Screen Colors Filter — blocks high-energy visible light (HEV light) in the violet/blue band from 400 to 500 nm in the visible spectrum & designed for those who works a lot at night. When youre in a low-light environment or reading long book changing white background to black background is really helpful. Limit your Mac screen exposure to energy-efficient lighting and reduce eye strain to help you focus on the most important things on the screen. Change the colors of your screen to reduce the amount of blue light. Key features: - Work efficiently in low-light environment, - Reduce the amount of blue light, - 16 color presets for your convenience, - Dim slider to fine tune screen colors, - Completely invert screen color palette.