Ocular health

[anka]

Re: kindle

Hi Megan,

that was something i also considered but then one should not hold the thing in his/her hands or rest it on a body because of the emission (if i am correct) and also the size of display might not suit everybody. Can you tell me which kindle you have been using please?

 

[seek10]

Re: Spending many hours reading from an LCD? Tired eyes?

I have a lot of trouble reading large volumes of text on a backlit LCD screen. What works for me is the older Kindle that is not backlit.

I see the same problem with back lit tablet. some how it goes very slow, but it goes very fast on computer( probably got used to it).

 

[mcb]

Re: kindle

Hi Megan,

that was something i also considered but then one should not hold the thing in his/her hands or rest it on a body because of the emission (if i am correct) and also the size of display might not suit everybody. Can you tell me which kindle you have been using please?

It was the last model before the color displays came out. I can look up the model number for you later. The key to controlling EMF is to keep Wi-Fi turned off except when you are downloading (I absolutely refused to buy the model that had cellular data!). When that is off it is a very low power device, and that should help with the emissions. I don't have a good way to measure them, though.

With the cellular data model, all I could say is turn it off and leave it off. You can still load books using USB, I think. The last thing anybody needs is another cellular network data device in their lives.

 

[Palinurus]

Re: Spending many hours reading from an LCD? Tired eyes?

I had a similar problem in the early days when I just started using a laptop some six years ago.

What worked for me were some simple adjustments.

I dimmed the display considerably (less light to look at) and chose a greater and more agreeable font. I also ran the Clear type applet to fix incidental blurring issues.

If I'm not mistaken there is a thread somewhere about other adjustments of which I've forgotten the title and indication. Those had to do with a smoother transition from reading very late on PC and going to bed directly afterward. That's all I can recall.

Hope this helps a bit.

 

[buchsan]

Re: Vegetable Oils Linked to Macular Degeneration

Interesting. I just started adding Turnip Greens to my Green Drink to try to get the oils from the greens that is supposed to help prevent macular degeneration. I have had a lot of orders for the lectrochi ionic spa to Egypt and Abudabi because their doctor told them that heavy metals were causing childhood blindness and macular degeneration. I am not an eye doc and live in the US, so I don't know, just take orders. Do you think that might also be a possibility?

 

[Nook]

Re: Vegetable Oils Linked to Macular Degeneration

I'd say there are hundreds of thousands of people all over the world waiting for this advice. But since vegetable oil is ubiquitous, even with the advice, most will not likely heed the warning and eliminate these deadly oils from their diet. :(

Indeed, they won't. Most still believe that if it were true, it would be all over the 'health news'....yeah, right, because the MSM wants what's best for the people, right?

Interesting. I just started adding Turnip Greens to my Green Drink to try to get the oils from the greens that is supposed to help prevent macular degeneration. I have had a lot of orders for the lectrochi ionic spa to Egypt and Abudabi because their doctor told them that heavy metals were causing childhood blindness and macular degeneration. I am not an eye doc and live in the US, so I don't know, just take orders. Do you think that might also be a possibility?

Fwiw,

My 'Green Drink' I call broth of the bone.
All it includes is fat, water and marrow,
A delight so grand, 'tis warmth to the heart,
To your body and soul,
it gives the much needed strength.

Edit: no, buchsan, I don't think Turnip Greens or any other greens are advisable, let alone necessary.
There are many sources of info available on the forum, threads, books, etc that can provide you with more data

 

[Mrs. Peel]

Re: Spending many hours reading from an LCD? Tired eyes?

If I'm not mistaken there is a thread somewhere about other adjustments of which I've forgotten the title and indication. Those had to do with a smoother transition from reading very late on PC and going to bed directly afterward. That's all I can recall.

There is some software called f.lux that automatically dims your screen at sunset.

f.lux makes your computer screen look like the room you're in, all the time. When the sun sets, it makes your computer look like your indoor lights. In the morning, it makes things look like sunlight again.

Tell f.lux what kind of lighting you have, and where you live. Then forget about it. f.lux will do the rest, automatically.

 

[Palinurus]

Re: Spending many hours reading from an LCD? Tired eyes?

Thanks Mrs. Peel for helping out. I believe this one was on my mind when I wrote the above. :)

After a search I'm certain. ;)

Here is the thread I couldn't remember: http://cassiopaea.org/forum/index.php/topic,21346.0.html

 

[anka]

Re: Spending many hours reading from an LCD? Tired eyes?

Thank you very much, everybody, for your input.

I have gone through the post in the link (and also the sublink from Zadius Sky: Blue Light Makes People Alert at Night) - quiet some study. Surely going to bed before one is too tired, not straight from the computer screen, doing your excercise etc. - simply proper mental hygiene - is crucial, and I am trying my best there.

And from the mentioned sublink i figured out that the blublocker glasses is something worth trying for me because a proper light settings in the room and the monitor adjustment help only partly.

But back to the PulseWidthModulation issue in LED LCD screens. The link i gave in the opening of this thread is really worth reading for those who are very sensitive to flickering of their screen, caused by PWM technology, and want to find out more about the process behind it. It also gives a list of screen with no PWM at all or on a frequency higher than normal, 300-500Hz, which is supposedly sufficient for some people, but the nervous system is tricky and much more sensitive than eyes themselves, as you know, so i would opt for models that do not use the modulation at all. The prices are unfortunately very high, above €300 (since they are 24-27" size, check Amazon or Ebay for cheaper bids) and that makes it difficult to experiment with few models and see if it does what it should. I will order a cheap one and report back.

