Originally Posted by KYKYLLIKA
Omg. I just read this arm’s length thing and decided to check up, because I always end up leaning forward a bit. Guess what. When I do lean in, it’s exactly my arm’s length.
I would speculate that one aspect of that suggestion is that for a while most screens become "retina" at approx arms length with their approx 75 to 100 ppi pixel density (120 cm to 90 cm "retina" distance with 20/20 vision). In addition to the ergonomic considerations. For comparison, modern high denity screens, say, the popular 28'' 4K become retina at ~55 cm distance. I.e., at about that distance you are in theory capable of making use of all the pixels for useful information with 20/20 vision.
In my personal experience the difference between daily usage distance of ~30..40 cm and ~60 cm is huge from the standpoint of eye strain.
That is my current setup. Bottom middle is the 28'' 4K and on it's sides DELL 23'' 1080p screens. The on the top is the ipad 3 replacement screens array. The top screens I'm using atm for auxiliary information, say throwing in there a pdf or a graph which I don't need to study closely (that I do on my primary screen) but want to take an occasional glance at while writing stuff. My distance from thew primary screen is about 60.. 80 cm most of the time depending on how i'm sitting and what I'm doing. Windows 7, 125% dpi scaling.