Reading in bed is really bad for eye health. First of all, if the eyes are likened to a camera, then, as we all know, the human eye is like a camera which has the function of auto-focus. When we see the close things, such as reading a book, and the eyes need to go through a series of adjustment, so as you can see things clearly. Felling down to sleep after reading the book, it looks like that eye get the rest, but in fact, because of continuous nearly watching without rest, the ciliary muscle, the lens and the pupil need to keep sustained contraction, so in this case, it is very easy to form a spasm. Repeated long-term spasm may even lead to pseudomyopia, and cause the further development of the anteroposterior diameter of the eyeball and result in the formation of a true myopia.
