Avoid causing the screen to flicker with a frequency greater than 2 Hz and less than 55 Hz.
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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.
Required development techniques
The following technique is the minimum required to meet Checkpoint 5.2 from the IBM Hardware Self Contained, Closed Products Accessibility Checklist:
Recommended development techniques
The technique above is required; the following techniques are recommended to enhance accessibility:
Required test techniques
Test the hardware to ensure that it complies with accessibility requirements.
Software test cases are needed to test this checkpoint:
1. Verify that there is no flicker with a frequency greater than 2 Hz or less than 55 Hz.
Verify through code inspection.
©2009 IBM Corporation
Last updated September 01, 2009.