This American National Standard, together with ISO 15004-1 and ANSI Z80.36, specifies requirements and test methods for slit-lamp microscopes to provide slit illumination and observation under magnification of the eye and its adnexa. This American National Standard is not applicable to microscope accessories, e. g. photographic equipment and lasers. This American National Standard takes precedence over ISO 15004-1 and ANSI Z80.36, if differences exist.