do crt damage your eyesight?

[konakona]

call me old fashioned, but LCDs get me tired after a while, never had that problem with my CRTs. granted, i always used mitsu/sony tubes for past 7 years or so.

my eyesight is pretty bad, but it wasnt a monitor that caused it; sat too close to the tv as a kid at least it hasnt degraded at all in past 6-7 years, if that says something about the CRT monitors i have used.

 

[yhelothar]

Originally posted by: Zephyr106

Oh yeah, they also look sexier because of because of their elegance, but I don't want the sky in my game to be gray, not green because of bad color reproduction.

This is news to me. Which LCDs have you used and have this problem? My LCD monitor has better color reproduction than most CRTs I've seen.

Zephyr

CRTs generally do have more accurate color reproduction than LCDs, that's why it's generally preferred by graphic designers.

Seriously, nothing is more accurate than my FD Trinitron 21" on sRGB mode, this thing is bit for bit accurate as my printouts.



Today's CRTs are built that they pass at 1% the emission of the minimum allowable emmission from TCO safety standards, WELLL BELOW THE LEVEL OF SAFETYNESS!

The amount of radiation that comes out your CRT is less than the light that is reflected off your walls at the daytime..

 

[AnnoyedGrunt]

Eyestrain is more related to the quality of the display, and how long you stare at it, VS the type of display.

A high quality, clear CRT running @ 75 Hz or above will probably not give any more eyestrain than an LCD (some people are more sensitive to refresh than others). However, a CRT with poor convergence will never look clear and will be difficult to read and will probably cause headaches simply becaues you are focused on the screen so strongly.

Since LCD's don't have the same refresh or convergence problems that CRT's have, many people find them much easier to read.

However, if you stare at an LCD for a long time without re-focusing on something further away, you will tire your eyes just the same as if you were working on a CRT.

I personally like the look of the LCD's, but prefer the higher resolution and variable resolution of the CRT's. I am therefore running a Viewsonic P95f+ CRT and am liking it quite a bit.

Once we get to 1600x1200x12ms LCD's with 24bit color, I will be ready to go (when they are under $500, too).

-D'oh!

 

[Nebor]

Yes, CRTs damage most peoples eyesight. The image on a CRT Is projected, and is flickering very quickly. It moves ever so slightly, jittering if you will, as it flickers and refreshes. Because of this, your eye can never actually focus in on hard edges of text, and your eye goes in and out of focus. It's the same effect you'd get as a kid from sitting in front of the TV all day, just a general type headache. Over time, this can damage your vision.

Just look at the percentage of people with vision correction in any IT field.

 

[yhelothar]

Originally posted by: Nebor
Yes, CRTs damage most peoples eyesight. The image on a CRT Is projected, and is flickering very quickly. It moves ever so slightly, jittering if you will, as it flickers and refreshes. Because of this, your eye can never actually focus in on hard edges of text, and your eye goes in and out of focus. It's the same effect you'd get as a kid from sitting in front of the TV all day, just a general type headache. Over time, this can damage your vision.

Just look at the percentage of people with vision correction in any IT field.

Stop spewing bullshit.
Go find me ONE article that backs up the bs you just said.

 

[VirtualLarry]

Originally posted by: Nebor
Yes, CRTs damage most peoples eyesight. The image on a CRT Is projected, and is flickering very quickly. It moves ever so slightly, jittering if you will, as it flickers and refreshes. Because of this, your eye can never actually focus in on hard edges of text, and your eye goes in and out of focus. It's the same effect you'd get as a kid from sitting in front of the TV all day, just a general type headache. Over time, this can damage your vision.

Just look at the percentage of people with vision correction in any IT field.

Heh. Well, it could have had something to do with, in my case, staring at a 14" 'SVGA' CRT, running in 1024x768 @ 43Hz Interlaced mode, for something longer than 6 years, I think it was.

By that time, the "white" on the screen wasn't even white anymore, it was kind of sad yellowy-tannish color. I guess the phosphors of the screen had actually worn down that much. The corners had become mucho-blurry as well. Oh yeah, I was already strongly nearsighted, I guess much moreso now.

After that I went to a 19" MAG, 1600x1200 @ 66-70Hz, that was much nicer, and due to the sharp focus and good dot-pitch, I had no problem reading the text on that screen. Cost $500 though, and it only lasted 2.5 years or so, before it "blew up", and let out the Magic Smoke. Been living with used "junker" monitors since then. I'd rather pay $20-50 for a used-but-decent monitor every year or two, rather than drop $500 and have it die after a couple of years. I figure in another year, 17" LCDs should drop to nearly $100-150, might as well pick up a couple then.

 

[konakona]

Originally posted by: Nebor
Yes, CRTs damage most peoples eyesight. The image on a CRT Is projected, and is flickering very quickly. It moves ever so slightly, jittering if you will, as it flickers and refreshes. Because of this, your eye can never actually focus in on hard edges of text, and your eye goes in and out of focus. It's the same effect you'd get as a kid from sitting in front of the TV all day, just a general type headache. Over time, this can damage your vision.

