Often using P4 to read novels may cause eye fatigue, blurred vision, eye pain, and other problems. These problems may be one of the symptoms of shortsightedness. Nearsightedness is a common visual problem that can cause distant objects to become blurred or even completely invisible. The occurrence of nearsightedness is related to genetics, the refraction of the eye, the shape of the corneas, and other factors. In order to prevent the occurrence of nearsightedness, it is recommended to maintain good living habits, including regular rest, reasonable diet, and reduce long-term close eye use. At the same time, you can consider wearing vision correction tools such as glasses or contact lenses, or self-management methods such as vision training and eye exercises.