This study aims to establish a correlation between coating stress and LIDT. For this purpose, a coating is deposited by means of a conventional coating process with different degrees of ion assistance, which leads to varying deformations of the surface. Subsequently, the optics are bent by applying an external force in the tensile and compressive direction and examined for their LIDT. This procedure allows the investigation of the relation between stress and the LIDT for different coating parameters and processes.