There is a widely circulated joke which states that the coder’s system is of vampires and is therefore scared of light. Best for Eyes: This mode makes it much easier for the users to take care of their eyes because, compared to bright light, the dark mode does not harm the eyes.Easy Focus: Various researchers have suggested that it has been easier for them to work for longer hours when the color contrast of the screen is dark because they can easily focus on the main content.