Aspherical lenses have different radii of curvature from the center of the surface to the edge, so aspheric lenses can eliminate spherical aberration and other errors that cannot be eliminated by spherical lenses, improve the accuracy of light collection, and improve the imaging quality of the entire optical system. Aspheric Lenses can be used to replace multi-lens systems, reducing weight, volume, and cost. It is mainly used in night imaging, instrument flaw detection, infrared thermal imager, infrared temperature measurement, infrared distance measurement and other fields.