hpst You have to explain something to me as I do not understand - you have monovision as in you only use one eye and the other is covered? Or that your brain prefers one eye even though you look with both? Because if its the latter and the fact that LED might be, for some yet unknown reason, forcing your eyes to work together, it would explain the strain.
Treatments, desensitization, pills, exercises - solutions
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martin
Intentional monovision is quite common with laser eye surgery, cataract lenses etc so you can see near and far without needing glasses since if your eyes can't do both you need to choose one or the other. Healthy, young eyes can both see near or far but still favor one for each thing...its just in my case I have no choice.
In my case one eye can see clearly at distance from say 30cm forward (displays are twice that far away)....one eye can only see clearly up close in the 7-20cm range. I do have that small gap there now due to age related presbyopia (for 15 years or so the ranges met up evenly) where nothing is clear in the 20-30cm range. Now of course the close eye can "see" at a distance but its blurry.
So yes my brain surely still "sees" the blurry side too and combines that info with the clear eye for better peripheral vision etc (since peripheral is blurry anyway). I am sure my odd eyes aren't helping matters here, but have a hard time believing this is the root casue since the issues that brought me here and are messing up my life happen only with modern LEDs and very quickly. I do get annoyed and sometimes strained trying to read small things in certain ranges and light as anyone my age does due to presbyopia...but the computers and tablets etc are all outside that zone and I can look at other things at those same distances without issues.
hpst How about covering the other eye then? Look here - https://migraineagain.com/led-lights-good-planet-bad-headaches/ I havent noticed it when I first read the article year ago, as my head was full of other theories. However this supports my theory -
"According to Prof. Wilkins, this mechanism could trigger the onset of headaches as the flickering may disrupt the movement control of the eyes and force the brain to work harder. Likewise, the flickering of the lights raises the odds of suffering visual conditions such as double or multiple visions."
As my issue is exactly of having to already work hard to keep singular image with my binocular vision, this makes sense.
4 months later
For those who tried cannabis medication: Do you think it is THC that helps you, or might it be CBD (cannabidiol)?
Oil drops with 5% CBD are legally available here (and absurdely expensive). I wonder if it's worth a try and if 5% are enough. And how many ml it would take to get relief.
5 days later
KM A new scientific study I just came across.
https://www.sciencedaily.com/releases/2018/12/181217151537.htm
I feel that this is only relevant if you already have preexisting eye and/or optic nerve damage. I don't know if I ever mentioned this before but when I was born I had a damaged optic nerve but only started having the problem (first from lights, not computer screens) in September 2011. Then it all went downhill from there 
lol.
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KM Any comment? Is it full oil that contains THC in the medical program?
https://labiotech.eu/sponsored/medical-cannabis-new-developments-dentons/
The cruel irony is that it's easier to get a THC oil with low/minimal CBD here...
Duuuh
JTL I don't know much. I bought 4% CBD oil ("Optima CBD") in my local pharmacy a few days ago. It requires no prescription, so it's not what you'd call "medical", I suppose. But probably better that many oils you can buy online. It seems to be very clean stuff, they state 99.87% pure CBD and no other cannabinoids like THC at all (0.00% each).
1 drop contains 2 mg CBD. I tried up to 3 drops, and while they seem to slightly dampen the eye strain and headache a little, it won't go away and comes back after some hours/the next day. I'm hesitant to take any higher dose. I'm not sure if this is healthy over time. They claim there are no known side-effects at all. I think it is recommended not to take more than 10 mg a day (I did read that somewhere).
I don't know the dose they gave the mice in their experiment. Treating anxiety and pain should take just some few mg (drops) while the treatment of other conditions requires hundreds of mg.
This CBD oil... Unbelievable how effective it is. Not helping with eye strain, but it is relaxing. I take just 1 drop and after some minutes am relaxed and smiling, and people notice.
KM Here's a link the original paper, it's open access so it's not piracy et al.
https://iovs.arvojournals.org/article.aspx?articleid=2718702
20 days later
I am waiting for my Kindle to read it, but here is a book of eye exercises one can buy online in pdf and ePub format
https://www.tryunity.net/store/p14/Refreshing_Vision_Ebook.html
I am not sure, maybe it was already brought up in the past...
4 months later
martin hi, alternative medicine is more accepted nowadays due to its promising results unlike pharmaceutical medicine, alternative medicine doesn’t give a negative effect such as kidney and liver problems when it comes to long term use. As for my alternative medicine usage, I use medical marijuana. The different strain has a variety of uses and effects depending on your needs. Like this marijuana strain https://www.gyo.green/the-cali-connection-tahoe-og-kush-con-tog-f.html. This strain has a very potent effect on chronic pains like back pain and joint pain and a lot more. The benefits of marijuana, specifically the CBD cannabinoid, are undeniable. Let's take a look at all of the ways CBD is helping patients every day. just sharing have a nice day
arethamorce Thanks. The problem is that such drug is available in a very limited number of countries. Well, at least to legally cure eyestrain or back-pain!
2 months later
Researchers found the helpful side of Cannabis. Cannabis is known as for addiction only but now it can be our Alternative Medicine. Cannabis now has many benefits that will be good for your health. Cannabis oil is produced by extracting the resin of the female cannabis plant using a solvent. After the resin is dissolved in the solvent, It is evaporated leaving a concentrated extract behind. CBD Oil is a type of oil that contains CBD but does not contain THC which can give you a high efficiency. CBD Oil is from that cannabis flower, However, Cannabis now is proven that can help people to relieve pains or lessen seizure attacks. I have read many articles suggesting that cannabis has a very potent effect when it comes with pain and inflammation like this strain on blimburnseeds.com/news/marijuana/news/media-tv/top-10-celebrity-potheads/attachment/2583-2/
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At least in my case, I believe the effect triggered by certain screens and lighting might be a type of migraine. Or at least that's the class it belongs in rather than anxiety, epilepsy, eye strain, etc.
It has a different set of symptoms to a standard migraine and is longer lasting. It is also unusual how quickly it triggers with some devices (even very brief use of smartphones can cause mild effects which get worse cumulatively with more use).
I'm looking into approaches to try prevent it with doctors, and will report back.
I think tech companies have some answering to do too if they have created devices that can trigger such things (even if some of us are more susceptible than others). No natural light source or computer system without "bad technology" seems to trigger these things and it has had a pretty devastating effect on my work and life.
I'd be happy to join a class action just to push them to create safer technology, if anyone can demonstrate a clear link and have the illness that is induced recognised.