The standard for normal vision is a vision of 5.2 in an unimpaired condition, but a vision of 5.0 is generally considered normal in clinical practice. A vision of 4.8 in the left eye and 4.9 in the right eye indicates a mild loss of vision, and if it is a simple refractive error, the myopia is usually within 150 degrees. However, it should be noted that it is impossible to determine the number of degrees needed to correct vision by relying only on the value of naked eye vision, which should be confirmed after a professional optometry test. The first thing you need to do is to take a look at the table. pseudomyopia. Generally, you can restore vision by improving your habits, such as avoiding playing with cell phones and watching TV for a long time, in order to prevent the development of true myopia; 3, true myopia: that is, refractive error. If refractive error causes vision loss, you should also consider whether there is astigmatism and other conditions, and if there is astigmatism, the degree of astigmatism should be judged after the optometry; 4, eye diseases: if the vision loss is caused by intraocular diseases Such as cataract, glaucoma and other diseases, these diseases lead to progressive decline in eye vision, it is impossible to use lens correction to achieve the purpose of restoring vision. You should seek treatment for the primary disease according to the guidance and recommendations of your ophthalmologist. In general, you should do eye exercises, avoid prolonged stimulation by bright light, pay attention to eye rest, look into the distance, do outdoor activities or rest with closed eyes intermittently. In addition, you can take more food containing carotenoids and apply hot compresses to your eyes before going to bed to help relieve eye fatigue and slow down vision loss.