Ambient lighting ~= screen brightness, whether light or dark
Dark ambience = dilated pupil = 0.5 diopter decrease in lens focus
Tear film over eyes helps focus: blink, yawn, monitor dehydration & humidity
Best light: unfiltered daylight, e.g. window behind computer screen
Artificial: high CRI LED, low flicker, low blue (e.g. 2700K Sylvane Truwave)
For closeup glasses, fixed lens focal length at lens-screen distance
20-20-20: look out window, or 20+ foot distant object for 20s every 20m
Daily exposure to natural light, with distance focusing for eye muscles
Instead of a low-effort comment implying that a high-effort summary with zero rebuttals has been conjured out of nothing, please ask any question, about any sentence, for which you cannot find a source on the first page of Algolia/Google after entering the sentence as a query. They have been discussed many times here on HN and there are excellent references in those earlier threads. Alternately, ask the nearest optician or ophthalmologist.
Perhaps you've read too much into my reply. I'm capable of looking things up in my own time - thank you for your offer to help me, though - I was wondering whether you were summarizing a single source. You made it clear that you were not.
I thought I thanked you and moved on, but it seems I've pissed you off. Sorry, guess the curt and literal HackerNewsSpeak is rubbing off on me.
Thanks for the clarification. I wrote the summary because I've not seen those topics covered in a single article. To salvage this sub-thread, here is some related content :)
2018 discussion of computers and eye health, including one point forgotten above—move the screen as far away as practical, to reduce eye stress from extended periods of closeup focus, https://hackertimes.com/item?id=16146106
