I've had my eyes checked by 4 eye doctors. I think a retinoscopy has also been done. No abnormalities. I do have a rupture in the cornea in the right eye, which was caused by a laptop bag carry belt that whipped to the eye as it got disconnected from the connector. In fact, it is the right eye that is always more bloodshot when I have this eye strain from PWM or temporal dithering.

Otherwise I've always been very healthy, I've had no other "weird" symptoms from anything else. But I think this seems to be the case for many others. The only issue they have with their health, is strained eyes from PWM or dithering. It is frustrating that neurologists etc. are trying to suggest that this is psychosomatic, as it just clearly is not. And I really can tell this, as I've had this for 25 years.

One thing though - dieting, e.g. consuming less calories than needed, makes this problem worse. Especially ketogenic dieting. But still - it makes it worse only if there is a display that irritates the eyes. I've done some intermittent fasting and on days where I've had 16-24 h fast, if there is a display that irritates, my eyes get more bloodshot and recover more slowly. (Other people report also having red eyes while doing ketogenic diet, so I think this is kinda normal, if you do something a bit extreme, some stuff like this can happen in the body)

Has anyone been able to find any doctor who would acknowledge this problem and admit that it is a problem and is not psychosomatic? I'm in the process of trying to find an eye doctor who would actually see this happening to my eyes - I'd go with normal clear eyes to the appointment, then use e.g. a Samsung AMOLED phone for 30 minutes, then the doctor could see with his own eyes that my eyes are clearly bloodshot and he'd have to acknowledge that this is a thing that really happens.

Of course, people who do not have this problem are usually unable to relate to this, so the doctor could probably still claim that is is psychosomatic that I somehow just produce the bloodshot eyes in this situation. But I assure you that this will happen every time, even if there is no way of knowing if the display has PWM, so a double blind test could be performed as well. It is quite easy to do, as some displays have PWM at 99% brightness and no PWM at 100%. So the doctor could adjust the brightness value by 1% which is not something that you would be able to notice by eye, but you would be able to see the eyes go bloodshot if the brightness is 99%

It's interesting some of you say one of your eyes hurts and gets red first. It's the same for me. My left eye is the first eye that starts to hurt and get red (bloodshot). Often it's the only eye which is red. Sometimes the redness is evenly distributed, sometimes only very selectivity. Which depends on the display/software or light source I've been looking at.

The eye doctor said there's nothing wrong with my eyes and that I don't need glasses. I also did a test where I looked at some screen center where dots move in from all sides. As soon as I saw a dot anywhere I had to push a button. I guess that was the Humphrey field test? The examiner said that test didn't show any problems.

    Kray I'd be interested in knowing if IOP (Intraocular pressure) correlates with eyestrain.

    They have portable devices for measuring IOP. Would be interesting to look into (ha) and record some results when having strain, not having strain, etc.

    http://www.icaretonometer.com/products/icare-home-tonometer/

    One thing that's interesting is that cannabis is proven to lower intraocular pressure without a doubt. And with it I notice the eyestrain is MUCH better.

    Been a little experiment of mine since the beginning of the year with a new doctor, and it's made real results.

    I've been meaning to write about this earlier, but like all new treatments didn't want to "jump the gun" and give false hope early. I can say that's not the case though.

    https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1772142/

      The whole thing it's interesting, but if you don't have the time skip to 4:00 and just watch that segment. My old pain doc sent me this back in 2012: "Look up on youtube "anthony sims dental" I am wiring with this group and we are finding that all sorts of things clear up when the jaw is repositioned to take the pressure off the discs."

      https://www.youtube.com/watch?v=Wdng6X5DPRQ

        degen

        Hey.

        all sorts of things clear up when the jaw is repositioned to take the pressure off the discs

        Thats absolutely the same my new expert doctor told me and I was trying to explain you. ;-)

          I guess we can all agree that the issue is a mix of health problems and technological changes (pwm, dither, anything else not yet discovered...).
          I have been talking to a physiotherapist friend, tried one thing and wonder whether you might have similar experience. My testing device which causes the strain now is iphone SE, which I am keeping as long as I can before it looses value to test all I can on it.
          What I have noticed is that for me the issue is definately connected with my eyes being unable to focus (lock focus) on the screen. I have tried to keep close attention to what all my eye muscles and face muscles are doing when looking into the display - general tension until strain and migraine.
          However when I refocus my eyes every couple seconds to the edge of the phone or anything in the same plane of focus, my eyes and all the muscles around them tend to relax immediately. Of course then, looking back at the screen, it starts again. However this helps me to avoid the strain before it builds up into a migraine. Annoying and still not a solution, but I wonder whether you could try and see if you have similar experience? Refocusing basically resets the eyestrain to zero.

          Unfortunately so far I dont think I can train my eyes and muscles to relax completely when looking at the screen. Nor am I sure if that would be healthy in case this is a justified defense mechanism to avoid these specific devices and whatever they do wrong.

