Some specific learning disabilities can affect ability to focus. Some individuals learn more slowly or have difficulty understanding complex concepts. Avoidance of these visual or audio frequencies in Web sites prevents inadvertent triggering of seizures. Examples include impairments in vision, hearing, memory, or dexterity, any of which can affect an individual's ability to access Web content, however together these conditions can be more complex to accommodate. For example, someone with low vision may need screen magnification, however one loses some surrounding contextual information when using screen magnification, which may further hinder an individual who also has limited short-term memory.
Barriers can include any of the issues already mentioned above.
The following is a list of assistive technologies that some people with disabilities use to browse the Web. Assistive technologies are products used by people with disabilities to help accomplish tasks that they cannot accomplish otherwise or could not do easily otherwise. Some assistive technologies rely on output of other user agents, such as graphical desktop browsers, text browsers, voice browsers, multimedia players, plug-ins. Applications that can be operated entirely from the standard keyboard , with no mouse movements required, support single-switch access or access via alternative keyboards. Braille and refreshable braille Braille is a technique involving six to eight dots that are raised in different patterns to represent letters and numbers so that they may be read by people who are blind using their fingertips.