Hardware Self Contained, Closed Products checklist

Avoid causing the screen to flicker with a frequency greater than 2 Hz and less than 55 Hz.

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.

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The following technique is the minimum required to meet Checkpoint 5.2 from the IBM Hardware Self Contained, Closed Products Accessibility Checklist:

• Do not have the screen flicker with a frequency between 2 Hz and 55 Hz.

The technique above is required; the following techniques are recommended to enhance accessibility:

• 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.

Tools

Software test cases are needed to test this checkpoint:

Techniques