Why do electronic display screens make my vision blurry?

In summary: It's possible that you're not used to the brightness of the screen. After a while, staring at the screen for a long time might start to cause blurred vision.
  • #1
iScience
466
5
what is intrinsically different about the light coming from electronic display screens vs the light everywhere else (light from the environment)? perhaps.. the brightness? but that shouldn't cause blurry vision. this deals with focuses.. anyone have any suggestions as to why this might be?
 
Biology news on Phys.org
  • #2
Perhaps after focusing on any object relatively close for a while could cause some people to have trouble focusing on distant objects after a while.
 
  • #3
any specific type of electronic display?

LED, LCD, Fluorescent, etc ??

Dave
 
  • #5
it's just LCD
 
  • #6
You say you have blurry vision. Can you elaborate? Are only distant objects blurry? Both near and far?
Is the display itself blurry?
 
  • #7
Some screen are very small, and you will strain your eyesight working too long trying to read the small characters and fine display features. Also, a lot of word processing and Acrobat readers use white backgrounds, which I find to be quite bright. Staring at these bright backgrounds will also introduce eye fatigue. Screen can also pick up glare from your surroundings, piling on the fatigue to your eyes.
 
  • #8
There is very little that is inherently different. LCD screens contain polarisers so if you are wearing polarised sun glasses you might see strange effects but not necessarily those you describe.

Bright lighting causes the pupil to contract and may even make you squint through your eye lashes. This can create a pin hole camera effect that compensates for defects in the focusing mechanism in the eye. This is why people who wear glasses tend to peer at things through partly closed eyes when forced to read something without them.

The opposite effect happens under low light levels. The pupils dilate and this causes a reduction in the depth of focus making it harder to focus if your focal range is already limited.

I would recommend visiting an optician, explain the effect/problem to them and get your eyes tested.

I now have a pair of transitional focus glasses with the bottom designed for reading close up (eg the keyboard/books) and the top designed for reading my LCD monitor.
 
  • #9
A bad refresh rate can do it.
 
  • #10
iScience said:
what is intrinsically different about the light coming from electronic display screens vs the light everywhere else (light from the environment)? perhaps.. the brightness? but that shouldn't cause blurry vision. this deals with focuses.. anyone have any suggestions as to why this might be?

Are you dealing with eye fatigue? I need to take a 10min break every 30min I'm at the computer or my eyes will feel wreaked by the end of the day. I'm talking bloodshot, dizzy, blurry, and feeling nauseous. Try to turn down the brightness and change the hue from a cold to warm color.
 
  • #11
since this was reposted in the medical sciences section, let me ask it this way: what is it about the light coming from my laptop that's causing my iris to contract (or relax)? i live in florida and it gets super bright outside (much brighter than the light coming from my laptop), and sometimes, when i forget my sunglasses, i am exposed to my bright surroundings but i don't recall ever getting blurry vision from that. i don't know very much about the eye, but i hope I'm not being too inaccurate when i say that the iris tends to contract or relax based on voluntary feedback from the brain; ie if something is close, i will have the natural response of wanting to contract my iris muscles to get the clearer image. When i first look at my computer screen everything looks fine but after about 8~9 hours my vision becomes so blurry it takes about sometimes a couple hours for me to recover. My point/question there was that, everything looks fine in the beginning, so what about the light coming from the laptop is generating a response from my iris such that it is constantly wanting to ""focus" ie contract, even though everything is in focus just fine in the beginning?

let me know if any of my wordings were unclear
 
  • #12
I think you need to elaborate on what your exact symptoms are, like I said in post #6.

You say you have blurry vision. Can you elaborate? Are only distant objects blurry? Both near and far?
Is the display itself blurry?

It appears to be normal eye strain from staring at a nearby object for extended periods of time. Note that this isn't a result of the light itself. There's nothing different about the light coming from a monitor that would cause this. It's because you're staring at something for an extended period of time.
http://en.wikipedia.org/wiki/Computer_vision_syndrome
http://en.wikipedia.org/wiki/Asthenopia
 
  • #13
ah sorry, the more distant an object is the better i can see it. and the more time i spend on my computer, the farther the 'clear' distance becomes. ie i have trouble seeing nearer objects.and okay, thanks
 
  • #14
iScience said:
ah sorry, the more distant an object is the better i can see it. and the more time i spend on my computer, the farther the 'clear' distance becomes. ie i have trouble seeing nearer objects.and okay, thanks

Hmmm. Interesting. I hadn't heard of this before. What happens to me is that I can't see far away objects because I've been focusing on something close for a long time.
 
  • #15
iScience said:
When i first look at my computer screen everything looks fine but after about 8~9 hours my vision becomes so blurry it takes about sometimes a couple hours for me to recover.

I think someone already posted this but your description fits this perfectly...

http://vision.about.com/od/sportsvision/a/Asthenopia.htm

The issue is nothing to do with the light source. It's mostly to do with your eyes focusing on something at a constant distance. So in your break time don't go reading a book or playing with your phone as these will be roughly the same distance away from your eyes as the LCD screen.
 
Last edited:
  • Like
Likes 1 person

1. Why do electronic display screens make my vision blurry?

Electronic display screens emit blue light, which can cause eye strain and fatigue. This blue light scatters more easily than other wavelengths, making it harder for our eyes to focus and resulting in blurry vision.

2. Does the distance from the screen affect blurriness?

Yes, the closer you are to the screen, the more strain it puts on your eyes and the more likely you are to experience blurry vision. It is recommended to sit at least an arm's length away from the screen to reduce eye strain.

3. Can the brightness or contrast of the screen impact blurriness?

Yes, the brightness and contrast settings can affect how your eyes perceive the screen. If the screen is too bright, it can cause glare and make it harder for your eyes to focus, resulting in blurry vision. Adjusting the brightness and contrast to a comfortable level can help reduce the blurriness.

4. Are there any other factors that can contribute to blurry vision from electronic screens?

Yes, the refresh rate of the screen can also play a role in blurry vision. A low refresh rate can cause flickering, which can strain the eyes and lead to blurry vision. Additionally, not taking breaks and staring at the screen for extended periods of time can also contribute to blurry vision.

5. Is there a way to reduce the blurriness caused by electronic screens?

Yes, there are several ways to reduce the blurriness. One is to adjust the display settings, such as brightness and contrast, to a comfortable level. Another is to follow the 20-20-20 rule, where every 20 minutes, take a 20-second break and look at something 20 feet away. This can help reduce eye strain and prevent blurry vision. Additionally, using blue light filters or wearing glasses specifically designed for computer use can also help reduce the blurriness caused by electronic screens.

Similar threads

Replies
69
Views
4K
Replies
62
Views
3K
  • Introductory Physics Homework Help
Replies
7
Views
5K
  • Astronomy and Astrophysics
Replies
25
Views
1K
Replies
10
Views
18K
  • Other Physics Topics
Replies
1
Views
2K
  • High Energy, Nuclear, Particle Physics
Replies
2
Views
946
Replies
10
Views
940
  • Biology and Medical
Replies
4
Views
3K
Back
Top