Some users may need specific support because of e.g. some visual impairment. Most accessibility features have to be enabled manually. Some boot parameters can be appended to enable accessibility features. Note that on most architectures the boot loader interprets your keyboard as a QWERTY keyboard.
Some accessibility devices are actual boards that are plugged inside the machine and that read text directly from the video memory. To get them to work framebuffer support must be disabled by using the
fb=false boot parameter. This will however reduce the number of available languages.
For users with low vision, the installer can use a high-contrast color theme that makes it more readable. To enable it, append the
theme=dark boot parameter.
Alternatively, Debian can be installed completely automatically by using preseeding. This is documented in Appendix B, Automatiserad installation med förinställningar.
Documentation on accessibility of the installed system is available on the Debian Accessibility wiki page.