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The Effect of Blue Light

Blue light, in particular at the 450nm point, is hard on the eyes for several reasons. This is the area that digital devices produce and this blue light is the only light that penetrates the eye all the way to the back to the retina.  Blue light between 380 and 470nm is considered bad blue light because it can cause accumulated damage to the retina, cause cataracts, and is linked to sleep disorders.

Not all the blue light is bad though. Blue light from 470 to 500nm, also called blue turquoise light, is generally considered good blue light. This range of visible blue light is beneficial because it provides natural reflexes protecting eyes from light overexposure and helps cognitive and memory function. It also stimulates the photosensitive retinal ganglion cells, stimulates pupillary reflex and controls the circadian cycle.

We are in the era of electronics. In the evening you are probably watching your favourite movie on Netflix, YouTube, TV, surfing the web or catching up on your work on computer or a tablet. These artificial lights from screen gadgets emit a blue glow, a light wavelength similar to the day time sky. This blue light enters your eyes and signals your brain to think it is still day time. Taking this signal, your brain will then restricts the flow of melatonin through your body.

While many are aware of how blue light from electronics disrupts sleep, many do not know that about 25% of the blue light from fluorescent lighting and 35% from LED lights is also damaging to eye health. Over time this will raise the risk of vision problems including macular degeneration.  

Melatonin effects
Melatonin (also known as the sleep hormone) is naturally produced in your body, when your eyes sense darkness at night. In addition to helping you sleep better, it sets your sleep-wake cycle. Imagine just waking up naturally without having to use an annoying alarm clock and actually feeling fresh in the morning. 

Source: Skye Gould/Tech Insider
Source: Skye Gould/Tech Insider

Other blue light blocking lens solutions only add coatings on the lens surface to reduce the amount of blue light that passes through the lens and into your eye. This has a very limited effect and only blocks about 10 to 20% of the harmful blue light.

Zicht lenses are carefully formulated to filter and balance light while absorbing 65% of (HEV) blue light emitted from digital devices. By designing our lenses to shift the color spectrum for visual efficiency, the Zicht amber lens takes artificial light and precisely tunes it to the physiology of the eye.

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