9-9.1 Rationale

This provision applies to those products that already allow a user to adjust screen colors and contrast.

This provision requires more than just providing color choices. When shades of gray (black and white contrast) are available, this provision also applies. The available choices must also allow for different levels of contrast. Many people experience a high degree of sensitivity to bright displays. People with this condition cannot focus on a bright screen for long because they will soon be unable to distinguish individual letters. An overly bright background causes a visual “white–out.” To alleviate this problem, the user must be able to select a softer background and appropriate foreground colors. On the other hand, many visually impaired people can work most efficiently when the screen is set with very sharp contrast settings. Because individual needs vary so much, a program must have a variety of color and contrast settings. (See Section 5-9, Software Applications and Operating Systems: User–Selected Display Attributes, Color, and Contrast.)