There is no one-to-one relationship between myopia and the visual acuity measured by the international standard logarithmic visual acuity chart, and myopia is also mostly accompanied by astigmatism, and the size of astigmatism has a great impact on the measurement of the visual acuity chart, roughly speaking, in the absence of other eye diseases and astigmatism factors generally 200 degrees can be seen 0.3 or about 4.5. There are many kinds of vision tables, but the one commonly used by hospitals and the general public is the international standard logarithmic vision table, which is commonly composed of 14 rows of letters “E” of different sizes and openings in different directions, and the measured values are recorded as decimals 0.1-1.5 and marked on the left side of the table. 5 points are recorded as 4.0-5.2 are marked on the right side of the chart. Some scales can be more accurate to 2.0 (or 5.3). Visual acuity as measured by the International Standard Logarithmic Visual Acuity Scale is influenced by the subjective and objective factors of the person being examined, and is therefore only a crude measure of visual acuity. Factors that may interfere include the adjustment state of the examined eye, the lighting conditions of the examination environment, the professionalism of the examiner and the psychological factors of the examined eye may also interfere with the examination results. In general, every 25 degree increase in myopia may cause blurred vision in one line or so. However, many myopia is accompanied by astigmatism, and astigmatism also has a great impact on the results of the vision chart. Therefore, roughly speaking, excluding the interference factors of the examination methods mentioned earlier, other eye diseases and astigmatism factors, 200 degrees is about 8 lines of vision, which is about the vision scale corresponding to 0.3. In summary, 200 degrees of myopia can probably see about 0.3 of the international logarithmic visual acuity scale, but the degree of myopia should not be judged based on the rough visual acuity correspondence of the visual acuity scale.