1 94 95 96 97 98 Previous Next 2,032 Replies Latest reply: Jun 26, 2014 8:34 AM by luisx Go to original post Branched to a new discussion.
  • 1,425. Re: Eye strain from LED backlighting in MacBook Pro
    Jessiah1 Level 1 Level 1 (0 points)

    ElleAle, you bring up an interesting point, some people are sensitive to EMF and are having similar reactions but for a different reason. I believe we also have some people here who are experiencing eye strain causing headaches and some who are experiencing severe instant reactions causing intolerable migraines like myself. Anyone who is using any new LED screen in this forum for even 5 minutes without issue has soooooo much milder of an issue than I do personally. Here is a link about EMF and subliminal flicker you may find interesting, look through the articles link on this PHD's website to find the info I am referencing, his BIO is informative as well.

  • 1,427. Re: Eye strain from LED backlighting in MacBook Pro
    kvoth Level 1 Level 1 (0 points)

    Has anyone tried turning on the Grayscale accessibility feature of OSX?

     

    I was (uncharistaristically) using my laptop this morning and felt terrible, as normal, after an hour or two. I then decided to try turning on grayscale (in system preferences, accessibility). I'm feeling OK right now. Could be a coincidence?

     

    Anyone else want to give it a shot and report back how they feel?

  • 1,428. Re: Eye strain from LED backlighting in MacBook Pro
    ElleAle Level 1 Level 1 (0 points)

    Hi d1a

     

    which specific Dell monitor are you using? thank you

  • 1,429. Re: Eye strain from LED backlighting in MacBook Pro
    ElleAle Level 1 Level 1 (0 points)

    Thank you Jessiah1, I am checking it out

  • 1,430. Re: Eye strain from LED backlighting in MacBook Pro
    mvanier Level 1 Level 1 (0 points)

    I did.  It helps a bit but by no means solves the problem.  I'm curious about the high-contrast mode.  That should (in theory) do better but I suspect it will again do very little.

  • 1,431. Re: Eye strain from LED backlighting in MacBook Pro
    ElleAle Level 1 Level 1 (0 points)

    Kvoth, re grayscale:

     

    i tried that also for a couple of hours. It does seem to make things better. My eyes were very strained when I started but as the time went on they started relaxing more and more.  I will keep playing with this. Because as some people have noted before, it sometimes takes several hours and even couple days for me for the eyestrain to go away after I stop using the device that was stressing out the eyes. 

  • 1,432. Re: Eye strain from LED backlighting in MacBook Pro
    d1a Level 1 Level 1 (0 points)

    ElleAle & mvanier,

     

    It's a Dell E207WFPc with a Dell Studio Hybrid 140g running Windows7. I'm thinking to get the latest mac mini and using this monitor to see how it is, it was not good with mac mini 2006 though.

     

    I have other strong reactions to WiFi; dizziness, head preasure, lethargy, confusion...

    Even when I'm not on a computer, that's just from being in the vicinity of a WiFi enabled modem.

     

    Lucky for me I have an understanding boss and our work place is WiFi free. There is also interesting research on WiFi - http://www.wifi-in-schools-australia.org/

  • 1,433. Re: Eye strain from LED backlighting in MacBook Pro
    kvoth Level 1 Level 1 (0 points)

    ElleAle --

     

    Awesome news! It worked for me for the rest of the day. I'll continue to test it. Check back in a couple of days and let us know if it's still working.

     

    Jessiah, mvanier -- does grayscale work for you guys?

  • 1,434. Re: Eye strain from LED backlighting in MacBook Pro
    mvanier Level 1 Level 1 (0 points)

    Kvoth, grayscale definitely does _not_ work for me.  It does make the pain a bit more bearable, but it doesn't change the fundamental problem, which is a flickering display.

  • 1,435. Re: Eye strain from LED backlighting in MacBook Pro
    kvoth Level 1 Level 1 (0 points)

    Manvier --

     

    Have you tried it for an extended period of time? My theory is that it should reduce flicker, due to very little (if any?) dithering.

  • 1,436. Re: Eye strain from LED backlighting in MacBook Pro
    StefanD13 Level 1 Level 1 (0 points)

    Re: grayscale

     

    There is no guarantee, it may be the used gray colors are still not "primary" colors so the GPU and/or the display will still do dithering for more or less of them.

     

    I was thinking also that using no color calibration on both GPU and display should turn-off dithering as well, as long as the display is able to do at least 8-bit per color, but I have no idea how to reliably setup this.

     

    In the mean time my (lossless) frame grabber is on the way, if all works as I imagine, by checking a recorded image I should be able to tell at least which colors are not dithered.

     

    I actually think that there may be dithering algorithms that are OK, but for some combinations the brain recognize a kind of pattern with suggests that the object is moving, so the focus is distorted and the eye needs to refocus at a 60hz rate.

  • 1,437. Re: Eye strain from LED backlighting in MacBook Pro
    kvoth Level 1 Level 1 (0 points)

    StefanD13 ---

     

    I agree, it's still possible dithering is happening, but much less likely. It's much more likely that the display is capable of displaying them. Just because there really don't appear to be that many shades.

     

    Hey, so you should get in contact directly with me once you get that working. I'll send you over the kernel extension that is supposed to disable dithering on OSX.

     

    <Email Edited by Host>

  • 1,438. Re: Eye strain from LED backlighting in MacBook Pro
    digisup Level 1 Level 1 (0 points)

    @Eric Leung1

     

    Hi Eric,

     

    any chance you still have that green on black color profile? I have tried to set it up myself but I can't get it to work when switching to the inverted mode.

     

    Thanks in advance

     

    Job

  • 1,439. Re: Eye strain from LED backlighting in MacBook Pro
    StefanD13 Level 1 Level 1 (0 points)

    So, I have done now the first tests with the frame grabber, and they are negative.

    All recorded frames (one frame, one BMP file) on the DVI output are same (even when doing binary diffs on the BMPs), even in the configurations where I get eye strain (e.g. Linux with nouveau drivers).

    When using VGA output there are always slight differences between the frames, probably due to DAC, however seems not related to the eye strain since with that configuration I get no eye strain...

     

     

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