Top of screen at eye level? I’m not sure this scales well with large monitors.
It is ideal so your eyes can just look straight ahead or down, and doesn’t involve head/neck movement. Mostly this is to show people that a laptop screen down on a desk is too much downward neck strain. And most people have their monitor too low. Those giant monitors do pose a problem because height off of desk may put top of monitor too high. Tilting head up to view a screen becomes neck strain. Probably best to size monitors to the task, and not jump right to a huge 4k, that you then need to scale up all the fonts to be able to read anything.
That doesn’t make sense. First you say to look down then say looking down is too much strain. I think it would make more sense to position the center of your monitor at eye level so you don’t need to always look down or always up. Plus the content is viewed in the center of the screen, not at the top.
Looing down with eyes is a natural movement when head is straight, but looking down far with neck tilted (for a low laptop screen) is neck strain. So ergonomics suggest straight ahead vision at top of monitor so heads stays directly above spine. Having vision at center of monitor causes upward glancing or backward neck tilt. you can test yourself. stare straight ahead and lower your gaze, it is easy. Now stare straight ahead and lookup, you will feel musxlcles in your eyes and forehead adjust. with high monitors people tend to tilt head back instead. if you really want to test you can get a head strap and weight system from your kinesthesiologist. when your neck and head is vertical you don’t feel the 2lbs of added weight, when you tilt your neck down or back the leverage is instantly felt as it exaggerates the effort to hold your head in place. I was a CADadmin ergo person before, so I have done all these computer peripheral trials, especially for eliminating RSI
Personally, years ago when I was coding I would get neck strain from having the monitor below my eye level because I found my head movement always followed my eyes. So when my eyes were always looking slightly down, I would always start to tilt my head down to compensate. It wasn’t until I raised my monitor much higher that my headaches went away. Even now when I hold my phone, I naturally hold it to the middle of my eye level, not below.
Yeah, guidlines be guidelines. What also makes a difference is screen angle. as we like to position our head tilt to match equal distance to screen corners. phones gives everone bad posture unless you at least hold top of phone parallel to eye level. But then you get tired arms.
Random other info:
- a headrest is unnecessary for the purposes of sitting correctly in an office chair. Headrests tend to put your cervical spine into slight extension if you’re sitting straight up.
- one thing you can’t see from this angle is your shoulder abduction angle. Most office chairs are quite wide, so trying to use the armrests while you type can put an unnecessary amount of strain on your wrists. Ideal positioning for your elbows is directly below your shoulders, like where they would rest if you were standing up. Better for your shoulders and wrists.
- if you’re looking for a good ergo chair, I always recommend a used/refurbished higher end chair rather than a cheaper new chair. The higher end chairs (Steelcase, Humanscale, Herman Miller, Autonomous, etc) typically have replaceable parts and sometimes will still have a manufacturer’s warranty depending on where you buy it.
I’m a kinesiologist who has done a lot of office ergo work.
“sitting passively with a stacked spine is really bad over long periods” – my physio
“You should sit straight up for your 996 job” – these infographics with all the validity of a food pyramid.