It’s one thing to talk about colour blindness, but it is quite another to see what it looks like to the 6-10 percent of the population that have colour vision deficiency. Axess Lab has produced an excellent set of successes and failuresusing real life examples of colours used by web designers. These examples provide really good guidance for anyone involved in web content and design, as well as printed material. The blog page has links to more information. There is a nice pic of what a football field looks like to someone who can’t see red and green – so it’s not all about the web – it’s all around us as the picture shows. If you want to see more on this topic see ColourBlindAwareness Twitter feed.
The banner in the picture shown should read You Are Not Alone, instead it looks like, You Are Alone.
Location is everything – finding it is another. Being able to find places easily is key to getting out and about at any age or level of capability. Online maps are becoming more sophisticated with interactive content and different layers of information. Graphics and colour are used to emphasise places and attributes. But not everyone can see certain colours. The number of people with colour vision deficiency (CVD) is growing as some people acquire it as they get older. Map Design for the Color Vision Deficient provides a background to this issue and tools for selecting the colours when designing maps. You will need institutional access for a free read.
Abstract: The golden rule of map design states that one should carefully consider both a map’s purpose and its audience. Maps designed for the general public frequently fail to consider the portion of our population with color vision impairment or color vision deficiency (CVD), known more commonly as color blindness. Recent studies indicate that over 5% of our Caucasian male population are susceptible to congenital or inherited color vision deficiency. CVD also can be acquired from chemical exposure, injury, illness, medication, and aging. With the exception of aging, little or no data exists on the number of people impaired by any of these non-congenital causes. The predominant color impairment from congenital CVD is a red-green differentiation problem, whereas blue is considered universally recognizable by the congenital group. However, recent research has revealed that as many as 20% of those studied over the age of 72 suffer from a blue-yellow defect that increases with age to nearly 50% at age 90. This acquired blue-yellow defect also is the predominant CVD for those suffering from chemical exposure. This chapter examines the effects of CVD and attempts to illustrate the impact of color choices on visually impaired audiences. It shows that the acquired CVD population is growing and suggests colors and alternatives in map design to minimize that impact. Finally, it introduces several tools that may be used in selecting appropriate colors or used to evaluate color choices when designing maps.
There is a growing body of science on the topic of colour use and choice. On the second page of the International Ergonomics Associationnewsletter there is an item advising that in developing an international standard (ISO 24505) for colour use, accessibility needs to be considered. In four parts, the first part of the standard has been published for older people taking into account age-related changes in human colour vision. The remaining three are under development. Here is a snippet from the newsletter:
“The “colour category theory” tells us all the colours are perceived in groups of similar colours at the central level of the brain (not in the retinal level), such as red, green, blue, etc. According to the theory there are a limited number of colour categories (groups), 11 to 13 depending on the studies, in each of which colours are perceived as a group of similar ones. For example, an orangish-red and a purplish-red are both perceived in the same colour category labelled “red”. As intuitively understood from the theory, colours within a same category are apt to be confused, but on the contrary colours belonging to different categories can be easily differentiated. This idea could be applied to the choice of colors for color combinations. The problem is which colours belong to which categories.”
The aim of the International Ergonomics Association (IEA) Ergonomics in Design for All Technical Committee is to promote Ergonomics in Design-for-All (the European equivalent of universal design).