It is a given fact that all PDF users interact with PDFs differently. In some cases, end-users viewing your PDF may have visual impairments or problems with hand joints and because of such ailments, interacting with computer hardware and software applications can be difficult. This is especially true when navigating long and complex PDF files.
Fortunately, in Section 508 of The U.S Rehabilitation Act, it is stated that all federal agencies must ensure that all digital content is accessible to people with disabilities. In compliance with this regulation, Adobe has offered a way for assistive devices to access PDF file content and interpret it for users. To do this, format your PDF with accessibility preferences.