Using the concept of visual acuity chart combined with barcode, the larger the barcode, the more serious it is, and the larger and more blurred it means that we all know this country, but because it is blurred, we don’t understand that the situation in this country is so dangerous, and the smaller it is, the clearer it is. It means maintaining the standard of TVPA. TVPA is divided into 3 levels, the third level is the most serious, and the first level represents the most standard. I hope that more people can know the severity of each region through the visual acuity chart.
