Night blindness is a very common symptom of ophthalmology, which generally manifests itself as poor vision at night. The causes of this condition are mainly seen in three diseases: first, corneal softening caused by vitamin A deficiency, which is mainly due to a lack of vitamin A during the growth and development period, and therefore leads to this disease. The treatment of this disease is mainly based on vitamin A supplementation. Second, it is seen in retinitis pigmentosa, a congenital genetic disease. The earliest symptoms of this disease are mainly night blindness, and later the symptoms will become more and more severe, leading to vision loss, visual field loss, and blindness. Third, it is mainly seen in high myopia, especially super high myopia, such as more than 1000 degrees of myopia, this condition will appear poor night vision, mainly due to retinopathy caused by.