![]() Press.īrewer, C., Harrower, M., & The Pennsylvania State University. Designing better maps: A guide for GIS users. Cartography and Geographic Information Systems, 24(4), 203–220.īrewer, C. Spectral schemes: Controversial color use on maps. Finally, it introduces several tools that may be used in selecting appropriate colors or used to evaluate color choices when designing maps. It shows that the acquired CVD population is growing and suggests colors and alternatives in map design to minimize that impact. This chapter examines the effects of CVD and attempts to illustrate the impact of color choices on visually impaired audiences. This acquired blue-yellow defect also is the predominant CVD for those suffering from chemical exposure. 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. The predominant color impairment from congenital CVD is a red-green differentiation problem, whereas blue is considered universally recognizable by the congenital group. With the exception of aging, little or no data exists on the number of people impaired by any of these non-congenital causes. CVD also can be acquired from chemical exposure, injury, illness, medication, and aging. Recent studies indicate that over 5% of our Caucasian male population are susceptible to congenital or inherited color vision deficiency. 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. The golden rule of map design states that one should carefully consider both a map’s purpose and its audience. ![]()
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