A paper came out in 2011 that gives one pause: "Light-emitting diodes (LED) for domestic lighting: Any risks for the eye?" by F. Behar-Cohen, et al. Progress in Retinal and Eye Research 30 (2011) 239-257.
"LEDs will most probably become the main light sources. Beside blue LEDs that are used commonly for decorative purposes, white LEDs provide retinal exposures to violet, indigo and blue light at much higher levels than in previous light sources. This is the first time that the population will be exposed to such substantial blue light. Whether such retinal exposure will induce increased macular degeneration? Aggravation of glaucoma neuropathy? Perturbations of circadian cycles? Nobody can say today, but when analyzing all the knowledge that has been accumulating on blue-light hazards, we cannot rule out a yet undiscovered risk for chronic day-long, life-time exposure since photochemical damages may not induce any visible changes but cumulatively induce photoreceptors loss. There is an urgent need for a better evaluation of potential light toxicity, depending on the different artificial light sources available, and upon chronic exposure of different populations to define clear guidelines for domestic light manufacturers."
I can't explain but I have also noticed that I have quite serious dizzyness and sore eyes EXCEPT when watching movies. I can watch a whole movie without an issue (like somebody else here, see old posts) but doing anything else is pain. Reading and web surfing is worst but it is bad in general.
As for me it is definitelly not high resolution, I am using other screens with higher resolution without an issue.
What puzzles me even more is that my connected external CCFL monitor seems to be harder than my old CCFL notebooks or combinatios of PC and external CCFL monitor.
Like there is something wrong in the Mac.
"I have MD in computer engeneering - so I know what you are talking about...I see here people with hipersensibility to blue spectrum, with hipersensibility to light and with sensibility po flicker."
Perhaps, Doctor, you know what you are talking about, but you have a difficult time with your spelling ("engeneering", "hipersensibility"), regardless of sensibility po flicker.
The post from jondrac, where he says that everything except gaming causes him discomfort, could perhaps be explained by the screen resolution changing with the games. Jondrac, you need to find out what graphic card settings a game uses and set these settings as general ones. The most obvious one is the resolution setting. If one non-native resolution didn't help, try a second one!
"What puzzles me even more is that my connected external CCFL monitor seems to be harder than my old CCFL notebooks or combinatios of PC and external CCFL monitor.
Like there is something wrong in the Mac."
You are NOT the first to say this. This is a very interesting and very puzzling observation.
I want to know, has anyone who has observed this tried the offending Mac with a Windows installation?
And can you tell me which cable(s) you have used to connect the Mac and the PC to the monitor?
Four months ago, I posted here a list of macbooks that I felt uncomfortable with https://discussions.apple.com/message/18704684#18704684. Unfortunately, I omitted one detail that seemed irrelevant to me back then because I was convinced that we are dealing with a hardware issue here. This weekend after upgrading my aging MacBook Pro from Snow Leopard to Mountain Lion and experiencing the same symptoms as I did with newer Apple hardware, I realized that software plays significant role in this problem. So, here is the updated list:
- MacBook, 13", Mid 2009, Leopard - no issues
- MacBook Pro, 13", Mid 2010, Snow Leopard - no issues
- MacBook Air, 11", Mid 2011, Lion - eye strain, headaches, motion sickness
- MacBook Air, 13", Mid 2011, Lion, panel LP133WP1-TJA1 - eye strain, headaches, motion sickness
- MacBook Air, 13", Mid 2011, Lion, panel LTH133BT01A03 - headaches, motion sickness
- MacBook Pro 13", Early 2011, Lion - headaches, motion sickness
- MacBook Pro, 15", Early 2011, Lion, panel LTN154BT08 - motion sickness
- MacBook Pro, 15", Early 2011, Snow Leopard, panel LP154WP4-TLA1 - no issues
- MacBook Pro, 15", Early 2011, Mountain Lion, panel LP154WP4-TLA1 - headaches, motion sickness
The last two entries are the same notebook! So, I am not sure what Apple changed between Snow Leopard and Lion, but it seems to negatively affect my ability to work with Mac OS X. Software problem could also explain how so many different panels from different manufacturers with different resolutions and sizes can affect me the same way.
I can think of four factors related to display that are controlled by software: color profile, font rendering, refresh rate and temporal dithering. I don't think it's color profile because I tried to change color profiles and calibrate displays and it doesn't seem to have any significant effect. Font rendering doesn't seem to be the culprit either because turning font smoothing on and off doesn't help. I don't know how to measure refresh rate for the internal monitor, so I cannot rule this out just yet. What I can clearly see is that temporal dithering changed between Snow Leopard and Mountain Lion. The gradient on Lagom.nl looks very different on Snow Leopard and Mountain Lion. The temporal dithering theory can also explain why many users here (including me) can watch movies and play some games on new laptops, but have difficulties looking at static images and text.
Last but not least, I am software developer and I really need to upgrade to Mountain Lion, so if anyone from Apple reads this and needs a guinea pig to figure this issue out, I would gladly fly to California, sign any NDA required, and spend as much time as needed testing different display settings. Just let me know.
iStrain, as thorough as ever! :)
Could this be major progress in the right direction? I think this plays well with recent discoveries of using non-native resolutions. Maybe also different versions of iOS play a part with problems people have with mobile devices?
I hope your post finds it's way to someone in charge of at least something. Heck, if we can pinpoint the issue maybe some software remedy can be conjured up.
This may indeed be software related.
I posted last week that I also had issues with other products that affected my eyes the very same way as with 2012/2011 mac laptops.
The issues were Sony Bluray players with the same menu software on each. I would experience eye strain on the newer, later models. (older models did not bother me at all). The PS3's menu I could not read either without experiencing the same eye strain issues.
Also, Windows 7 bothered me where as WinXP did not bother me on the same PC connected the very same way.
These two issues are very similar to the macbooks causing eye strain.
I have 20/20 vision after being examined by a optometrist and a neuro ophthalmologist. Could it be that I/we are seeing something that others are not? Because our eyes are 'that' good, they are causing us grief.
I always left it alone and thought it was the LED backlighting, but my bluray players were viewed on a LCD TV with CCFL backlighting. And my PC had a CCFL backlight as well. Now I believe it has to do with the text and/or the resolution.
Or a frequency issue.
If this hasn't already been posted, check out f.lux - http://stereopsis.com/flux/
It might help with your eye strain sensitivity. Very nice, especially at night or if you like working in a dim or dark room. Or if you just like a warmer display.