Screen Readers

What is a screen reader?

A screen reader is a software application that attempts to identify and interpret what is being displayed on the computer screen and convert the text into Speech output. Screen readers are a form of assistive technology (AT) potentially useful to people who are blind, visually impaired, illiterate or learning disabled, often in combination with other assistive technologies such as screen magnifiers. More information at External WebsiteScreen readers in Wikipedia.

How does Screen readers work

On a windows platform any Active Accessibility Client (screen reader) will send a request to the active accessibility server to get the information of any UI element. A dynamic-link library (DLL), OLEACC, provides the Active Accessibility runtime and manages requests from Active Accessibility clients. The servers communicate with clients by sending event notifications and responding to client requests for access to UI elements.

Screen Reader commands & Gestures

The following table provides the list of screen readers and links for the their corresponding commands or gestures.

Screen readers & links for commands
Screen reader Vender Links for commands/ gestures
JAWS Freedom Scientific JAWS commands
NVDA NV Access NVDA Commands
Window Eyes GW Micro Window Eyes Commands
VoiceOver on MAC Apple VoiceOver for MAC commands
VoiceOver for IOS Apple VoiceOver gestures for IOS )
Talkback on Android Google Talkback gestures
Narrator on Windows mobile MicroSoft Narrator gestures (Future link)


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