[Off-topic] DanillaTech:
Helllo! I am Russian, my English is not very good, but I have not success with my idea in my country (nobody cares about health).

I want to talk about absolutely another way for health caring, if you compare this with traditional design and usability.

Now we have a LOT of people with glasses. People take their first glasses in childhood, and most of them using tablet or PC very often, and this is really bad. Also, we can see something like this (it's not me :) , and it's very bad to.

Why his back is a curve? It's not only "bad habbit" of one man, it's a problem of many people . I think that the reason of bad back and glasses is very simple and stupid - he (we) physically can not see text well, and glasses or curve back it's a trying for compensation!

So, if we want to have health people, developers should rebuild old methods of text displaying, because they are not compatible with our health!

Most of Russian spend a lot of time for sitting in our social network. VK.COM . If we talk about PC (not mobile phone or tablet), it uses 11px font by default! It's not only very small font, it's very low detailed font, especially, if we remember, that "program" DPI is 96 (in paper this is 300). Really display DPI in windows does not matter - font drawing in 3 times less.

I want to say we should use 16px/12pt font size by default, and stop use small font size. It's something like this (if we say about detalization)

Why 16 px? Firstly, it is compatible with 12 pt (12pt*96dpi/72=16px). So, we can use 16px not only in web, but also in Window interface. Secondly, I want to say that "bigger is better", but 18px (for example) in most of font look absolutely different (bolder) with 12-17px, it is unusual for some people.

Also, I want to say about features of human text perception. Long line length (more 100 symbols) is not good for us, and text understanding becomes worse. If we read books, line length physically can not be very long, but in the Internet a lot of text (for example, Wikipedia) do not consider this. Bigger font size can reduce line length, but developers should to consider it.

I mean, that most of children hate reading, because this associated with big eyes's strain (small font-size), curve back and inability to get text well (loong line-length).

Also, some rules are existed - if we use bigger font and shorter line-length, we should reduce line-height. Default line-height is 150%, I think we need to reduce it to 136%.

So, these principles can be simple realized in CSS:

*{font-size:16px;

line-height:136%}

I called it ESI - eyes saving interface, and it have realization in plugin, which load custom CSS for sites. There is not only font-size and line-height, it includes rebuild site rebuilding. I does not make it good, but something like this:

It's usual VK

It's ESIed VK

It can looks unusual and bad, if compare it with traditional representation of design, but I believe it's better for health.

ESI is better, than scaling, because we don't lost information, and ideally we can control base FONT-size.

It's YouTube

It's ESI YouTube.

Ideally, user need to have an opportunity for manual tuning of base text parameters.

It's wikipedia's control (prototype). You can choose font-size, line-height, max-width, and you can change font-family (for big texts it's preferred use serif, but apply it for every element it's too global)

Also, ESI realized to Windows in themes, you can download it and try. You can apply it correct to the Windows 7 (maybe Vista) only, because Windows 8 has independent font setting.

But Windows have some "bug" - you can set 12pt for icon's text, but horizontal spaces are not in theme. It means, that icon's names will look like

«Wind...» int 12 pt, not «Windows» in 8(9?)pt. In Windows 7 you canenlarge horizontal spaces to 85 (I prefer numbers that are divisible by 17) or something, but in Windows 8 you can not control it, maybe in registry.

So... I think that ESI idea should have some support. Suppose I can rebuild every program and site for comfortable of my eyes, but it's quite hard and eats my time. I'll still see people with poor eyesight and curve back, who hate reading, and I believe, that some developers can affect on it.

Now, you can test ESI with my plugin (it's Stylish with little mod) and give your opinion. You can install it using google chrome bit.ly/esi_c or bit.ly/esi_o for opera. Then you can find esi styles for some sites, Facebook (I did not work on it), Wikipedia, YouTube...

I can not post external link for images...