What are "mitigating measures" with respect to a disability?

The Americans with Disabilities Act Amendments Act of 2008 (ADAAA), defines "mitigating measures" as things that lessen or ameliorate the effects of an impairment, including, but not limited to:

• medication, medical supplies, equipment, or appliances, low-vision devices (not including ordinary eyeglasses or contact lenses), prosthetics, including limbs and devices, hearing aids and cochlear implants, or other implantable hearing devices, mobility devices, or oxygen therapy equipment and supplies;
• use of assistive technology;
• reasonable accommodations or auxiliary aids or services; or
• learned behavioral or adaptive neurological modifications.