Search results
The science behind visual acuity, legibility, and text size.
All sighted people, including those with with color insensitive vision need adequate visual contrast to read and understand text and graphic elements. By Visual Contrast we mean the difference between perceived lightness and darkness.
People with color blindness need adequate luminance contrast to perceive text and graphic elements, and some color pairs require greater contrast than others to compensate. People with low vision (due to poor contrast sensitivity and/or visual acuity) may need higher visual contrast for readability.
A clean and clear visual presentation helps everyone make sense of a website’s information and functionality. How to use this guide: We recommend planning for accessibility in your design process and regularly conducting accessibility testing throughout the design and development processes.
AA means that your text has a contrast ratio of at least 4.5 or higher. For example, 777777 text on a ffffff background and vice versa. There is empirical evidence that visual acuity of 20/40 is associated with a contrast sensitivity loss of roughly 1.5, which is where the 4.5 score is derived.
30 paź 2022 · To design accessible visuals, account for color contrast, don’t rely on color alone, make interactive elements easy to identify, provide useful alternative text for images, and test your visuals with real users.
12 mar 2023 · The APCA Readability Criterion (ARC) is a modern set of design guidelines or visual content utilizing the Accessible Perceptual Contrast Algorithm (APCA), which is tuned for perceptual uniformity of text and non-text elements, as displayed on a self-illuminated monitor or device.
