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Blue Light: What You Need to Know

Updated: Apr 14, 2020

Protecting your eyes from blue light can do much more than relieve eye strain.

Is it good or is it bad?

During the day, blue light is like nature's cup of coffee. Blue-turquoise light (380-500nm) makes up roughly one-third of visible light, with the majority coming from the sun. When your eyes receive blue light during the day you experience a boost in alertness, brain function and feel energized. By giving you energy during the day and decreasing as the sun goes down, it regulates the circadian rhythm and is super important for your health and well being. However, the benefit is in the timing.

The amount of blue light you get from daylight is fine, but excessive blue light should be avoided during the evening. The compounding effects of blue light over time (specifically between 380nm and 450nm) are harmful and damaging to retinal cells because your eyes cannot filter out light very well. Excessive blue light emitted from phones and computer screens can be irritating for many people, causing eye strain at the end of the day, and suppressing the secretion of melatonin at night making it hard to fall asleep.

Looking for ways to block it? Blue light lenses have an anti-reflective (AR) coating that cuts down on glare and reduces the amount of blue light that passes through your lenses. This can reduce sleep disruption, neck pain, and tired eyes. Blue light AR also helps with night time driving because modern headlights are higher in the blue light spectrum – filtering out blue light cuts down on light halos and allows you to have more comfortable vision in these situations.


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