Blue light emitted from devices such as cell phones, tablets, and computer screens contribute to Computer Vision Syndrome (CVS). CVS consists of a collection of symptoms including eyestrain, light sensitivity, and headaches. [1] Staring at screen devices for long periods of time, especially during the night, may lead to diseases in the eye [1] and alter the body’s natural cadence. What’s Bad About Blue Light Exposure? Exposure to blue light disturbs the body’s circadian rhythm, the 24-hour internal clock that monitors the body’s sleep/wake cycles. [2] Blue light mimics natural daylight that signals the body to stay awake while suppressing the hormone melatonin that prepares the body for sleep. Blue light also has a few negative effects on the skin.

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Free app adjusts color on monitors to prevent disruption of sleep cycle. Blue light emitted from computer screens can interrupt the hormone that regulates our sleep cycles, studies have shown.

What is Blue Light? Credit: entirelysubjective Flickr Sunlight consists of visible light our eyes interpret as colors and invisible ultraviolet (UV) rays that tan and burn the skin. The visible light emitted by the sun comprises a range of different-colored light rays that contain different amounts of energy. There is an inverse relationship between a light ray’s wavelength (measured in nm) and energy.

The smaller the wavelength, the higher the energy. Blue light has a wavelength between 400-490nm which is why the left one-third of the visible light spectrum is considered high-energy visible (HEV) light.

Excessive HEV exposure is dangerous to your health and can increase the risk for uveal melanoma, cancer within the eye. [3] How Do Blue Light Reducing Apps Work? Cell phones, televisions, tablets, and laptop computers all display images on a liquid crystal display (LCD). Screens consist of tiny dots, called pixels.

Inside each pixel are three colored lights: red, green, and blue (RGB). [4] These three colors light up in various sequences and brightness to create different colors your eye can perceive. For example, to generate the color purple, only the blue and red lights within the pixel would light up. The blue light emitted from these screens can build up over time. Blue light reducing apps limit our exposure to blue light by decreasing the blue light brightness and intensity inside each pixel. The apps listed below make screens appear warmer in color and sometimes creates what looks like a red filter over the screen.

The Best Blue Light Reducing Apps F.lux F.lux uses geolocation to automatically calibrate the device display's color temperature to the time of day based on sunrise and sunset predictions at the chosen location. That is how F.lux matches your screen to the environment you are in. In the evening, your screen will automatically adjust to indoor lighting and will change back to sunlight mode in the morning. Other unique features include “Darkroom Mode” which warms the colors on the screen while shading everything in a dark, reddish hue.