This guide was written for lighting designers and engineers, as well as scientists of light, colour, and vision to assist them in taking account of the needs of older persons and persons with disabilities. The guide was developed in accordance with ISO/IEC Guide 71:2001 "Guidelines for standard developers to address the needs of older persons and persons with disabilities" and its technical guidelines ISO/TR 22411:2008 "Ergonomics data and guidelines for the application of ISO/IEC Guide 71 to products and services to address the needs of older persons and persons with disabilities" in order to implement accessible design in the field of light and lighting. Some content has been shared with those two documents. The guide was prepared by a Working Group (Ad-hoc) in the CIE Board of Administration in cooperation with TC 1-54 "Age-related change of visual response" and TC 3-44 "Lighting for the elderly".