Aspects of Perception
Illustrates "how people with less than three types of cones can confuse different wavelengths."
Color Vision Deficiency Information & Products
Searchable Online Accommodation Resource provides contact details for United States makers and suppliers of assistive devices.
Colorblind HomePage
Explains mechanics and physiology, and includes color wheels to simulate what the disabled see.
Colorblindness
Includes an Ishihara plate, information from those disabled and their relatives, and links to media articles. The names of colors appear in the color.
Colors for the Color Blind
Provides background information and a set of charts to help those working with computer colors.
Colour Blindness
Wikipedia article includes a simple diagnostic test, rates of incidence, causes, and types of deficiency.
Drugs Affecting Color Vision
Lists common medications that are thought to contribute to this condition.
Mayo Clinic: Poor Color Vision
Includes overview, causes, screening and diagnosis, treatment, and coping skills.
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