            For some people, this inability to focus and resulting eye strain has been related to the "crystalline" anti glare coating on some displays.

              degen you got me shoving a block of balsa wood in my mouth. feels interesting.. i wonder if the positive (for me and others) effect of wearing earplugs could be related? e.g. pushing the joint forward a bit..

              i'm certainly in the long term teeth grinding camp

                MagnuM Uh. Should I be worried? My doctor prescribed me Ciprodex ear drops which are similar but I assume a smaller dose as well.

                    martin Ive seen a famous neurologist about this issue, but he has been of no help. Told me it is overuse syndrome, that man is not made to look into any display for 8 hours a day and that he can not help other than to suggest to take a month off all displays and see. Did not seem interested in my explanation about older devices not causing it and immediate relief there. Other suggestion was that it is psychosomatic.
                    It is difficult to find doctors interested in exploring new unexplained topics.

                    I 100% understand and agree, it is VERY difficult to find a neurologist who takes this disability seriously. It took my 6 tries before I found one and even he isn't great. Really what it comes down to is our issue is unknown, and practicing physicians aren't in the business of research and determining causes to unknown problem. They just put you through a treatment protocol, prescribe the treatment protocol directs, and moves you on your way. Our problem is largely unresearched, and just isn't well known. Most of the research concerning it is based out of the UK as well.

                    The one consensus I have been able to arrive at between my neurologists, ophthalmologists, and ophthalmologists is that it is a brain issue, not an eye issue

                    . Ive seen one post about macular pigment, has anyone here ever got it tested or tried to take supplements for it?

                    I tried various supplements and "blue light protection" pills, they don't do squat.

                    Has anyone else done this retinoscopy procedure?

                    I've had three full nuero-optholomogic workups, including that test and others. My rods, cones, optic nerve, pressures, everything is perfectly fine.

                    One thing though - dieting, e.g. consuming less calories than needed, makes this problem worse.

                    I have actually noticed that as well. When I am dieting, my sensitivities go WAY up

                    Has anyone been able to find any doctor who would acknowledge this problem and admit that it is a problem and is not psychosomatic?

                    My nuerologist knows it is a problem, and I've seen some biofeedback and nuerofeedback practitioners who are familiar with it. Anecdotally a lot of people seem to know people who suffer from it, but no one knows a treatment. I have run into a willful desire by the medical community to not want to acknowledge the issue or try novel treatments or research. It;s bewildering, but it is what it is.

                    I saw the top nuero as the second leading headache research center on the planet, and he acknowledged it is a known problem that simply isn't receiving a lot of attention. He's the one who told me that most of the research on the issue is coming out of the UK these days.

                    I'd be interested in knowing if IOP (Intraocular pressure) correlates with eyestrain.

                    I've had my IOP checked more times than I can count. Perfectly normal. Once again, all signs point to this NOT being an eye problem. It's a brain problem.

                    There is an increasing area of research growing concernign the effect of colors on eye health, brain health, and eyestrain/headaches. Irlen Syndrome has been picking up steam as an explanation for photophoia and an associated treatment, there is a new treatment called "Spectonics" that treats individuals inability to properly process light of a certain color, unfortunately licensed practitioners are few and far beween near me so I haven't been able to try it. Vision Therapy has been around for a while and can be used to treat perceptual abnormalities (a ot of folks with our problem report issues trying to "lock on" to images in certain screens, wth associated eye strain). I did a full 3 month course of Visual Therapy and it cured my sensitivity to 1 type of screen, credit card terminals. Unfortunately it did not help with PC or phone screens.

                    And when comparing phone screens now, it is incredibly clear that the screens that do hurt my eyes and the screens that don't hurt my eyes have different color balances. Glaringly obvious. Also dithering and PWM being on or off don't impact me at all. At this point, I am 99% certain my eye strain is caused by the color of the light/LED. Not saying it is that way for everyone, but it's the only symptom that fits in every single case I have experienced, and it where I am focusing all of my research and testing on from this point forward.

                        ensete I certaily notice a huge difference in effect between colors of standalone leds. blue being the worst. followed by white(!) then red. green maybe is the least offensive.

                        Have you tried the Alpha Stim thing- hooks up to your ear lobes and gives little shocks? I did that for a while & it was interesting.

                            JTL Nah, you'll probably be fine. These things are handed out like candy, and only a small percentage of people get any adverse effects.

                              ensete Thanks for that long post ensete. I always have time for what you have to say. Your issue is definitely a fascinating one given that you were able to pinpoint it down to something as specific as color schemes!

                              I totally agree that the issue is more likely with the brain than the eyes. That's where the odd sensation will start, and although it has aching eyeballs that comes along with it, it almost seems like it's coming from behind the eyeballs (like where the head of the optic nerve is). That's just me speculating though.

