Ergonomics of human-system interaction - Part 391: Requirements, analysis and compliance test methods for the reduction of photosensitive seizures (ISO 9241-391:2016)

This document establishes essential technical specifications and guidelines addressing the ergonomic aspects of human-computer interaction, specifically focusing on visual displays that emit flickering light. It outlines comprehensive regulatory requirements designed to minimize the risk of inducing seizures in individuals sensitive to such visual stimuli. The text details precise analytical methodologies for evaluating display systems to ensure they operate within safe parameters regarding flicker frequency and modulation depth. Furthermore, it provides standardized procedures for conducting compliance tests, enabling manufacturers and testing laboratories to verify that electronic products adhere to established safety thresholds. The approach integrates principles from international standards to create a harmonized framework for assessing visual safety. By following these methodological guidelines, stakeholders can systematically identify potential hazards associated with flickering light sources and implement necessary design modifications to protect user health. This guidance supports the development of safer digital interfaces and viewing environments across various application sectors without altering the fundamental technical evaluation process defined in the referenced international specification.