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Computer Vision Syndrome

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Re: Computer Vision Syndrome

#91
post #80

I feel incredibly lucky that I don't suffer from any of these symptoms, as I sit, and have sat, in front of my computer for ~14 of my available waking hours each day for the past... 10 years? 8 hours a day at work, and I then come home and game for 3 or 4 more, sometimes as much as 9 or10 additional hours, and have not yet felt anything as described here. I may do these exercises naturally, as part of my existing hab…

Give it a few more years.

Re: Computer Vision Syndrome

#92
post #5

Anyone know of a break-taking app that watches your activity and can wait until you've lost focus on your work before reminding you to take a break? Something like the alarms that wake you up at the right point in your sleep cycle. It would probably need to have a cut-off eventually, but I'd hate to be interrupted in the middle of tracing some complex logic if there's a perfect stopping point 10 minutes later.

http://www.workrave.org/

Re: Computer Vision Syndrome

#93
post #53

over the last 10 years of being on a computer for at least 10 hours a day my distance vision has been obliterated. i used to have 20/15 vision and now i have 20/50 vision. I'm positive the screens are the issue. My toddler nieces stand a foot away from tvs and every time i see it i beg their parents to not let them subject their developing eyes to that.

How do you know it was computers and not just age in general?

IIRC there is no scientific consensus that computer usage causes near or far sightedness.

Re: Computer Vision Syndrome

#94
post #5

Anyone know of a break-taking app that watches your activity and can wait until you've lost focus on your work before reminding you to take a break? Something like the alarms that wake you up at the right point in your sleep cycle. It would probably need to have a cut-off eventually, but I'd hate to be interrupted in the middle of tracing some complex logic if there's a perfect stopping point 10 minutes later.

http://www.workrave.org/

I've found workrave to be great on linux, and I highly suggest it for anyone, you can configure how the breaks are laid out in just about any fashion.

Re: Computer Vision Syndrome

#95
post #12

My retired optometrist friend recommended that I wear reading glasses with a very low power at all times while using the computer, and I do that now. They're .75x or 1x, I can't remember. I don't need them--nothing is blurry without them--but they help your lenses to relax by doing some of their work at close distances. The condition he wants me to avoid is called nearpoint stress, but sounds very similar to me (a la…

It's incredible how small is the Internet. Just today I went to my optometrist because I have problems focusing objets at a certain distance. Turns out that I had exactly the same diagnosis, and I was recommended to buy a 0.5 glasses and use them when I'm staring at the computer or tablet.

Re: Computer Vision Syndrome

#96
post #3

Surprised this article doesn't mention Bias lighting: http://www.howtogeek.com/213464/how-to-decrease-eye-fatigue-...

I'm a strong believer in bias lighting, and that it critically needs to be either incandescent or sunlight-based. Putting one flickering light source next to another (perceptible or not) causes more trouble, in my personal experience.

Re: Computer Vision Syndrome

#98

Earlier quoted context omitted.

Turning down the brightness had the opposite effect for me. My monitor at the time "turned down the brightness" by reducing the duty cycle of the backlight. This caused flickering that was imperceptible yet caused much eyestrain. Actually turning up the brightness, moving the monitor as far back as possible, and using yellow-tinted Gunnar lenses have made a huge difference for me. Edit: This is the technique used to…

Basically every monitor with a LED backlight controls brightness by PWM. It only causes problems if the frequency is too low. (Contrast with fluorescent lights: every single fluorescent tube in existance flickers, but only some flicker slowly enough that people can notice. https://www.youtube.com/watch?v=bjyhFyUN_zQ Ditto CRT monitors, back when they were still used. Refresh rate of 60hz is flickery and annoying, ref…

According to this recommendation page [0], there are quite a few monitors with "PWM-free (flicker-free) WLED backlight". The list includes many affordable mainstream choices.

I heard some monitors may revert to PWM below a certain brightness threshold, but assuming the information on that page is accurate, not getting PWM-free monitor is probably a sub-optimal purchase decision.

[0] https://pcmonitors.info/recommendations/

Re: Computer Vision Syndrome

#99
post #52

Earlier quoted context omitted.

Well no cure aside maybe not looking at a backlight. I really wish there were marketed displays without a backlight. There's got to be a way.

I've been wanting this for ages. And more simply, I want brightness controls that go all the way down to zero.

On my system, I can run this:

  # echo 100 > /sys/class/backlight/intel_backlight/brightness
This sets the backlight brightness. I'm not sure what the units are, but it can go all the way to 0. If I shine a very bright light at the screen (like sunlight), it is readable at 0.
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