There are many causes of myopia. On the one hand, it is considered to be related to genetic factors, and on the other hand, it can be considered to be greatly related to external factors. 1. Genetic factors: Myopia can be inherited in various ways, including autosomal dominant inheritance, autosomal recessive inheritance, and concomitant X dominant inheritance. 2. External factors: due to close reading or prolonged reading of cell phones, computers and other electronic products, resulting in visual fatigue, patients are prone to myopia. Myopia can lead to vision loss, and patients with high myopia can also develop myopic fundus lesions, such as retinal degeneration and retinal tears. It is recommended that patients with myopia consult a doctor in a timely manner to assess their condition and follow the doctor’s instructions for treatment.