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People who are blind and visually impaired can, and do, use computers, phones, and other electronic devices just as much as sighted people. People who are blind just have different ways of accessing these devices. Blind people use what's called assistive technology, including screen readers, refreshable braille displays, and digital screen magnification to interact with high-tech products.

 

Assistive technology is any hardware or software used by people with disabilities to access computers, phones, tablets, and printed materials. There are many types of assistive technology, and different disabilities require different technologies. 

 

Please read the article which  i shared you ,

http://wonderopolis.org/wonder/how-do-people-who-are-blind-use-computers-and-other-technology

 

 http://evengrounds.com/blog/how-do-blind-people-use-the-computer

 

https://www.quora.com/How-do-the-blind-use-computers

https://www.youtube.com/watch?v=Du6z2LC8rUA