Practical common-path heterodyne surface profiling interferometer with automatic focusing

An objective definition of the protective area of laser eye protectors is discussed. First an appropriate test method is described, which is based on the current eye protection standard EN 168. For a variety of already CE type approved laser eye protectors, i.e. for different goggle and spectacle types, results of corresponding measurements are shown. From these results the requirements on the vertical and horizontal angle ranges are derived, which have to be covered by laser eye protectors. This proposal will be implemented in the currently processed amendments of the laser safety standards EN 207 and EN 208.