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Originally Posted by Quoth
You are posting personal opinion and nonsense (300ppi black on its own is nonsense).
Medically there is zero difference between reflected LED light from a CFA & eink and through LED light via CFA & LCD at the same brightness. That is a fact. Ask any qualified eye specialist.
A 45 cm distance suggests reading glasses are needed, or wrong prescription. Contact an eye specialist, or get a new one!
Coloured headings are unimportant and will be faded on Kaleido, i.e. have lower contrast. If colour is important, other than a comic, then a matt LCD/OLED properly adjusted is less eyestrain and easier to read.
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If you are an ophthalmologist, please put your appropriation back.
Your statement is medically proven to be wrong.
Look
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Durchschnittlicher Leseabstand im Nahbereich
Fasst man die Aussagen von Augenoptikern zusammen, dürfte der Richtwert für einen »normalen« Leseabstand in Deutschland bei Normalsichtigen bzw. bei korrigierter Kurzsichtigkeit (Myopie), Weitsichtigkeit (Hyperopie) oder Altersweitsichtigkeit (Presbyopie), bei etwa durchschnittlich (∅) 40 cm liegen.
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not less than 25 cm!
A 300 ppi dot=0 with a 300 ppi red filter still produces red=0 (300 ppi black); the same goes for green and blue - that's what you learn in physics; if!
I don't even want to go into any more nonsense.