1 80 81 82 83 84 Previous Next 2,032 Replies Latest reply: Jun 26, 2014 8:34 AM by luisx Go to original post Branched to a new discussion.
  • 1,215. Re: Eye strain from LED backlighting in MacBook Pro
    kvoth Level 1 Level 1 (0 points)

    CT wrote:

     

    Maybe reset the SMC?

    CT, it looks like you may work for Apple?

     

    This situation is not as simple as resetting the SMC. If you do work for Apple, could you please raise this issue to the right teams? This is a very serious issue.

     

    <Edited By Host>

  • 1,216. Re: Eye strain from LED backlighting in MacBook Pro
    LovesDogs0415 Level 1 Level 1 (0 points)

    Warning: I had been able to use my husband's iPhone 4S with no problem.  I purchased my own and have been using it with acceptable success.   HOWEVER, he downloaded the new IOS 7 and it seems to make the screen brighter.  Same device, but brighter, and it immediately made my eyes uncomfortable.  I am not going to take the chance on my phone and download the new IOS.  I'm sticking with the old one.  His brightness settings remain the same but the phone is brighter. 

  • 1,217. Re: Eye strain from LED backlighting in MacBook Pro
    Jessiah1 Level 1 Level 1 (0 points)

    Interesting, somehow they are trying to make the older phones render more like the 5 I think, make it crisper and brighter. IMO new LED screens often look pixilated, like the movie 300, all grainy and spotty...I think my perception is part of why my eyes cannot focus.

  • 1,218. Re: Eye strain from LED backlighting in MacBook Pro
    CT Level 6 Level 6 (15,535 points)

    Interesting.  Maybe consult an optometrist?

  • 1,219. Re: Eye strain from LED backlighting in MacBook Pro
    Jessiah1 Level 1 Level 1 (0 points)

    CT, it's rather obvious you have not read back through much of this thread before responding to the comments here and I would suggest you do so if you truely have a desire to make any constructive inputs to the conversation.

     

    Most people posting in this thread have been to many Doctors, I have posted about my experience with Neurologist's (Headache specialists), opthamologists, optometrists and ENT Doctors only a few pages ago and so have others. I have posted about being on long term disability in recent pages as well, we have all discussed possible medical conditions that could cause our issue and there is no conclusive diagnoses at this time.

     

    Respectfully Jesse

  • 1,220. Re: Eye strain from LED backlighting in MacBook Pro
    ArtechokiQ Level 1 Level 1 (0 points)

    Kvoth and Jessiah1 please check out following links:

     

    http://www.conradbiologic.com/articles/SubliminalFlickerI.html

    http://www.conradbiologic.com/articles/SubliminalFlickerII.html

     

    Did any of you go to the doctors and have any of you done any blood test, that includes checking your sugar levels, checking your thyroid (antibodies count) and ammonia levels in your blood.

     

    Please check the following links:

    http://en.wikipedia.org/wiki/Meniere's_disease

    http://en.wikipedia.org/wiki/Hepatic_encephalopathy

    http://en.wikipedia.org/wiki/Fluorescent_lamps_and_health

    I am not saying you have any of these, as a matter of fact the second one is pretty bad, and most likely you dont have it, but its worth looking into just to exclude things for sure.

     

    Does lowering salt in your diet help?

    Does lowering sugar in your diet help?

    Does lowering or increasing fluids in your diet help?

    Are you prone to infections? Ear infections?

    Did any of these symptoms I have mentioned before occur at the onset of puberty?

     

    Also check out this:

    http://www.tftcentral.co.uk/articles/pulse_width_modulation.htm

    http://www.prad.de/en/monitore/specials/backlight.html

     

    Did any of you try to use any of the following computer monitors:

    http://www.tftcentral.co.uk/articles/flicker_free_database.htm

    Dell U2713HM seems like a best candidate!

     

    Please just check all this out and inform yourself, I am in no way trying to diagnose you. As a matter of fact I have no clue what exactly is happening but I certainly know something is going on. Dont let people dismiss this as eyestrain or even worse tell you its all in your head! This is a serious matter.

  • 1,221. Re: Eye strain from LED backlighting in MacBook Pro
    Jessiah1 Level 1 Level 1 (0 points)

    Good information, most of the links have been posted at some point or another, the TFT link on PWM is a good read.

     

    To answer your medical questions, I have posted my information before but this is a long thread

     

    I do not have meniere's disease, my blood work is clean and good with no liver issues or low levels of any nutrients. I have tried everything diet wise, even gluten free which I have continued simply because I feel healthier. None of these thing's have helped, neither has the depakote my Neurologist has me taking.

