The visual setting in iOS 12 inverts the standard light interface to display a predominantly dark color palette. This adjustment affects system-wide elements such as menus, settings, and compatible applications. For example, instead of a white background with black text, the display presents a black background with white text.
Implementation of this alternate display option can reduce eye strain, particularly in low-light environments. Battery life on devices with OLED screens may also be extended. This display setting was a precursor to more comprehensive system-wide dark mode implementations in later iOS versions, addressing user requests for improved visual comfort and accessibility.