Blu Light Smartphone

To avoid harm, the eye defends itself: it narrows its pupils, the eyelids close, you look away from intense light to protect the retina.

Blue light is part of the natural light spectrum but, while the sun’s blue light spectrum has a long wavelength due to distance and attenuated by the earth’s atmosphere, the same cannot be said for blue light emitted by device screens, with higher frequencies.

Blue light is not harmful in itself but excessive and prolonged exposure to it is, such as exposure on smartphone screens.

Exploited to render screens clearer under sunlight, recently, it has been widely investigated to confirm or exclude its link to early macular degeneration of the retina, damage to the lens – such as cataracts – and conjunctival and corneal inflammation.

Nobody needs advice.

We know it’s pointless to advise you against prolonged and fixed exposure to a screen, but certain behavior can easily turn into habits: look away whenever you can (every 20 minutes is advisable) towards a point in the distance to relax and rest the eyes.

This simple exercise gives are eyes a moment of respite and trains them to quickly accommodate vision at different focal points. Not to do so excessively fatigues eyesight.  Screens inhibit normal blinking of the eyelids, an important function to hydrate the cornea.

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If your eyes are tired or red, see an eye specialist (don’t put it off) and consider advice to adopt lenses that reduce the quantity of blue light that reaches your eyes.

Ever been blinded by modern LED or Xenon headlights on the highway?

In the evening, and in all poor lighting conditions, the eye switches sensitivity from green to blue, that is perceived more intensely.

Smartphones are perfect for disrupting sleep » explains Russell Johnson, professor of management at Michigan State University. «Keep us mentally engaged until late into the night inhibits our ability to switch off from work, relax and fall asleep – Source

It would seem that exposure to the blue light wavelengths, especially after sunset, affects the sleep patterns (circadian rhythm) due to the reduction in melatonin, the cerebral neurotransmitter that regulates sleep-wake cycles.

Not all blue light is bad. The labeled blue-turquoise light range, which is from 465 nm to 495 nm, is essential to our vision, the function of our pupillary reflex, and in general to human health. It also helps to regulate our Circadian sleep/wake cycle.11 So blue light in general can have healthy affects on vision as well as the body, and it is this blue-turquoise light that tends to have these beneficial effects. Inadequate light exposure means inadequate blue-turquoise light, which can throw off our Circadian biological clock and our sleep/wake cycle. So this blue-turquoise light really plays a vital role in the general health of the individual – Fonte

Many experts concur in advising against using smartphones in the hour prior to going to bed.

Download from the stores one of the numerous applications that adjust the light intensity on devices (simply search for “blue light filter” to find the one you need). You can choose the time, color, whether to block the screen or not, whether to extend the filter to the navigation buttons on your smartphone. 

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