Effect of Imaging Induced by Defilement on Lens

An image theory of defiled lens is established in this paper on the basis of Kirchorf theory. By discussion, it was found that light field distribution function of image plane is piled up by image of object and diffracted image of defiled area on lens. It is pointed out that the diffraction image of the defiled lens can be viewed as Fraunhofer diffraction when the object distance is almost infinite, and it can be obtained by Fourier transformation.