Naked eye visual acuity of 0.2 is considered to be related to refractive errors, such as myopia, astigmatism, hyperopia, and may also be caused by organic lesions of the eye, congenital amblyopia, etc., which can be remedied by wearing corrective glasses, doing surgery, amblyopia training, and so on. 1. Related to refractive error: myopia, hyperopia, astigmatism, etc. are manifestations of refractive error, which is the main cause of myopia. This is the time to go to the hospital to do optometry, if it is myopia and other conditions, it is best to wear corrective glasses, so that it is possible to improve the vision. 2. Organic lesions of the eye: if the vision does not improve after wearing glasses, it is most likely due to organic lesions of the eye, such as cataract, fundus, etc., which require surgical treatment or medication. 3. Congenital amblyopia: in case of congenital amblyopia, amblyopia can exist together with high myopia and high hyperopia. If accompanied by amblyopia, glasses should be worn in time, and amblyopia training should be carried out at the same time, such as masking method, fine eye training, grating training and red filter treatment method. Patients with 0.2 naked eye vision should go to the hospital in time, after clarifying the cause of the disease, under the guidance of the physician, to take targeted treatment measures, so as not to cause aggravation of the condition.