The reading order of a PDF document determines how the document will be read aloud with a screen reader.

You can fix PDF documents that have not been properly tagged during the export from Microsoft Word by adding the tags with Adobe Acrobat.

Adding alternate (alt) text to your images will make your Microsoft Word documents more accessible to people who have visual impairments. This will also make any PDF documents created from your Microsoft Word documents more accessible as well. 
The alt text is a description of the image that can be read to someone who has a visual impairment by screen reader software.

VoiceOver is the screen reader built into IOS, the operating system on Apple’s mobile devices. With VoiceOver, someone with a visual impairment can use a few simple gestures to hear aloud what is displayed on the screen for people who are sighted.

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