     

    The only real evidence I have heard of my condition is an optomitrist who believes my eyes "focus hard" meaning they are aggressive at focusing. Most data point's to head trauma from what I have read and the theories of my Neurologist. I have created an entire website about this issue with a page full of links just like the ones you have provided, I commend you for putting in some real inputs even if some of them are repeats

  • 1,222. Re: Eye strain from LED backlighting in MacBook Pro
    Jessiah1 Level 1 Level 1 (0 points)

    The first link ARTECHOKIQ posted in his response is a good one I have not found in my research that sums up many pages of various material I have read into one article. Everyone here should read that page, it is clear and concise about why flicker is an issue despite the manufactures claims of "flicker free" or high Hz rates.

     

    Thanks you Art

  • 1,223. Re: Eye strain from LED backlighting in MacBook Pro
    Jessiah1 Level 1 Level 1 (0 points)

    The one thing I will comment on after reading the 2nd link is this paragraph: All LED lights cause severe symptoms for me, even the newer ones that appear to be yellow! So I am not interested in LED lights replacing all CFL bulbs, with anti-glare coated glasses I can tolerate fluorescent bulbs for hours but they do not work for more than 5 minutes with LED bulbs. I will contact the author as well, thanks again Art.

     

    Hopefully LED lighting will become less expensive to the point where they can replace compact fluorescents. Some of the newest LEDs just becoming available have a natural, warm and pleasant color. Theoretically LEDs can be flicker and EMF free, but unless the electronic engineers who design their power supplies develop a biological conscience, they will use switching-type supplies (which are high in EMF) and will operate the LEDs in pulsed DC mode (which will generate additional large amounts of EMF).

  • 1,224. Re: Eye strain from LED backlighting in MacBook Pro
    kvoth Level 1 Level 1 (0 points)

    ArtechokieQ

    Kvoth and Jessiah1 please check out following links:

     

    http://www.conradbiologic.com/articles/SubliminalFlickerI.html

    http://www.conradbiologic.com/articles/SubliminalFlickerII.html

     

    Thanks a lot, I'll spend some time reading these.

     

    Did any of you go to the doctors and have any of you done any blood test, that includes checking your sugar levels, checking your thyroid (antibodies count) and ammonia levels in your blood.

    Yah. I have gone to so many different doctors. I've done two blood tests, One for normal stuff which checks sugar levels, thyroid, and ammonia. Another that checks for rare stuff. The doctors said my blood work was very healthy.

     

    Please check the following links:

    http://en.wikipedia.org/wiki/Meniere's_disease

    http://en.wikipedia.org/wiki/Hepatic_encephalopathy

    http://en.wikipedia.org/wiki/Fluorescent_lamps_and_health

    I am not saying you have any of these, as a matter of fact the second one is pretty bad, and most likely you dont have it, but its worth looking into just to exclude things for sure.

    I used to think that my symptoms were vertigo. In addition to having seen 3 ENTs so far, I was recommended to a well-respected neurologist specializing in inner ear. They did quite a number of tests on me and concluded I had no inner ear issues. So Meniere's is out.

     

    Blood work said that my liver looks great, so I guess Hepatic is out.

    Does lowering salt in your diet help?

    Does lowering sugar in your diet help?

    Does lowering or increasing fluids in your diet help?

    Are you prone to infections? Ear infections?

    Did any of these symptoms I have mentioned before occur at the onset of puberty?

    I haven't tried lowering salt or sugar. I do drink an excessive amount of water to make me feel good -- 1 gallon/day. I had a lot of ear infections as a kid, they had to put tubes in my ears (before puberty). But none of the symptoms I am having now were present then.

     

    Also check out this:

    http://www.tftcentral.co.uk/articles/pulse_width_modulation.htm

    http://www.prad.de/en/monitore/specials/backlight.html

    Thanks, I'll give those a read.

    Did any of you try to use any of the following computer monitors:

    http://www.tftcentral.co.uk/articles/flicker_free_database.htm

    Dell U2713HM seems like a best candidate!

    I ordered the Dell u2413 yesterday. I hope to have it in a few days. I'll report back on how it feels.

    Please just check all this out and inform yourself, I am in no way trying to diagnose you. As a matter of fact I have no clue what exactly is happening but I certainly know something is going on. Dont let people dismiss this as eyestrain or even worse tell you its all in your head! This is a serious matter.

    Thanks a lot for your help and support. I'm actually driving across the country to go meet with a good opthamologist who is aware of, and wants to do more research into this issue. Also, Jessiah and I are in direct contact and he has been an outstanding resource.

