iMac screen is too bright for sensitive eyes. Shades is the solution. Shades is the utility for controlling the brightness of your iMac screen. When you use the iMac at night, you might find it is too bright for your eyes even though you have turned the screen to the darkest setting. This app comes to help. It makes really easy for you to change the screen to the darkest mode. It will make the screen much more comfortable to use. The app does not support the shades if other apps run in fullscreen mode.