Test method: 1. Put on your favorite glasses and test them directly. 2, test, please and the computer screen to maintain a distance of about 30 ~ 40 centimeters, if you see the chart in red than green clear more, that you are now wearing glasses, the degree may not be enough, or you are now the degree increased! 3. If you see more green than red in the picture, it means that the prescription of the glasses you are wearing now may be too high or your current prescription is shallow!