The corner of the eye refers to the corner outside the eye. The corner of the eye plays an important role in people's facial expressions, which can convey a lot of information. When people are happy or satisfied, the corners of their eyes will rise slightly; When people are angry or dissatisfied, their eyes will droop or wrinkle; When people are surprised or confused, their eyes may be slightly pulled. Therefore, the corner of the eye is often used to judge people's mood and emotional state.

The corner of the eye also has the function of beauty. Some people look dull and dull because the corners of their eyes are not raised enough, but eye plastic surgery can make the corners of their eyes rise and make their eyes look brighter and more energetic. Some women also like to use makeup to create the beauty of the corner of their eyes, such as using repair powder to highlight the outline of the corner of their eyes and using eyeliner to deepen the outline of the corner of their eyes. Therefore, the corner of the eye has become an important part in the field of beauty and makeup.

In addition to the above functions, the corner of the eye also plays an important role in vision protection. People's eyes often start from the corner of their eyes, which is also one of the key points of vision protection for eyes. Therefore, long-term use of computers, mobile phones, tablets or reading books and other activities that require eyes will exert certain pressure on the corners of the eyes. Proper eye exercises can relieve the fatigue of canthus and protect eyesight. Therefore, the corner of the eye is not only a part of beauty and emotional expression, but also closely related to people's vision protection.