This part of ISO 9241 provides ergonomic requirements for stereoscopic displays using glasses. These requirements are stated as performance specifications, aimed at ensuring effective and comfortable viewing conditions for users, and at reducing visual fatigue caused by stereoscopic images on stereoscopic display using glasses. Test methods and metrology, yielding conformance measurements and criteria, are provided for design evaluation. This part of ISO 9241 is applicable to temporally or spatially interlaced type. These are implemented by flatpanel displays, projection displays, etc. Stereoscopic displays using glasses can be applied to many contexts of use. However, this part focuses on business and home leisure applications (i.e., observing moving images, games, and so on). Only dark environments are specified in the current version of this part.