But if we turn on a dim light in a dark room, our eyes adapt to the change easier because our retina isn’t overstimulated by such a sharp increase in contrast. Such a drastic change in light conditions is harsh to our eyes. This causes the eyes to work harder to adapt to the brightness.Īn example that illustrates this concept is when we turn on a bright light in a dark room.
Such a disparity in color brightness creates intense light levels that overstimulate the eyes when reading text. White has 100% color brightness, and black has 0% color brightness. Pure black text on white backgrounds can cause eye strain when users read the text over an extended period. Designers can do their part to reduce the likelihood of eye strain on their designs by paying attention to the color of black they use. Did you know that pure black text can cause eye strain? A survey found that “58 percent of adults in the U.S.” have experienced eye strain from working on computers.
