The optical absorption behavior of electrochromic materials can be specifically altered by electrochemical oxidation or reduction of the EC thin film material. Dimmable window panes, for example, represent a technically intriguing area of application for complementary EC layers. These materials can also be utilized in optical imaging systems, and in recent years, microirides based on various EC materials have been realized (Fig. 1). Given the EC cell's layer thickness of 50-100 µm, its application is particularly suited for scenarios where space is at a premium, such as in endoscopes [1]. Additionally, an EC device with a radial electrode arrangement, utilized as gradient filters, has been implemented in camera systems (Fig. 2). These devices enable the specific darkening of regions in images that are excessively bright during image acquisition [2, 3]. Notably, the use of spectrally complementary EC materials on the two electrode surfaces allows for the realization of an optical gray filter [1, 4].To regulate all these systems, a complex model of the spectroelectrochemical behavior of such complex EC systems was developed and established [2, 3]. This model was further utilized to implement an actively controllable Fourier filter with the aforementioned EC materials [5].