The purpose with this report is twofold: 1) To report on generel methodology for evaluation of head mounted displays, and 2) To evaluate the usability of a head mounted RSD, (retinal scanning display). The RSD projects an image on the retina using a low-effect laser. The evaluated equipment in this study is monochrome and generates images only in the red part of the visible spectrum. The display is placed on the operator´s forehead with an image generator over one of the operator´s eyes. The image is projected through a transparent prism onto the operator´s retina. Questions for the RSD-evaluation have been symbols usability, minimal size for presented symbols, and usage under different lightconditions. These questions are fundamental in order to form an opinion of the operative usage of the equipment. The study indicates that RSD is a possible technique to continue to study for operative performance but the equipment has to be miniaturized.