Screen readers are software programs that allow those who have difficulty reading printed text, or interpreting icons, access to content. People who are completely blind are the primary users of screen readers. They can also be used by people with dyslexia, low vision, or by anyone who may not be able to look at a screen.
People with disabilities may use assistive technology to navigate the web, but they aren’t the only users of assistive technology. These tools provide many people with support in daily living, and provide a greater sense of independence online and offline.
The ability to detect if assistive technology is in use is a common feature that developers request, and one that users with disabilities push back against. This article goes over the reasons users are reluctant to embrace a feature of this kind, and why it might not be a good idea to use it, even if it did exist.