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A screen reader is a software application that attempts to identify and interpret what is being displayed on the screen (or, more accurately, sent to standard output, whether a video monitor is present or not). This interpretation is then re-presented to the user with text-to-speech, sound icons, or a Braille output device. 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 AT, such as screen magnifiers. A person's choice of screen reader is dictated by many factors, including platform, cost (even to upgrade a screen reader can cost hundreds of U.S. dollars), and the role of organizations like charities, schools, and employers. Screen reader choice is contentious: differing priorities and strong preferences are common. Microsoft Windows operating systems have included the Microsoft Narrator light-duty screen reader since Windows 2000. Apple Inc. Mac OS X and iOS include VoiceOver, a feature-rich screen reader, while Google's Android includes Google Text-to-Speech, also on Android, Samsung devices have Samsung Text-to-Speech. The console-based Oralux Linux distribution ships with three console screen-reading environments: Emacspeak, Yasr and Speakup. BlackBerry 10 devices such as the BlackBerry Z30 include a built-in screen reader. There is also a free screen reader application for older less powerful BlackBerry (BBOS7 & earlier) devices.〔http://mobileapps.blackberry.com/devicesoftware/entry.do?code=bsr〕 There are also popular free and open source screen readers, such as the Orca for Unix-like systems and NonVisual Desktop Access for Windows. The most widely used screen readers are separate commercial products: JAWS from Freedom Scientific, Window-Eyes from GW Micro, Dolphin Supernova by Dolphin, System Access from Serotek, and ZoomText Magnifier/Reader from AiSquared are prominent examples in the English-speaking market. The opensource screen reader NVDA is gaining popularity. ==Types of screen reader== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「screen reader」の詳細全文を読む スポンサード リンク
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