Visual threshold

Visual threshold refers to the smallest amount of visual information or contrast needed for the human eye to detect an object or difference under specific conditions. It’s the point where something becomes just noticeable to you—like a faint outline or subtle variation in color. Factors such as lighting, distance, and the observer’s eyesight influence this threshold. Understanding it helps in designing images, displays, and lighting that are easily perceptible, ensuring visual information is effectively communicated. Basically, it's the limit at which your eyes can distinguish a visual detail from the background.