Patients with night blindness cannot improve their symptoms by fitting glasses. Fitting glasses is mainly used to correct refractive errors, such as myopia, hyperopia, astigmatism, etc., whereas night blindness is not caused by refractive errors. It is usually caused by the following reasons: First, it may be caused by retinal pigment degeneration, for which there is currently no effective treatment. Avoiding strong light stimulation can help delay the progression of the disease. Second, it may be caused by late-stage glaucoma, which requires treatment with medication or surgery to reduce eye pressure in order to stop and delay the progression of the disease. Third, it may be caused by malnutrition of the rod cells, related to genetic factors, for which there is also no effective treatment available. Fourth, it may be caused by a lack of vitamin A, which can be treated by taking vitamin A capsules orally. (Please follow medical advice when using medication.)