Gurm Really try to find an optometrist who can measure it. Ive read some studies and its way more complicated and individual than a youtube video could convey. You can also have vertical hidden heterophoria instead of horizontal, theres just too many variables you cannot check without proper examination.
Treatments, desensitization, pills, exercises - solutions
martin I want to add, a while ago we discussed here the SCM muscle and stretching it and how in me it produces similar pain in the head. I noticed when I stretch it but dont move my eye muscles to their extreme side positition while doing it, the headache doesnt start. Seems like another pointer to the eye muscles only and it seems that the pieces are finally falling together.
Im writing this with my glasses on iphone 6s plus that was previously unusable. Images and video are fine, reading and writing more difficult, I feel muscle strain there but far from what used to be. The birghtness is about 5% so if pwm was present, it would show. Its been about two hrs looking into the phone now. When I lay it down, the discomfort will soon dissipate.
So there is a clear connection, in me. Id like for everyone to get tested by an optometrist, then we can have our own “research”
Martin, sorry if you've already said but are there special/different lenses for this? Or is it just exercises? I want to know the scope of what I'm asking the optometrist for.
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martin What do you attribute your successful use of the iPhone 6s to. The prismatic lenses or the exercises or both? Have you tried other devices? What devices did you use comfortable before the prismatic lenses/exercises?
When did you first suspect you had a convergence issue and who diagnoses you (an optometrist or opthamologist)? You originally said you had a divergence insufficiency?
Also came across these new type of lenses: http://visionsource-olmospark.com/neurolenses/
ryans Also came across these new type of lenses
I think that's similar to or the lens that @martin has.
I did some research and there are no doctors in Canada that know of the neurolenses it seems, but there are some doctors in Washington state who know about them. I don't know if they'd help me because I also have nystagmus, but what's the worst that can happen? It just doesn't work.
14 days later
martin Very interesting to hear your experiences, I can relate to almost all of it. It's almost like a mental handicap that people can't see and struggle to empathise with. Sounds like we're in the same boat with convergence/divergence issues, and I totally agree that modern screens are pushing people like us over an eye strain threshold and into migraine town. How are you managing at the moment having used prisms long term and done divergence exercises?
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Seanicus I will make a separate thread about it, where Ill explain everything so people can get back to it. The glasses help, the first day was very painful but then the muscles relaxed and now they help in about 50%, so its uncomfortable over longer time, but no migraine. Without them, back to day long migraine (tested in apple store).
I havent started the exercises yet, but Ive already been shown what theyre about and I must say, one thats supposed to make me able to use the eye muscles that are completely neglected is extremely difficult and gives me the same pain as the screens. Theyre composed of beads on a string, using various lenses in quick switching and focusing to make my accomodation more flexible, and using 3d glasses and connecting ever more difficult 3d images. Its gonna take about 4-6 months for me to be where my eyes should be.
I asked why I couldnt train that with the diplays themselves. Theyre too challenging and smaller steps and increments need to be taken, also a guidance on how exactly to operate your vision (contrary to what were all trying to do - focus as hard as we can on the screens that gives us issues, its actually about relaxing. But you have to know which muscles and have to learn to feel them).
The theory now is that problematic displays give less or almost none visual cues. So contrary to what people think - that they are better because of higher res and smoothness, it might be the exact opposite. Whether its the glare, polarization technique, dithering that messes with ability to fixate on one point, PWM or all together, eventually you have nothing to hold on to to fix your already tired vision.
I intuitively knew this would be the case or major part of it, and I was trying to consciously relax my eye muscles when looking at the displays. But its just too much to handle at the start apparently and its like trying to lift extremely heavy weight - you always burn out before you can use the muscles that you actually need to.
Ill have a list of trustworthy optometrists in USA, Canada and Europe from the guy. Let me know where you are and I can try to add to it, you can contact them and eventually find someone who can help you if this is your problem.
Hey, good idea with the seperate thread and a summary of all we know about the convergence weakness.
In addition to that: it's easier for the eyes to look at a bad picture with pixelated edges instead of a picture with rendered edges. It's about the visual centre putting the two pictures from your eyes together. So maybe this is the difference why firefox 56 is ok for some of us and higher versions with the better rendering not.
martin Ill have a list of trustworthy optometrists in USA, Canada and Europe from the guy. Let me know where you are and I can try to add to it,
Vancouver, BC, Canada
I looked at the NeuroLens site and there are a few in Washington State, US but it's a bit more difficult going to another country for medical stuff, if you know what I mean. 
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Anyone near New York City?
Those beads on a string are called Brock String?
I noticed something very very odd today. In a room with what I suspect are harsh LED lights (give me eye strain almost immediately), I can detect flickering (PWM?) on someone wearing a checkered shirt. Looking at this shirt I can see a very fast flickering. Looking at solid colored shirts (or other things in the room) do not show any visible flickering. This type of shirt in the sunlight does not seem to flicker.
Example shirt: http://www.tommyhilfigertshirts.com/images/product/Tommy-Hilfiger-Gingham-Cotton-Shirt-Ebony-Black-Checked-Shirts-Dm0dm01837-3.jpg
- Was PWM a problem for you and is it now tolerable?
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ryans It's not light related, it's an optical illusion. I get the same effect from the shirt. Illusions are some pretty freaky stuff. F'instance, this one, it will look like it's moving and I guess flickering, but it's actually not, copy and paste the following if you want to see an example of a surprisingly strong one. I didn't link it directly because not everyone will want to look at an illusion. imgur.com/rPTPZ
martin This all sounds about right for my situation. I even went through the 'I'm going to have to get a manual labour job' phase aha! I'm learning how to relax the right muscles right now. It took a lot of practising and visits to a good physiotherapist. Even now it's hard, I think I'm just a chronic muscle tenser and it just happens like a bad habit. But it seems like we have some kind of a path to get over it. I imagine that this is problem that's particularly difficult to deal with in the last few decades, as screens will be much better in 10 years time (not to mention modern lifestyle stress). I appreciate the offer for Optometrist contacts but unfortunately I'm in Australia!
A question though: do you experience flickering in your vision in dark environments? I get this a lot these days, which I believe is a symptom of ocular migraines. Usually occurs after having eye strain and viewing bright light sources.
ryans I've had similar experiences with patterns and harsh lighting. I remember freaking out a bit the first time but nowadays it's pretty standard. I also get ongoing flickering in my vision in dark environments, which is probably due to ocular migraines.
While I agree that there is definitely a chance that lack of true binocular vision/convergence insufficiency could be the culprit, we know from evidence that displays ARE employing flicker, and desktops also using dithering. Would you knowingly (even without discomfort) sit in front of a strobe light for hours on end?
I'm just suggesting that while relaxing the eyes could help to 'tolerate' the screens for longer, there may be neurological/physiological effects of using these displays that go undetected.
I am also in a small minority with Strabismus, and due to how I was born, will never attain binocular vision. So this method of vision therapy will not help myself.
I am aware that people with small deviations can practically cure themselves with vision therapy, so wishing you good luck. A book I highly recommend is Fixing My Gaze by Susan R. Barry.
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diop we know from evidence that displays ARE employing flicker
It might be even worse than we thought. It seems even "flicker-free" displays flicker. There is high frequency but no stable light. The ones I tested so far flicker at <1% to 6%. One might think those are values low enough not to matter in any way. But what if they do? An single, instant change of 5% brightness is visible by the naked eye. So the information clearly passed through all nerves into the conscious part of the brain. And now imagine flicker of 5% at 200 kHz.