The first step is to understand how color vision and contrast affect the perception and readability of your website content. Color vision is the ability to distinguish different colors, and it varies among people. Some people have color vision deficiencies, such as color blindness, that make it hard for them to differentiate certain colors or shades. Contrast is the difference in brightness or color between the foreground and background of your website elements, such as text, images, buttons, and links. Contrast is important for visibility and legibility, especially for people with low vision.