1. There is no obvious bone dislocation or deformity after nasal bone fracture, and the shape and function of the nose are basically normal, which is a first-class disability.
2. There is slight dislocation or deformity of the bone after nasal bone fracture, but it will not cause obvious nasal appearance deformation to be secondary disability.
3. The fracture of the nasal bone leads to obvious dislocation or deformity of the bones, which leads to obvious deformation of the nose into a third-grade disability.
4. After the nasal bone fracture, the bone dislocation or deformity is so serious that it cannot be repaired by non-surgical methods, which is a four-level disability.