In the meantime, a very good computer test site that pays attention to this is
www.prad.de - look at:

http://www.prad.de/new/monitore/specials/backlight.html
(in German)

or the same text in awkward English

http://translate.google.com/translate?hl=en&sl=de&u=http://www.prad.de/new/monitore/specials/backlight-teil2.html&ei=zeHST62CAajx0gHd9pmHAw&sa=X&oi=translate&ct=result&resnum=1&ved=0CEwQ7gEwAA&prev=/search%3Fq%3Dprad.de%2Bpwm%26hl%3Den%26client%3Dsafari%26rls%3Den%26prmd%3Dimvns

Good evening*

 

[Palinurus]

Re: Spending many hours reading from an LCD? Tired eyes?

Anka, maybe you didn't notice it, but the prad website is available in English as well. Just click on the British flag in the upper left corner. No need to read crippled Google English for this one. ;)

 

[anka]

Re: Spending many hours reading from an LCD? Tired eyes?

Anka, maybe you didn't notice it, but the prad website is available in English as well. Just click on the British flag in the upper left corner. No need to read crippled Google English for this one. ;)

I did notice it but at the same time it is only a portion of their website that is available in English, just like the German, Spanish and French mutations of SOTT.net. And in case of the particular text about monitors and pulse-width modulation, i could not find the English version of it.

Also, in this link
http://cassiopaea.org/forum/index.php?topic=6643.msg222033#msg222033

which is mentioned in the thread that you gave earlier, i found the valuable info about the colors, wavelenghts and sight and since i adjusted my old screen to a warmer setting, i noticed yet another improvement in my eyes' comfort. So thanks for the hint ;)

 

[anka]

Re: Spending many hours reading from an LCD? Tired eyes?

Well, the discussion from the following forum goes still into more detail about LCD's and PWM. It includes some entries from the guy who's link i gave in the beginning of this thread.

_http://forums.anandtech.com/showthread.php?t=2248904

 

[anka]

Electrical Sensitivity research

This is already a bit away from the topic but i could not help because the site

_http://es-uk.info/research.asp

seems to provide many great studies related to electrical sensitivity, i.e.:

* Mobile phone radiation might alter protein expression in human skin
* The Effects of 884 MHz GSM Wireless Communication Signals on Self-reported Symptom and Sleep (EEG)
* Hearing of microwave pulses by humans and animals: effects, mechanism, and thresholds
* Diseases of modern living: neurological changes associated with mobile phones and radiofrequency radiation in humans

and many others so check it out for yourself.

 

[Persej]

Re: Spending many hours reading from an LCD? Tired eyes?

So far, the only manufacturers that guarantee that some of their monitors do not have PWM are EIZO (EV2736W, EV2436W, EV2416W, EV2336W, EV2316W) and BenQ (GW2760HS). For other manufacturers you will have to rely on reviews:

http://www.tftcentral.co.uk/reviews.htm
(Look under "Panel and Backlighting")

http://www.prad.de/new/monitore/testberichte.html
(Look under "Backlight")

http://www.svethardware.cz/monitory
(Look under "Interpolace, regulace podsvícení a spotřeba")

http://extrahardware.cnews.cz/monitory
(Look under "Regulace jasu")

http://www.overclockers.ru/reviews/monitor/
(Look under "Особенности (КЭ, ШИМ и др.)")

But beware that, because most manufacturers still do not guarantee that their monitors are PWM free, some models might have PWM even if they do not have it in reviews. For example, Dell S2440L:

http://www.tftcentral.co.uk/reviews/dell_s2440l.htm
(PWM free)

Same model in Germany and Russia:

http://www.prad.de/new/monitore/test/2012/test-dell-s2440l-teil6.html#Backlight
http://www.overclockers.ru/lab/50964_5/Za_steklom._Obzor_i_testirovanie_monitora_Dell_S2440L.html#19
(Not PWM free)

And yes, so far all PWM free models are big and expensive.

 

[anka]

Re: Spending many hours reading from an LCD? Tired eyes?

So far, the only manufacturers that guarantee that some of their monitors do not have PWM are EIZO (EV2736W, EV2436W, EV2416W, EV2336W, EV2316W) and BenQ (GW2760HS)

Hi Persej,

thanks very much for the extra info. I am no expert in this field and had to dive into researching this from scratch. Just want to add from what i found, to be precise, that EIZO provides the mentioned screens with a hybrid technology which uses PWM for brightness up to around 18-20%, but no PWM for the higher values. I think that is good enough from my point of view. For the 2013 models (or at least some), DELL is trying to catch up and use the same technology. Hopefully, other producers are already following and their competition will push the prices down and variety of sizes up.

Have still not decided what to go for, though. Probably have to spend around €350-400 to actually get 24inch one with 16:10 ratio which would be most suitable for studying needs (reading multiple texts for cross referencing). Until i make up my mind and prepare the wallet, stick with the books recommended by QFG. The list is bloody long to get through all of it

P.S. Nice to see some CZ links here ;)