The acquired deflectometry pattern images. (left) The yellow boundary indicated the 3D printed mockups MODE segments. The attached slide glass provides a strong return signal representing the actual MODE lens surface case. The upper segment is mounted on a motorized KEYS support and the lower one is mounted on a manual adjustment support. (middle) The KEYS system was used to align the segments and saved the raw fringe image as a reference. (right) An intentional perturbation was applied to the upper segment and the misaligned was clearly detected by the shift of the pattern, which is processed by the deflectometry phase calculation [7].