Cognitive Disorder

Nature of disability: Acquired
Age group concerned: Mainly adults
Number of people affected: Fewer cases

Acalculia

Acalculia refers to calculation difficulties as a result of a defect in another cognitive domain, such as attention, language, spatial, or memory.

Loss of the ability to understand and/or produce numbers and perform basic calculations.

Complex navigation mechanisms and page layouts that are difficult to understand and use
Lack of clear structure and overabundance of content
Complex sentences that are difficult to read and unusual words that are hard to understand
Unconventional fonts that are difficult to read
Long passages of text without images, graphics or other illustrations to highlight the context
Moving, flashing or flickering content and background sound that cannot be turned off
Web browsers and media players that do not provide mechanisms for removing animations and sound
Visual page designs that cannot be adapted using web browser controls or custom style sheets

Clearly structured content for easy overview and orientation
Consistent labelling of forms, buttons and other content elements
Predictable link targets, affordant functionality and overall interaction
Different ways of navigating websites, such as hierarchical menus and search
Options to remove flashing, flickering, blinking and otherwise distracting content
Simpler text complemented by images, graphics and other illustrations
Ability to change focus options (e.g. reading mask, text-to-speech word highlighting)
Customisable text and content (text spacing, words, font)