Abstract: An optical device and use thereof are provided. The optical device includes: at least one lens element, a lens barrel and at least one heating element, wherein the lens barrel has an installation cavity, the lens element is installed in the installation cavity, and the heating element is arranged to contact a surface of the lens element near an object side in a manner capable of being powered-on to generate heat; or, the heating element has at least two terminals, and at least two conductive elements are fixed at positions in contact and electrical connection with the corresponding terminals, respectively. According to the above technical solution, the heating element can generate heat, to heat the lens element so as to accelerate the dissipation of moisture attached to the surface, has an active defogging and defrosting function, and can prevent against fogging or frosting.