                              It's so odd how some monitors will give me an instant "eye-grain" I want to call it (within a couple minutes). There's various different computer monitors throughout the office, and when working deskside with certain people, I have quickly learned the ones that give me instant problems. Here's a short list:

                              • Dell P1913
                              • Dell U2413
                              • Dell U2713H

                              I first knew something was up way back in December 2011 when I built a brand new gaming PC with a Samsung SyncMaster S24A850DW, and I suddenly didn't want to use it because of the way it made me feel. It was similar to the symptoms the monitors in the list above would give me. Instead, I sold the like-new monitor at a -60% firesale to a friend/colleague at work who's still using it to this day.

                              The only lowest common denominator I was able to come up with was the LED backlight. All operating systems were Windows 7, with the Samsung being used on a Zotac GeForce GTX 580 AMP! and the work monitors being used on an Intel HD Graphics 4000 (likely integrated given the small form factor of the Optiplex 9010 housing it).

                              The setup I'm using both at home and work that avoid this type of headache (aside from pure reading overuse headache, which is a different set of symptoms), is a Dell U2410 on 0% brightness, "Warm" color scheme, and f.lux enabled @ 5000K. When working on color-sensitive work like web graphics, I will revert my monitor setting to default, and disable f.lux. This will cause my "eye-grain" symptoms I described above with a sharp "cold" pain behind the eyes, and a pain deep in the head. This is still tolerable for a few hours though, as it's not as bad as an LED monitor.

                              Interestingly enough, I was diagnosed as having "Irlen Syndrome" back in April 2014 by an Irlen consultant, but since I wasn't able to find any Irlen lenses that seemed to make a big difference, I basically just "considered" the theory and kept it in the back of my mind.

                              Perhaps avoidance isn't the best long-term strategy, but for a few years now, it has been working for me. I basically just refuse to look at any person's monitor at work that is an LED, preferring to remote into their PC using Skype for Business and talk on the phone. Hey, whatever works right!?

                                  Do you know of glarminy website about light sensitivity? I have been in contact with Uros, who made the site and suffers from a very widespread light-sensitivity comparable to the one local user @ensete described. I have tried the filters he offers and must say that they really do seem to help - https://glarminy.com/blue-filter-tester/
                                  For me as a photographer I need to do color accurate work, and already #7, which is clear, seems to give me some relief. Its still not perfect, but the discomfort does not develop into that stinging behind-the-eye pain and migraine.
                                  I still need to do more testing though, with a clear head, as when I didnt sleep well or hung-over, the symptoms are easier to start.
                                  I agree with @ensete now that the problem is probably color related. And unfortunately LEDs come in many colors, so this filter might not work on other devices. Currently testing it on iphone SE, which is unusally aggressive and even my healthy friends mentioned that something is wrong with the display.

                                  ensete it's definitely an interesting effect, but I havent had access to one since I've been focused in on LEDs etc

                                    MagnuM Perhaps avoidance isn't the best long-term strategy, but for a few years now,

                                    This was my strategy for a long time, however now that auto manufacturers have been plastering LED's all over their cars, the problem is no longer avoidable. I've taken a more active role signign up for class action lawsuits, contact auto manufacturers, trying to get the NHTSA to acknowledge the problem, getting my senators involved, but i'm getting pretty much nowhere. But I'll keep fighting. It's criminal to use a technology that hurts people and deploy it on public roadways.

                                    Do you know of glarminy website about light sensitivity?

                                    Never saw that before, I'll check it out. I have visited techsensitve.com which has some info on this. Edit: Just bought the kit, why not give it a shot

                                    I agree with @ensete now that the problem is probably color related.

                                    Another thing to realize is that LED's are banged out in cheap Chinese foundries at the lowest possible cost. Things like flicker, accurate color reproduction, color temperature, none of that is considered, just shaving the price down to as few fractions of a penny as possible. Cheap LED's definitely cause me way more problems and unfortunately we live in a world where cheap rules everything else.

                                      Let me know if the kit makes any difference to you. I am still testing but so far the result seems the same - number 7, which is only one I can use for color sensitive work, really seems to ease the pain. Its still somewhat annoying, might still have to look and focus elsewhere every once in a while, but it really seems to stop that main migraine and stinging headache I usually get from fully developing.

                                      Uros who runs the site has a table of commercial filters corresponding with each number. Ordered them and will see how that goes.

                                      degen What kind of doctor would you see for the jaw problem? I read in photophobia article on wikipedia that - Elevated trigeminal nerve tone (as it is sensory nerve to eye, elevated tone makes it over reactive). Elevated trigeminal tone causes elevated substance P which causes hypersensitivity. Often due to jaw misalignment.

                                      Id like to see someone to try and get it fixed or aligned differently, but have no idea which specialist would do such thing.

                                          dev