Myopia is characterized by clear vision up close but blurry vision at a distance, primarily caused by changes in the eye's axial length. Several factors contribute to the development of myopia: first, hereditary factors; second, inappropriate use of eyes, such as prolonged usage leading to eye fatigue, which can worsen the degree of myopia. Typically, the development of myopia occurs under the age of 20. After 20, there shouldn't be further development; if there is, it is referred to as pathological myopia. Therefore, it is important for patients with myopia or eye fatigue to use their eyes correctly, reduce close-up activities to avoid eye strain, and have regular check-ups to monitor their vision.