Blue light refers to a specific wavelength of light on the visible light spectrum, typically ranging from 400 to 500 nanometers. It is emitted by many modern electronic devices such as smartphones, tablets, computers, and LED lighting. Research has shown that prolonged exposure to blue light, especially at night, can disrupt the body's circadian rhythm and impact sleep quality. Additionally, blue light exposure has been linked to eye strain, digital eye fatigue, and potentially long-term damage to the retina. Some studies also suggest that blue light exposure may have negative effects on mood, cognitive function, and overall health. As a result, there is growing interest in finding ways to mitigate the harmful effects of blue light, such as using blue light blocking glasses or software to reduce blue light emissions from screens.