  • 1,225. Re: Eye strain from LED backlighting in MacBook Pro
    Jessiah1 Level 1 Level 1 (0 points)

    I spoke with Richard Conrad PHD, he is an interesting man and very scientific in his approach. He himself suffers from flicker sensitivity and other issues, I also forwarded him a link to this thread. Not sure what will come of it but I believe there is a lot of helpful information just in his website that people here could try.

  • 1,226. Re: Eye strain from LED backlighting in MacBook Pro
    ArtechokiQ Level 1 Level 1 (0 points)

    Kvoth be carefull Dell u2413 uses an 8-bit panel and FRC.

    Now 8-bit panel is OK but FRC is a method that is called dithering.

    This way an 8-bit panel together with FRC simulates a 10-bit panel.

    10-bit has more colors than 8-bit. Manufacturers dont want to put a true 10-bit panel inside a monitor because of cost, so they invented a method called FRC.

    FRC flickers different shades of color to get more colors. This may be bad because god knows what frequencies they are using for mixing different shades of a color.

     

    If I was you I would try the following. Test the monitor with lower amount of colors, and then test it with high colors. See if the change affects you. Dell u2413 doesnot use pwm if you set the brightness at more than 20%. Also try to lower the Color temperature (Make it more red than blue).

     

    Please people I know you guys are knowledgable about this and maybe I am talking too much in detail as if this was not mentioned before, but it is better to be repetitive.

     

    By the way my background is PhD in physics. I study Optics and teach Astronomy. I have been influenced negatively by flicker ever since I was 13 years old. (I remember falling on my head hard two times around then).

     

    Honestly I have a feeling PWM has a big influence on us. But as any other physicist would say nothing works without a physical proof. It is hard to get a physical proof from regular doctors (My thyroid test came yesterday, everything is ok they say as always). All we know a problem exists and therefore requires a solution. By excluding things that are not bothering us maybe we can narrow down onto sth.

     

    http://www.pchardwarehelp.com/guides/ipsmonitor/U2413-review.php

  • 1,227. Re: Eye strain from LED backlighting in MacBook Pro
    kvoth Level 1 Level 1 (0 points)

    No Way! Nooooo!

     

    I thought the 2413 was a 12 bit monitor! The u2410 said it was 12 bits.

     

    http://www.dell.com/ed/business/p/dell-u2410/pd

    Amazing Colour Gamut and Colour Depth: A higher color gamut of 1.07 billion colors allows for an astonishing range of colors to be displayed. The high data accuracy of 12-bit internal processing helps to distinguish very low grayscale tones, allowing for a greater level of detail in dark areas.

    Oh my gosh I feel so ripped off. So, does the 27" modey have 12 bits?

  • 1,228. Re: Eye strain from LED backlighting in MacBook Pro
    kvoth Level 1 Level 1 (0 points)

    Also, does their marketing blurb saying that it's 12-bit actually mean hardware 12-bit color without FRC?

     

    Thanks a lot. I'm going to try to find a 2410, they are hard to find.

     

    EDIT: The answer to my question is here: http://www.tftcentral.co.uk/reviews/content/dell_u2413.htm#model_comparison The 2410 is an 8-bit I believe with FRC making it 10-bit. The 12-bit is not the color channel bits. SO, 2410 is not what I thought it was.

  • 1,229. Re: Eye strain from LED backlighting in MacBook Pro
    ArtechokiQ Level 1 Level 1 (0 points)

    I contacted Richard as well last year via email, he wanted to talk with me but I was so seriuosly disabled by the lights at my university that I could not even get back to him. What was more interesting is that around the same time I could trigger my symptoms with coffee without exposing myself to lights. I am somewhat feeling better with lower salt in my diet and proper sleep helps tremendously. I have a computer monitor "NEC ea231wmi" that is run by a CCFL back light and uses an 8-bit dither-free panel. I was able to overclock it to 82Hz refresh rate via display port. It helped a lot but after one year even this one is slowly starting to give me trouble. Using windows operating system on it makes it worse than if I use Ubuntu for example. So this may not only be a hardware issue. There is an operating system call Crunchbang Linux that suits me best. However I could only manage to overclock it to 75Hz in Linux.

     

    Here is a webpage of a guy testing different monitors for PWM by using a photodiode and an oscilloscope. I will try to do the same here, the webpage is in bulgarian however, just watch the videos.

    http://www.retropcmania.com/2012/11/pulse-width-modulation-in-lcd.html

     

    There is a video in there that shows him using a software which actually increases PWM on a monitor. It is called IntelPWMcontrol and works only on intel graphics cards with LED backlights. It took me a while to find this software online. And one has to be really careful when downloading sth from a website in russia.

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