Rationale Displays which flicker or flash can cause epileptic seizures in susceptible individuals, particularly if the flash has a high intensity and is within certain frequency ranges. This includes flashing text, turning graphics on and off or repeatedly changing between different images on the screen. The following technique is the minimum required to meet Checkpoint 6.2 from the IBM Hardware Peripherals Accessibility Checklist . Minimize the area of the screen which is flashing.
Smaller areas are less likely to cause seizures.
Avoid flashing which has a high level of contrast between the states. Some individuals are more susceptible to high intensity flashing.