Grays and blacks appear darker when against a lighter background. This works on the same principle as the simultaneous contrast illusion. This is what leads to dry eyes, dizziness and headaches.īy placing a light behind the television, you are raising the average ambient light in the room and reducing the strain on your eyes, meaning you can watch television or work for longer without all the negative side effects.Īs an added bonus, your perception of the contrast on the display will increase. This forces your eyes to work harder and fatigue more quickly than they normally would. In other words, your eyes do not properly dilate for the amount of light they're taking in. Despite the fact that we accurately perceive the screen to be very bright in relationship to the rest of the scene our eyes take in, our eyes attempt to adjust based on the average brightness across the entire field of view and not the average brightness of the screen (or, conversely, the dimmer off-screen area). Staring at a bright display in an otherwise dark environment disrupts how our eyes measure the light: When we watch television or use a computer workstation in a completely dark or significantly darkened room, we create a less-than-ideal viewing situation wherein our eyes are staring very intently at a small window of very bright light that is floating in a sea of darkness. Why does it work? Your eyes work on a system of averages, says Jason Fitzpatrick of How-To Geek. It works by giving your eyes a more neutral reference point for colors and contrast in a dark room. Why bias lighting worksīacklighting of a television or monitor is called bias lighting. Learn what bias lighting is and why it works so well. All you need is a properly placed light source. Surprisingly, fighting eye strain and improving the quality of your nighttime movies or work sessions is actually very simple. Your eyes get scratchy and dry, you experience blurred vision, and you might even get a slight headache. When working late into the night at your computer or binging your favorite TV show on Netflix, you've likely experienced some form of eye strain.
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