For systems with visual content, people may need to be able to avoid visual patterns that cause seizures or adjust the viewing of such visual patterns so that they are safe.
Notes
Hazardous patterns are specific to a person and may also be influenced by viewing environment and psychological state of the viewer (e.g., stress, fatigue, etc.).
The patterns may be...
- Patterns in time, such as flashing or flickering.
- Patterns in space, such as high contrast parallel lines, waves, or concentric circles.
Mappings
| Functional ability | Accommodation type | Accessibility characteristic |
|---|---|---|
| Visual | Avoid | Visual content |
References
- Reference: 4-6-a to avoid visual patterns that cause seizures
- Reference: 4-8-a to avoid patterns that cause seizures
- Reference: ISO 9241-391: Ergonomics of human-system interaction—Part 391: Requirements, analysis and compliance test methods for the reduction of photosensitive seizures
- Reference: Recommendation ITU-R BT.1702: Guidance for the reduction of photosensitive epileptic seizures caused by television
- Reference: アニメーション等の映像手法に関するガイドライン (Guidelines on video methods such as animation)
- Reference: Annex 1: Ofcom Guidance Note on Flashing Images and Regular Patterns in Television
- Reference: Three Flashes
- Reference: Three Flashes or Below Threshold
Tags
Imported from https://github.com/accessiblecommunity/Digital-Accessibility-Framework/no-visual-seizure-triggers.md