Just look at the percentage of people with vision correction in any IT field.

i thought someone already proved you wrong in another thread.

 

[VIAN]

Oh yeah, they also look sexier because of because of their elegance, but I don't want the sky in my game to be gray, not green because of bad color reproduction.

http://anandtech.com/displays/...oc.aspx?i=2072&p=7
It wasn't green it was blue.

Yes, CRTs damage most peoples eyesight. The image on a CRT Is projected, and is flickering very quickly. It moves ever so slightly, jittering if you will, as it flickers and refreshes.

That's because your CRT sucked. Mine doesn't do that.

 

[ViennaMan]

Many of you are saying older CRTs may damage eyesight, but newer ones don't really.

I'm having an older one I bought in 97 for $1000 shipped over here to europe. I don't really remember what model it is because I haven't seen it in quite some time, but it's a sony trinitron, barely used.

I'm starting to have a few eye problems with my current LCD, probably because I keep it so close to my face and I don't want to damage my eyesight any further with an old CRT. Will this older, but very good quality one, damage my eyesight more than newer cheaper ones?

 

[naruto1988]

been using CRTs over the years and my eyes have lost their vision...but after a year of use on an LCD, my eye prescription hasn't changed one bit. we'll see the true results of LCD if my eye prescription doesn't change after another year.

 

[Jeff7]

Originally posted by: naruto1988
been using CRTs over the years and my eyes have lost their vision...but after a year of use on an LCD, my eye prescription hasn't changed one bit. we'll see the true results of LCD if my eye prescription doesn't change after another year.

My prescription hasn't changed since I switched to the 21" CRT I've got now, with it's super-high refresh rates.

The bit that there's a lot of people in the IT field with corrective lenses....well, this stereotype has preceded computers. "Bookworms" were often shown as wearing glasses. No flickering involved there.

 

[VIAN]

Most people that buy LCDs because they say CRTs hurt their eyes is because they are novice windows users who have no idea what a refresh rate is. So they don't take advantage of it.

Refresh rates people. 85 rules and 120 is even better for playing games with vsync on.

 

[MadOni0n]

Well i was real bent on getting a good LCD, but after reviewing this topic.. i think i might get a good high end CRT .20 dot 19" and set it on a nice 100+ refresh rate instead?

 

[Tab]

The image on a CRT is being constanltly refreshed at the rate you set it at. It is being refreshed horizontally and vertically. There is a electron gun that is constantly shooting and going back and forth at a very fast rate. Your eyes subconciously are constantly in and out of focus when you look at a CRT monitor, because the image isnt constantly on the monitor. LCDs do have refresh rates but the entire image is redrawn.

 

[yhelothar]

Originally posted by: Tabb
The image on a CRT is being constanltly refreshed at the rate you set it at. It is being refreshed horizontally and vertically. There is a electron gun that is constantly shooting and going back and forth at a very fast rate. You're eyes subconciously are constantly in and out of focus when you look at a CRT monitor, because the image isnt constantly on the monitor. LCDs do have refresh rates but the entire image is redrawn.

Why did you just repeat the bs nebor said?

Yeah I'm sure your eyes can go in and out of focus 100 times a second :roll:

 

[VIAN]

if you don't see flickers, it doesn't matter

you should probably experience with a CRT first anyway, because I'm pretty sure you can return them where as you can't return LCDs because of how delicate they are.

 

[Noid]

Does'nt a CRT burnout faster using a higher refresh rate?
(sorry OT)

I been wearing glasses since I was 4. (all my life lol)
anyway ....
I been looking at a CRT for more than 8 hours a day since 1985.
Not so much on weekends tho.
(since I got my first job outt of college ... so thats around 19 yrs now)
I just got an eye exam today.
My eyes are healthy.
But, I need bifocal glasses now.
MY optometrist says I suffer from a normal aging process .... lol

I'm my opinion. I damage my eyes more on the latenite weekends.
(smoke is nasty)

 

[MadOni0n]

lol

 

[Tab]

Originally posted by: virtualgames0

Originally posted by: Tabb
The image on a CRT is being constanltly refreshed at the rate you set it at. It is being refreshed horizontally and vertically. There is a electron gun that is constantly shooting and going back and forth at a very fast rate. Your eyes subconciously are constantly in and out of focus when you look at a CRT monitor, because the image isnt constantly on the monitor. LCDs do have refresh rates but the entire image is redrawn.

Why did you just repeat the bs nebor said?

Yeah I'm sure your eyes can go in and out of focus 100 times a second :roll:

So you've got proof that says otherwise? I'd like you to put the bullsh1t in bold for me. Tell me where I lied. Our eyes can see more than 500 FPS even more than that. Why makes you think we cant see 60 cycles per second?

