Eyes are the first of the five senses and the main visual function. Vision plays an extremely important role in people's understanding of the objective world. Usually 90% of the information obtained from the outside world is done by eyes. It is also an expression organ, a display of people's inner world, which can fully reflect people's inner activities such as joy, anger, hope and joy, so it is called the window of the soul. It is the most exposed and striking organ in human appearance, the center of beauty, and is called the window of beauty by aestheticians, so a pair of beautiful and perfect eyes often play a icing on the cake in human beauty.

From an aesthetic point of view, the size of the eyes and the size of the face depend on a certain proportion. If the width of the face is 10CM, then the ratio of eyes is 2 ~ 2.5, the length of eyes is 3 cm, and the width is 1 cm. The distance between the eyes is equivalent to the length of the eyes, which is the most ideal eye.