“This article is Part IV of my series ‘Color Theory for Digital Displays’. It describes how you can use color in applications and on Web pages to ensure that they are accessible to people who have color-deficient vision. If you do not consider the needs of people with color-deficient vision when choosing color schemes for applications and Web pages, those you create may be difficult to use or even indecipherable for about one in twelve users.” (Pabini Gabriel-Petit – UXmatters)