Flicker or Pattern Sensitivity (2A)
Students with flicker or pattern sensitivity have a physiological reaction to repetitive patterns, flickering video, or stroboscopic lights. Depending on the specific disability, the student's reaction might take the form of a seizure, pain, or visual overload. A flicker rate of 15 - 20 Hz is considered to be the most likely to trigger a physiological response. Flicker at or above 60 Hz are relatively safe as are very low rates, although seizures have been triggered at as few as 3 Hz.
- Diagnosis of photosensitive epilepsy
- Diagnostic information referring to sensitivity to pattern or flicker.
- When you see flashing lights or fast moving video do you become queasy or have a seizure?
- Do complicated patterns such as optical illusions make you feel like you are motion sick?
- Do quickly moving objects like fans or shadows from trees make you feel disoriented or off-balance?
- What accommodations or strategies have been effective in the past?
- American Epilepsy Society
- Epilepsy Foundation of America
- WCAG 2.0 Flash Guidelines
- Canadian Epilepsy Alliance
- TRACE Photosensitive Epilepsy Analysis Tool
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