
Oh the neuro thought that did he. Interesting. From my own personal experience I think the medics sometimes notice a very minor CI of some type (apparently 5% of the population has some minor CI and in migraineurs it’s about 20-25% so fairly common) and it becomes the scapegoat for the condition whereas it may just be at the very least a pure coincidence and at most an aggravating factor. I think same applies sometimes with people who just happen to develop MAV-type symptoms from say whiplash or another injury and who also just happen to have had a migraine or two in their medical history. In fairness it must be hard to tell. Interesting he thought that it could be the Nori. Quite logical though. Again it could be aggravating a very minor CI. I was advised not to take any tricyclics on account of my CI because they can cause problems.
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