Too white paper will increase the color contrast, and the second is that the reflected light is too strong, which will excessively stimulate the visual nerve and easily cause visual fatigue. If the paper looks dazzling, or you feel tired after reading less than 10 minutes, the paper color is definitely not suitable. Good children's books should be soft, close to natural colors, and not too reflective. The more severe the reflex, the stronger the stimulation to the eyes, and the ciliary muscles of the eyes are in a state of excessive contraction, and the eyes are particularly prone to fatigue. After a long time, it will form functional myopia. Children are used to seeing colors that are too heavy and too bright, and their discrimination against natural colors will be weakened in the future. The paper color of books on the market now changes greatly. Some bright colors, such as red and green, can arouse readers' desire to read, but they will feel tired after reading for a long time. Therefore, the color of books and papers should be soft tones, such as light yellow and light pink, which will not make eyes tired quickly when reading. Adults are willing to look at fine pictures, but the pictures in children's books should not be too fine and complicated, and the words should not be too small, otherwise the children will look very hard, and they will unconsciously open their eyes and get close to the book, which will affect their eyesight for a long time.

From a medical point of view, children's vision should be completed after 5 years old. At the age of 5, children's normal vision can reach 0.8 ~ 1.0. In the meantime, we must pay attention to protecting children's eyesight. Because children's eyes are not mature enough to see things that are too thin, it is better to have bigger words and simpler pictures. Don't have a taste, smell the book. Some book publishers add some chemicals in order to pursue the appearance and feel of books. If the materials used are not environmentally friendly, it will do harm to children's health. Generally speaking, harmful substances will have a pungent smell. You can smell it before you buy it. If they smell, don't buy the binding of reading books. The paper of paperback books should not be too hard or too thin, otherwise it is easy to cut children's hands. The corners of hardcover books should be rounded or rounded, otherwise the hard and sharp corners will easily stab children.