Modern spectacle frames are part of fashion, not just medical instruments. Wearing glasses, the spectacles do not want to expose their faults, but hope that the frame can play a decorative role, conceal the shortcomings, and highlight the advantages.
According to the geometric shape determined by the main skeleton structure of the face, the face shape can be divided into 6 categories: square, rectangular, round, inverted heart and oval. The above classification is not absolute, the specific face shape may be different from each of the above, but it is very helpful for analyzing the face shape, choosing the right frame, highlighting the advantages, concealing the shortcomings, and giving people a sense of symmetry and balance. For example, a square face shape wearing a round frame can eliminate the feeling of over-obvious edges and corners, and the same square frame will add a round face with a sense of edges and corners.
In some other places, there are similar phenomena. For example, a person with a full body will look slim when wearing vertical clothes, while wearing horizontal clothes will be fatter. People with round faces also tend to have straighter hairstyles, which increase the sense of contour, and rarely perm and curl their hair.
A basic principle for the selection of the frame is that the width of the frame is basically the same as the width of the temporal side. If the frame is too wide, it will be too cumbersome and will increase the aberration of the lens.