 

[Tab]

Originally posted by: VIAN
if you don't see flickers, it doesn't matter

You dont see gamma rays, it doesn't matter though... :roll:

 

[konakona]

looks like people have different tolerance levels for different aspects of display qualities. i feel much more comfortable on CRTs and i am not alone in this thread.

best thing to do would be going around big stores checking out display models. be warned tho, some of them are worn out and dont really do the justice. in other words check out couple of places to be sure

 

[Tab]

Agreed, most of the time the displayed are off one poor signal...

 

[yhelothar]

Originally posted by: Tabb

Originally posted by: virtualgames0

Originally posted by: Tabb
The image on a CRT is being constanltly refreshed at the rate you set it at. It is being refreshed horizontally and vertically. There is a electron gun that is constantly shooting and going back and forth at a very fast rate. You're eyes subconciously are constantly in and out of focus when you look at a CRT monitor, because the image isnt constantly on the monitor. LCDs do have refresh rates but the entire image is redrawn.

Why did you just repeat the bs nebor said?

Yeah I'm sure your eyes can go in and out of focus 100 times a second :roll:

So you've got proof that says otherwise? I'd like you to put the bullsh1t in bold for me. Tell me where I lied. Our eyes can see more than 500 FPS even more than that. Why makes you think we cant see 60 cycles per second?

Uh what does how many frames our brain can proccess a second have to do with how fast your eyes go in and out of focus?
Gawd some people have no logic... :disgust:

You dont see gamma rays, it doesn't matter though...

You show it here too, WTF does gamma rays have to do with a flickering screen?
Gamma rays is PROVEN to do damage to your body, while a flickering screen is NOT.

 

[Tab]

Originally posted by: virtualgames0

Originally posted by: Tabb

Originally posted by: virtualgames0

Originally posted by: Tabb
The image on a CRT is being constanltly refreshed at the rate you set it at. It is being refreshed horizontally and vertically. There is a electron gun that is constantly shooting and going back and forth at a very fast rate. Your eyes subconciously are constantly in and out of focus when you look at a CRT monitor, because the image isnt constantly on the monitor. LCDs do have refresh rates but the entire image is redrawn.

Why did you just repeat the bs nebor said?

Yeah I'm sure your eyes can go in and out of focus 100 times a second :roll:

So you've got proof that says otherwise? I'd like you to put the bullsh1t in bold for me. Tell me where I lied. Our eyes can see more than 500 FPS even more than that. Why makes you think we cant see 60 cycles per second?

Uh what does how many frames our brain can proccess a second have to do with how fast your eyes go in and out of focus?
Gawd some people have no logic... :disgust:

1)You haven't proved me wrong anwhere, you didnt show me any proof of "BULLSH1T".
2).You're infact insulting me, good job.
3)You should read my actual post. When you go outside, do you tell your eyes to automatically audjust for the increased brightness? No, you dont.

Originally posted by: Tabb

Originally posted by: VIAN
if you don't see flickers, it doesn't matter

You dont see gamma rays, it doesn't matter though... :roll:

I was commenting on the fact that if you don't see something it still matters...

Gamma rays is PROVEN to do damage to your body, while a flickering screen is NOT.

So CRTs dont do damage to our eyes?

I am actually going to comment more on the eye issuse. Maybe our eyes cant go in and out of focus 100 times a second, however they are trying as best as they can to keep up. Maybe thats what causes eyestrain.

 

[VirtualLarry]

Originally posted by: Tabb
So CRTs dont do damage to our eyes?

I am actually going to comment more on the eye issuse. Maybe our eyes cant go in and out of focus 100 times a second, however they are trying as best as they can to keep up. Maybe thats what causes eyestrain.

That's actually a very-good point. I wonder how much research has been done in this area.
If you think about it, eye-focus is basically a continous, autonomous, analog feedback-loop.

Now, CRTs are raster-scanned, there is no real "image" at any precise moment, only a single dot moving so very quickly across the screen, that at least physiologically, it would be impossible for an eye to accurately track. But I'm sure that at some subconcious, autonomous level, it probably tries. The nerve impulses probably get sent by the brain and eyes to the eye-muscles. But the fact that the system is analog, tends to "smooth out" those high-freq control signals. (hypothetically speaking here) But they still cause a strain on the system.

The whole reason that the CRT display "works" for humans, is because of persistance-of-vision effects, and the fact that it basically "overloads" our visual-perception circuits.

If our "eye circuits" were much faster-acting, then we would see what is really there, which is only a high-speed moving dot. Much the same, if you took a photograph with sensitive high-speed film.

So I think that necesarily, there is going to be some "strain" on the visual perception circuitry there, whether it be physical (muscular/mechnical), or neuro-checmical/electrical.

I hope it's obvious how higher refresh rates for CRTs attenuate the "stress" effects on the human visual system slightly, but necessarily, they can never eliminate them, unless we move to a different, continuous-display technology such as "liquid paper displays".