Page vs Document
This preference determines how much of a document is delivered to a screen reader at a time. If a PDF isn’t tagged, Foxit PDF Editor may analyze the document and attempt to infer its structure, which can take a long time for a long document. You may want to set Foxit PDF Editor to deliver only the currently visible page so that it analyzes only a small piece of the document at a time. This consideration will vary depending on the size and complexity of the document and on the features of the screen reader.
Only read the currently visible pages - This option is usually best when using a screen magnifier. It improves performance by eliminating the need for the software to process parts of the document that aren’t visible. When Foxit PDF Editor sends only the currently visible pages of a PDF to the memory buffer, the assistive technology has access to those pages only. It cannot go to another page until the next page is visible and Foxit PDF Editor has sent the page information to the memory buffer. Therefore, if this option is selected, you must use the navigation features of Foxit PDF Editor, not those of the assistive technology, to navigate from page to page in the document. You should also set the Default Page Display option in preferences to Single Page if you choose to have Foxit PDF Editor send only the currently visible pages to the assistive technology.
Read the entire document - This option can be best if you use a screen reader that has its own navigation and search tools and that is more familiar to you than the commands in Foxit PDF Editor.
For large documents, only read the currently visible pages - This option is selected by default and is usually best if you use a screen reader with long or complex PDFs. It allows Foxit PDF Editor to deliver an entire small document but revert to page-by-page delivery for large documents.
Minimum number of pages in a large document
When the “For large documents, only read the currently visible pages” option is selected, it allows you to set this minimum value.
Enable assistive technology support: Check this option to allow assistive technology products, such as screen readers, to provide information about the UI and document to end users.
Confirm before preparing untagged PDF for reading with assistive technology: Select the option, and if any assistive technology is detected in your system, a dialog box pops up when you open an untagged PDF to ask you whether to set the reading order options for the PDF for reading with assistive technology.
Reading Order
Set reading order as appropriate for your assistive software and devices.
Infer reading order from document (recommended):Interpret the reading order of untagged documents by using an advanced method of structure-inference layout analysis.
Left-to-right, top-to-bottom reading order: Deliver the text according to its placement on the page, reading from left to right and then top to bottom. This method is faster than “Infer reading order from document”. This method analyzes text only; form fields are ignored and tables aren’t recognized as such.
Use reading order in raw print stream: Deliver text in the order in which it was recorded in the print stream (i.e., the text object order stored in the content stream). This method is faster than “Infer reading order from document”. This method analyzes text only; form fields are ignored and tables aren’t recognized as such.
Override the reading order in tagged documents: Use the reading order specified in the Reading preferences instead of what the tag structure of the document specifies. Use this preference only when you encounter problems in poorly tagged PDFs.