1 39 40 41 42 43 Previous Next 2,032 Replies Latest reply: Jun 26, 2014 8:34 AM by luisx Go to original post Branched to a new discussion.
  • 600. Re: Eye strain from LED backlighting in MacBook Pro
    Dovez Level 1 Level 1 (0 points)

    Could you try the camera swing test with a non-native resolution on your MacBook Air and compare the results with the results of a native resoolution? Would both be interlaced?

  • 601. Re: Eye strain from LED backlighting in MacBook Pro
    CoreLinker Level 1 Level 1 (0 points)

    The interlaced pattern you're seeing when you zoom in is just the pixel grid.

  • 602. Re: Eye strain from LED backlighting in MacBook Pro
    Eric Leung1 Level 1 Level 1 (5 points)

    Doves, CoreLinker: I have done the following tests:

     

    1. Swinging the camera horizontally against a vertical line in native resolution (the standard swing camera test). I see a fat line interlaced.
    2. Swinging the camera horizontally against a vertical line in NON-NATIVE resolution. I see a fat line interlaced. The result of this test seems to be identical to Test 1.
    3. Swinging the camera vertically against a horizontal line in native resolution. I see a fat horizontal line with vertical interlace!
    4. Taking a photo of a vertical line normally without swinging the camera. I see a solid vertical line.
      I too had thought that it might be the pixel grid I was seeing, but the solid line seems to dis-proof that. I should see a dotted line if the camera picks up the pixel grid.
  • 603. Re: Eye strain from LED backlighting in MacBook Pro
    Eric Leung1 Level 1 Level 1 (5 points)

    Came across this article today: Bright Light Worsens Migraine (http://www.livescience.com/6018-bright-light-worsens-migraine-headache-pain.html )

     

    I wonder if our problem relates to some kind of migrane, and the LED light is a trigger to our migrane neurons.

    It sounds so similar to our problem when it mentions that the migrane neurons are activated even after the light are removed, and "patients say that their headache intensifies within seconds after exposure to light, and improves 20 to 30 minutes after being in the dark".

  • 604. Re: Eye strain from LED backlighting in MacBook Pro
    CoreLinker Level 1 Level 1 (0 points)

    Eric, there are two reasons why you're not seeing the grid.

     

    1) You're not holding the camera still. Use a tripod or prop it onto something.

    2) Glare. Increase the shutter speed.

     

    Believe me, it IS the grid. :)

  • 605. Re: Eye strain from LED backlighting in MacBook Pro
    Eric Leung1 Level 1 Level 1 (5 points)

    Hahahaha, ok!

    I'll do that test again later to convince myself

  • 606. Re: Eye strain from LED backlighting in MacBook Pro
    Exandas Level 1 Level 1 (0 points)

    Hi to everyone, i experienced the same feeling of diziness as with the MBP when i used my ccfl screen after an upgrade to win 8 in my job pc. With win 7 pro i could work for many hours without a problem, but as soon as i upgraded to win 8, 30min of work causes me blurry vision and diziness. Is it possible that software is the cause to macs as well instead of led backlight?

  • 607. Re: Eye strain from LED backlighting in MacBook Pro
    Dovez Level 1 Level 1 (0 points)

    There can be no doubt anymore. It is not a backlight problem. The problem lies in how the OS or graphic card drivers are controling the content of the LCD screen.

     

    I thought that the problem might have been in the quantity of LED, which might have been set to flicker not in synch, but if the same issue persists with CCFL backlights, which on avarage have only 2 tubes, then that can't be the case. With pixels, however, you can easily control them individually to do anything you want if you are an OS.

     

    I think installing an older graphic card driver might solve it. Exandas, I know it's too much to ask, but could you see if looking at the BIOS screen causes dizziness. The Windows drivers should not have loaded yet when you are in the BIOS menu.

  • 608. Re: Eye strain from LED backlighting in MacBook Pro
    iobe Level 1 Level 1 (0 points)

    I have another anecdote that speaks for the issue being in software:

     

    My 2011 MBP anti-glare has worked very well the whole time, both in OS X, in Parallels and in Bootcamp with Windows 7. A few days ago I installed Windows 8 in Bootcamp and now I get eye strain from it. Back in OS X I'm still fine.

  • 609. Re: Eye strain from LED backlighting in MacBook Pro
    Eric Leung1 Level 1 Level 1 (5 points)

    With all respects, I disagree the believe that the problem lies only in software.

     

    There have been so many cases reporting that changing a LED montior to a CCFL monitor could ease the eye strain immediately, and that's clearly a hardware issue.

     

    I think there are multiple causes for our eye strains, Windows 8's (faulty (?)) graphics driver could be one of them.

     

     

     

    iobe: May I know if you get the same eye strain if you use Windows 8 in Parallels?

  • 610. Re: Eye strain from LED backlighting in MacBook Pro
    Exandas Level 1 Level 1 (0 points)

    My eyes have not fully adjusted from the effect of using my desktop for a few hours, but i think that my eyes feel much more comfortable when viewing the BIOS screen! I will check it again tomorrow when my eyes have adequately rested.

    It seems it could be the software, but why? Is it font rendering?

  • 611. Re: Eye strain from LED backlighting in MacBook Pro
    iobe Level 1 Level 1 (0 points)

    Eric:

    I don't have any problems with Windows 8 in Parallels.

     

    Regarding hardware vs software - software controls what the hardware does, so a change in software could cause the hardware to do something else.

  • 612. Re: Eye strain from LED backlighting in MacBook Pro
    CoreLinker Level 1 Level 1 (0 points)

    Has anybody tried changing the color bit settings, see if that would help?

  • 613. Re: Eye strain from LED backlighting in MacBook Pro
    Eric Leung1 Level 1 Level 1 (5 points)

    If there's no problem with Windows 8 in Parallels, then it sounds like it's the graphics driver problem when Windows is running natively.

    Perhaps can try different color bit like what CoreLinker has suggested?

    Or maybe try different acceleration settings? Or clear type font settings? I guess that might change the sub-pixel rendering in some way.

     

    Regarding hardware vs software, I agree that software can controls what the hardware does to some extent. But from my personal experience as well as many others who reported about the significant improvement after changing their LED to CCFL displays, I believe that's pretty sure to be related to the hardware rather than software.

     

    Again, I believe there're more than one cause for our eye strains.

  • 614. Re: Eye strain from LED backlighting in MacBook Pro
    Dovez Level 1 Level 1 (0 points)

    So far I see two problems: PWM and this mysterious software problem.

     

    Perhaps this software problem only is there with certain monitors. It could be that some monitors support this software manipulation and others don't. So older CCFL LCDs could be immune against  this problem, while newer LEDs will all have this problem. It's only a theory, but it could be. I think it could be that it is not so much the operating system that is fault as the drivers that come with it. I've heard people being fine with Windows XP but not with Windows 7 with the same hardware. Now I read about Windows 7 being good, but the problem satrting with Windows 8. This makes me think that any OS could have this problem with the wrong graphic card drivers. Installing the oldest drivers might remove the problem. I would also try 256 color mode. No dithering should be happening there.

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