I have a 17" CRT and to do 1280x1024 it has to be run at 60Hz. I heard from somebody else that it should be around 75Hz at least otherwise it will damage your eyes. Is there any truth to this?
Will a low refresh rate damage your eyes?
- Thread starter KoolDrew
- Start date
It may give you headaches but i've never heard it damaging your sight. Looking at any computer screen for a long time is not good. You're supposed to let your eyes rest and occasionally focus on objects that are far away .
P.S. Get a bigger monitor.
P.S. Get a bigger monitor.
I've never heard of it damaging your eyes, although i find it easier to use a screen with a higher refresh rate for longer periods of time.
Can you get 75Hz at 1024x768? That's the resolution i run my 19" monitor at.
RoD
Can you get 75Hz at 1024x768? That's the resolution i run my 19" monitor at.
RoD
I think staring @ anything for a Marathon session could eventually effect your eyesight 
...But I do know when I was running 5 Monitors and 1 TV @ once even @ high refresh (but different) rates was giving me headaches and didn't know it till my Optometrist said so...went down to 3 and it relieved em
...But I do know when I was running 5 Monitors and 1 TV @ once even @ high refresh (but different) rates was giving me headaches and didn't know it till my Optometrist said so...went down to 3 and it relieved em 
RichUK
Lifer
- Feb 14, 2005
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Originally posted by: LED
I think staring @ anything for a Marathon session could eventually effect your eyesight
Uber gaming rig
Buying a new monitor is out of the question as I am saving up for a new rig. I will bve buying at least a 19" LCD for that
After a really long time they do, but I just wanted to know if it actually does do permanent damage.
If I run 1024x768 I can get a max of 85Hz. The highest I can go while keeping 75Hz is 1152x864, which I have it set at now. Also 1024x768 is way too small for me.
Yes.
If your eyes aren't bothered by it, don't worry about it.
CRTs "pulse" or flicker the light, that is, each pixel is actually lit sometime less than 1 ms of a frame, with the rest of the time being dark. So that 1 ms has to make up for the rest of the time being dark, so it's pretty bright. Some people are affected by this, and some are not. It's like being carsick, just some people are more susceptible to it. When you set a higher refresh rate, there's more pulses per second, so each one can be less bright, and hence your eyes are bombarded with less radiation during each flicker.
LCDs don't have that problem because the LCD only controls how much light gets through (effectively an electronic shutter), and the light is constant. That means that the brightness can be averaged over the whole time length of each frame, rather than all having to be at the beginning, so it's easier on the eyes. On the other hand, some people say they have eye problems when looking at LCDs that they don't with CRTs, but I don't know what's up with that one.
CRTs "pulse" or flicker the light, that is, each pixel is actually lit sometime less than 1 ms of a frame, with the rest of the time being dark. So that 1 ms has to make up for the rest of the time being dark, so it's pretty bright. Some people are affected by this, and some are not. It's like being carsick, just some people are more susceptible to it. When you set a higher refresh rate, there's more pulses per second, so each one can be less bright, and hence your eyes are bombarded with less radiation during each flicker.
LCDs don't have that problem because the LCD only controls how much light gets through (effectively an electronic shutter), and the light is constant. That means that the brightness can be averaged over the whole time length of each frame, rather than all having to be at the beginning, so it's easier on the eyes. On the other hand, some people say they have eye problems when looking at LCDs that they don't with CRTs, but I don't know what's up with that one.
Personally, my optimitrist says that the only 'adverse' effects from looking at the computer screen is that the muscles in your eyes get really 'tight' from staring at something so close for so long.
The same thing happens if you read a lot of books, though... ;-)
The same thing happens if you read a lot of books, though... ;-)
I believe strongly that it varies from person to person, but I also believe that after your eyes have been used to a certain refresh rate, something lower might cause head-aches or severe side affects.
I run 1024X768 @ 100hz and can lower it to 85Hz without noticing... However, once I drop down to 75 or 60hz, I get an instant head-ache and my eyes start wattering. Some people are not bothered by it, but I sure am.
I used to think people would make it up that they could see a difference. Until I myself experienced it and was able to prove it (Had someone change the refresh rate and I guess it) I could always guess it was 60-75, but anything above that was a clean image.
With that said, I am no eye doctor, but I am sure that working with computers heavily these last 10 years that my eyes have really gotten bad. I used to be able to drive without glasses about 10 years ago and now I can barely read my desktop without them
I run 1024X768 @ 100hz and can lower it to 85Hz without noticing... However, once I drop down to 75 or 60hz, I get an instant head-ache and my eyes start wattering. Some people are not bothered by it, but I sure am.
I used to think people would make it up that they could see a difference. Until I myself experienced it and was able to prove it (Had someone change the refresh rate and I guess it) I could always guess it was 60-75, but anything above that was a clean image.
With that said, I am no eye doctor, but I am sure that working with computers heavily these last 10 years that my eyes have really gotten bad. I used to be able to drive without glasses about 10 years ago and now I can barely read my desktop without them
yea its a personal preference really.. my dad can use a pc with the monitor at 60hz and i think he's insane. it just depends whether it hurts your eyes at all.
personally i need at least 85hz, anything lower i notice the flicker and its very irritating
personally i need at least 85hz, anything lower i notice the flicker and its very irritating
i agree. its best to sort of, look at other things every once in a while. especially things that are far away.
Yup, I'm the same way ArchAngel. I used to want to be a CRT tester for companies because my eyes were so sensitive to flicker - gasp, now the LCD revolution is crushing my dreams - sigh
well CRT's are bad for you regardless of the refresh rate, 75/60/doesn't matter to your eyes; those both aren't good for them. The only difference is we can see a flicker with 60, but not with 75.
If every 20 mintues you look 20 feet away for 20 seconds, your eyes should hold up ok as far as focus ability goes.
our eyes are meant to look at things reflecting light, not things producing it (ie florescing).
You don't notice the flicker past 70-ish because the image has a slight burn-in on our eyes....movies are only 24fps, but they display each fram 3 times. This way we get the 24 fps but dont' notice a horrible flicker.
If every 20 mintues you look 20 feet away for 20 seconds, your eyes should hold up ok as far as focus ability goes.
our eyes are meant to look at things reflecting light, not things producing it (ie florescing).
You don't notice the flicker past 70-ish because the image has a slight burn-in on our eyes....movies are only 24fps, but they display each fram 3 times. This way we get the 24 fps but dont' notice a horrible flicker.
I get headaches very quickly at 60hz, and at 75hz after extended periods. 75hz is the minimum I could use for work, where I use a computer often but not staring at the screen for any long period. 85hz was ab fine for me, though since switching to 100hz at home (where i do stare at the screen for long periods of gaming) I've noticed a significant reduction in frequency and intensity of headaches, and my eyes no longer feel uncomfortably tired at night. I'm pretty senstive to it, but I'd definately suggest anyone should use at least 75hz regardless, and should try to use a higher frequency if available.
edit: CRT btw, I dont think the same applies to TFT as pixels there fade into the next colour, unlike CRT's which just flash away.
edit: CRT btw, I dont think the same applies to TFT as pixels there fade into the next colour, unlike CRT's which just flash away.
That's exactly what my optometrist said. Since my eyes have been focussing on the computer screen for so many years, the muscles in them have adjusted to maintain that near focus. That's why my distant vision is so blurry now. She said it's possible (not guaranteed) to readjust the muscles in my eyes by spending more time focussing on distant objects, but that means less time on the computer so forget that!
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