No monitors, no problem. Tuukka Ojala on his experience of being a blind developer.
Speech or braille alone can’t paint an accurate representation of how a window is laid out visually. All the information is presented to me in a linear fashion. If you copy a web page and paste it into notepad you get a rough idea of how web pages look to me. It’s just a bunch of lines stacked on top of another with most of the formatting stripped out. However, a screen reader can pick up on the semantics used in the HTML of the web page, so that links, headings, form fields etc. are announced to me correctly. That’s right: I don’t know that a check box is a check box if it’s only styled to look like one. However, more on that later; I’ll be devoting an entire post to this subject. Just remember that the example I just gave is a crime against humanity.