The length scale of the elementary processes of plastic relaxation of glassy materials is still an open question. The computer simulation of plastic deformation gives the details of the plastic shear events. To study the localization of these events, a novel approach based on Delaunay Tessellation and Fast Fourier Transforms techniques is invented. Using this novel approach we have studied the localization of relative atomic strain in discrete shear events during plastic deformation of glassy materials. The strain in such shear events is highly localized in regions of atomic dimensions. The implications of the novel approach and our simulation results for a universal theory of plasticity of glassy materials will be discussed.