Comment by marvindanig | Hacker News Reader

Comment by marvindanig | Hacker News Reader

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Absolutely! Ha, yes!

Scrolling vertically is orthogonal to the reading direction. This makes us lose track of scanning head (leading word/sentence) on the content easily. Goes against the grain of our saccadic perception kinda of.

A horizontal flipping transition however, with line-tracking over the text (orphan/widow handling) is the most comfortable book reading experience since it is only intermittently animating—when moving forward to the next page, and connects with the forward flow of storytelling along a groove that our eyes can keep track of.

IMO, page flipping is THE native control of a book and it cannot be dropped off the standards just like that!

I recently read a paper on why an iridescent screen of an iPad or a smartphone is better for the human eyes than a reflective surface of electronic paper like E-ink.

Flux of light.

Intensity or flux is the only parameter that matters to the health of our eyes, and that’s something one could control only with an IPS panel type of screen. Since an e-ink relies on ambient lighting fwiw, low illumination can easily strain the reader’s pupillary muscles and degrade sight sooner.

E-ink (especially with additional functional layers which typically overlay the e-ink itself) are pretty dark.

I find ink-on-paper to be difficult to read under direct sunlight as it is too dark. E-ink is virtually perfect contrast under such conditions.

With a "frontlight" layer, my Onyx BOOX is highly readable, though my preference is to have a bright light or reading light reflecting off of it, with the frontlight also enabled. In bright sunlight the additional light isn't necessary. In dim-lighting conditions, the light leakage through the inked-in portions is distracting.

One consequence is that "dark mode" formats are not well suited to e-ink, though they do remain generally readable. The fact that artefacts are more visible against a dark background may contribute to this.

I remember research and/or statements long ago (1980s) that brown ink on a slightly off-white paper has the highest readability, and know of several authors who had their books set like this. In general it's a good option.

For onscreen emissive displays, the variability between displays and ambient lighting conditions generally makes it a poor option, though for desktop use I'll often prefer a slight off-white background and very slightly muted text colour preferable. (Example of my typical CSS preferences: https://codepen.io/dredmorbius/full/KpMqqB)

> I recently read a paper on why an iridescent screen of an iPad or a smartphone is better for the human eyes than a reflective surface of electronic paper like E-ink.

Doesn't sound intuitive at all. How did they measure "better"? The natural environment is all reflective. Butterfly wings are reflective. Fruit colors are reflective. Human eyes evolved for the natural environment. Very very few natural things generate emmissive visible light. My eyes get exhausted reading on an LCD. I don't get that same feeling when reading on actual printed paper or on E Ink.

It is counter-intuitive indeed! This research led professors Jeffrey C. Hall, Michael Rosbash and Michael W. Young to win the Nobel Prize [1] in Physiology and Medicine in 2017.

The cue is in the effort required to capture the message from a body of text. Reading has two broad stages–putting our eyes to feed the optical data and then our visual acuity in the brain (vision) to process that data--recognizing glyphs, putting together words, sentences etc.

If we concentrated on a butterfly or a fruit for hours on the end similarly, in a poorly illuminated environment, it is going to affect our eyes. The pupillary muscles have to remain contracted to let enough light in. A glow-worm on the other hand would feel more exciting and comfortable to watch in a dimly lit situation.

But that's only stage one. The stage two is where the magic happens. And it has a catch!

The morning/daytime spectrum from an LCD panel makes it easier for the eyes to capture the text because the illumination is great, but it also forces us operate attentively. By being attentive, our brain is pushed to operate at a higher energy level. It then uses more energy to process the load of incoming information and this whole deal exhausts us by the end of day.

Sometimes when we don't look at the evening shift spectrum of a sunset (reddish shift), our body clock does not trigger a restful mode. A fatigue sets in, if you will.

But this only means that it is time to take rest and not read anymore. Cue an IPS screen is still healthier for the eyes than a reflective e-ink one when it comes to long-haul reading.

[1] https://www.nobelprize.org/prizes/medicine/2017/press-releas...

Edit: Sorry wrote this one in a hurry. Have to go away from the computer now!

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