Small screens emit less light and consequently less of the blue light that tends to disrupt a proper sleep cycle than large screens do.
Yes, the smaller size of the tablet is cancelled out by the fact that people tend to hold it closer to the eye with the result that just as much of the light coming directly from the screen enters the eye, but in the case of the larger screen viewed further away, there is much more indirect light (e.g., light that has bounced off the walls of the room) entering the eye.
(As the amount of light entering the eye increases, the pupils constrict in compensation, but at the intensities used for reading at night, the compensation is only partial if my experience and careful observation of myself is any indication.)
Also, many on this site are nearsightedness (because nearsightedness is correlated with intelligence). Nearsightedness would be my guess as to the cause of his/her belief that “Tablets’ screens are also much better for reading than PC monitors”.
Small screens emit less light and consequently less of the blue light that tends to disrupt a proper sleep cycle than large screens do.
Yes, the smaller size of the tablet is cancelled out by the fact that people tend to hold it closer to the eye with the result that just as much of the light coming directly from the screen enters the eye, but in the case of the larger screen viewed further away, there is much more indirect light (e.g., light that has bounced off the walls of the room) entering the eye.
(As the amount of light entering the eye increases, the pupils constrict in compensation, but at the intensities used for reading at night, the compensation is only partial if my experience and careful observation of myself is any indication.)
Also, many on this site are nearsightedness (because nearsightedness is correlated with intelligence). Nearsightedness would be my guess as to the cause of his/her belief that “Tablets’ screens are also much better for reading than PC monitors”.