This will happen mostly if people start focusing on the quality of content rather than the economical benefit. Some people post random and copied comments over and over again but do not add any value to the post.

Indeed, I am keen on getting quality out there rather than quantity which is why if I am not ready to write and write well I do not post.

I read in my school textbooks that we cannot read if the text is nearer than 25 centimeters, but for me, this value is less.

There is something called the Near Point of Accommodation, you may want to check this out, this varies according to person and is probably one of the reasons why your near point may not be up to 25 centimeters. Also, let me add that as we grow our accommodation power reduces taking our close point from 25 centimeters even further than that. If you are 40 years and above you will probably fall within this group otherwise known as presbyopia. I would also treat this topic as the days go by.