In this paper a new method to evaluate gated viewing systems and range-gated imaging sequences, using a Lissajous-type eye pattern, is presented. This approach enables the comparison of gated viewing systems and defines clear criteria for depth resolution and depth mapping capabilities of an active imaging system. A distinct parameter can be depicted and sensed within a single chart. Therefore, this approach is a first proposal for an evaluation procedure of gated viewing systems and an enhanced analysis tool in the means of 3D capabilities.