Aplanatic designs present great interest in the optics field since they are free from spherical aberration and linear coma at
the axial direction. Nevertheless nowadays it cannot be found on literature any thin aplanatic design based on a lens. This
work presents the first aplanatic thin lens (in this case a dome-shaped faceted TIR lens performing light collimation),
designed for LED illumination applications. This device, due to its TIR structure (defined as an anomalous
microstructure as we will see) presents good color-mixing properties. We will show this by means of raytrace
simulations, as well as high optical efficiency.