“Accessible Design” calls for design that includes the needs of people whose physical, mental, or environmental conditions limit their performance.
Screen readers are software programs that allow blind or visually impaired users to read the text that is displayed on the computer screen with a speech synthesizer. A screen reader is the interface between the computer’s operating system, its applications, and the user.
Audio interfaces present content linearly to users, one item at a time. This contrasts with the way in which most people use visual interfaces by skimming the entire page at once.
Invisible Disabilities is an umbrella term that captures a whole spectrum of hidden disabilities or challenges that are primarily neurological in nature. from Disabled World: Invisible Disabilities Information