What kind of glasses are correct?

A pair of spectacle frames is composed of multiple parts, including the rim that holds the lenses, the bridge of the nose that connects the two rims, the nose pads that support the nose, the temples that hook the ears, and the temples that connect the temples to the glasses. The pile heads and hinges of the circle.

Only if these structures are in normal condition can the glasses not be crooked. For example, the front angles on both sides of the glasses should be consistent, the opening angles of the temples should be symmetrical, and the temples should not be tilted when placed flat or upside down, etc.