1.6 If using a touchscreen or contact-sensitive controls, do not require that it is touched by a body part
Using a touchscreen or contact-sensitive controls requires that it is touched by something that it can detect. Depending on the technology employed, it may or may not be able to detect touches by objects such as a pen, a pointing stick or a prosthetic device. It should be able to react to whatever a user might need to touch it with.
A person who has lost a limb, such as an arm or hand, will use a prosthetic device such as an artificial hand. They may well have sufficient control to be able to accurately point at and press buttons or keys. However, the prosthesis may be made of metal, plastic, or some other material with dialectric properties that are different from those of a human finger. The terminal will therefore have to be able to detect this other material in order to react to the user's inputs.
Avoid using screens that react to capacitance changes
There are no specific test methods recommended for this guideline.