Courses Projects

Human Computer Interaction 2010


Accessibility is intented to ensure that our work will be usable and available to the largest possible number of readers, visitors and customers;

For users who:
  • May not be able to see, hear, move, or process some types of information easily or at all;
  • Have a voice browser;
  • Have difficulty reading or processing information due to cognitive disabilities;
  • May not have or be able to use (or for some reason do not have) a keyboard or mouse;
  • Have a text-only screen, or an older computer;
  • May be using a device such as a cell phone or a PDA;
Users should be able to:
  • Read and react to text and images;
  • Type on a standard keyboard;
  • Point & click on text, images & widgets;
  • Hear and react to sounds played;


  1. Visual impairments & print disabilities
    • Blind and deaf-blind people use screen reading software;
    • Partially sighted people may use font/contrast settings or screen magnification software;
    • Dyslexic people use text to speech software combined with word highlighting;
  2. Physical disabilities
    • Quadriplegics use the keyboard with a mouth stick, on screen keybords, domicile software, speech input software and head/eye tracking mice;
    • One handed typists use sticky-key software;
    • People with ALS or cerebral palsy may use filter keys, word prediction software and single switch devices;
  3. Other disabilities
    • Hearing impaired people need software that do not rely on sound for cues;
    • Color blind people need software that does not rely on color alone;
    • Persons with cognitive and learning disbilities need software with simple layout and messages;
    • Persons with epilepsy need software with no flashing or blinking;
Ishihara 29 test diagram
Ishihara 26 test diagram
Ishihara 45 test diagram


W3C launched WAI with the task to create guidelines ( WCAG 2.0 ) for making web content accesible to people with disabilities;

Section 508 is an american law which is intented to end discrimination against people with disabilities ("equal or equivalent access to everyone");

WAI Site Example

Normal View

Normal View

Without Images

Without Images

Without Style

Without Style


Lynx View

Screen Readers

Screen Readers


Diabetic Retinopathy

Places an image mask over the current page that simulates the effects upon vision experienced by people who have Diabetic Retinopathy

Diabetic Retinopathy Simulation


Blurs the page content simulating the effect upon vision experienced by people who have Cataracts

Cataracts Simulation

Simulations done using IE Web Accessibility Toolbar

Other simulations are available for affections like Macular Degeneration, Glaucoma, etc.

evalica 2010