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What is blue light?

The Sun bathes us daily in light, which is one of many types of electromagnetic radiation, along with radio waves, microwaves and gamma rays. We can’t see the vast majority of these energy waves flowing through space, but we can measure them. The light that human eyes can see, as it bounces off objects, has wavelengths of between 380 and 700 nanometres. Within this spectrum, running from violet to red, blue light vibrates with almost the lowest wavelength (400 to 450nm) but almost the highest energy.

Can too much blue light damage my eyes?

With the great outdoors providing by far our most extreme exposure to blue light, we’d know by now if blue light was a problem. That said, staring at low-level blue-dominant light, unblinkingly, for the majority of our waking hours, is a relatively new phenomenon, and digital eyestrain is a common complaint.

So far there’s no evidence that blue light from devices is a culprit. Computer users tend to blink five times less than usual, which could result in dry eyes. And focusing on anything for long periods without a break is a recipe for tired eyes.

You can damage a retina if you point strong blue light at it for long enough, which is why we don’t look directly at the Sun or LED torches.

What is blue light absorbing dye?

Blue Light Harmness: Blue light may also cause possible cataracts and retinal conditions, such as macular degeneration.

Blue light absorbers used on glass lens or filters can reduce blue light and protect our eyes.