测试眼力，随着测试星级提高，色差会越来越小，色块会越来越小，并且兼顾了各种颜色，对帮助认识自己识色盲区有帮助(Test eyesight, with the improvement of test star level, the color difference will be smaller and smaller, and the color block will be smaller and smaller, and give consideration to all kinds of colors. It will help to understand our own color blind area.)