There are many different types of color blindness. How can I ensure that color blind users can access my site?
A variety of tools are available to help with evaluating the accessibility of color combinations, including a tool that allows users to sample their websites as they might be viewed by someone with any of three types of color blindness, and tools that measure whether particular color combinations have sufficient color and brightness contrast. A general rule is that any information that is communicated with color (e.g., “fields with red labels are required”) should also be communicated with some mechanism other than color (e.g., bold text, marked with an asterisk). This way, a user who is unable to perceive color can still access the information.
