How is Blue Light Harmful?

How is Blue Light harmful?

Almost all visible blue light passes through the cornea and lens and reaches the retina. This light may affect vision and could prematurely age the eyes. Early research shows that too much exposure to blue light could lead to:

Digital eyestrain: Blue light from computer screens and digital devices can decrease contrast leading to digital eyestrain. Because short-wavelength, high energy blue light scatters more easily than other visible light, it is not as easily focused. When you're looking at computer screens and other digital devices that emit significant amounts of blue light, this unfocused visual "noise" reduces contrast and can contribute to digital eyestrain. Fatigue, dry eyes, bad lighting, or how you sit in front of the computer can cause eyestrain. Symptoms of eyestrain include sore or irritated eyes and difficulty focusing.

Retina damage: Studies suggest that continued exposure to blue light over time could lead to damaged retinal cells. The fact that blue light penetrates all the way to the retina (the inner lining of the back of the eye) is important, because laboratory studies have shown that too much exposure to blue light can damage light-sensitive cells in the retina. This can cause vision problems that resemble those of age-related macular degeneration, which can lead to permanent vision loss.

 Lower Quality of Sleep: Exposure to all colours of light helps control your natural sleep and wake cycle, or circadian rhythm. More so than any other colour, blue light messes with your body's ability to prepare for sleep because it blocks a hormone called melatonin that makes you sleepy. This will make it harder to fall asleep and will worsen the quality of sleep, making you feel tired and unrefreshed in the morning.

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