VARESE – The time spent on PCs, smartphones, TVs or more generally connected has increased significantly in recent months: whether for work or leisure, technology is becoming our most valuable ally for almost any type of business. If the skin, not only of the face but above all that of the hands, begins to suffer from the few hours spent in the open air, the eyes are experiencing an even more intense visual stress due precisely to the need to remain always connected. But what does this imply?
We often hear about blue light on screens and its harmful effects, sometimes also associating symptoms such as tired eyes at the end of the day, dry eyes or redness. For some time, however, there has been an ongoing scientific debate on the real harmful effects of blue light, which have not yet been fully proven.
7 things to know about blue light
ZEISS, always expert and attentive to visual well-being, has decided to clarify, drawing up a list of “7 things to know about blue light”, useful explanations to better understand what blue light is and how to protect yourself if necessary.
- There are two types of blue light: the natural blue light of the sun and the artificial blue light emitted by LED lamps, energy-saving lights and displays of smartphones and computers. Eliminating it completely is not only unnecessary, but it can be counterproductive.
- Blue light is crucial for a normal, rich and contrasting color vision.
- Unlike the studies carried out on harmful effects related to ultraviolet or UV radiation, for blue light scientific research is still ongoing and has yet to come to clear conclusions about possible harmful effects. Undoubtedly, the blue light emitted by artificial light sources or screens can be irritating or cause eye strain.
- Today, exposure to blue light is greater: before the invention of the bulb, the human eye stopped being exposed to the blue light of the sun after sunset. Today this is no longer the case, since we are surrounded by greater quantities of artificial blue light, because modern LED lamps, energy-saving lights and displays of smartphones or tablets, emit a greater portion of blue light than, for example, light bulbs traditional.
- Blue light also affects our psychological well-being: for this reason phototherapy is successfully used to treat winter depression and insomnia.
- Tablet and smartphone displays can cause sleep disturbances: excessive exposure to blue light in the evening and at night can interfere with night's rest.
- Spend an hour outdoors on a normal cloudy day exposes our eyes to blue light 30 times more than a day spent indoors in front of a screen.
While waiting for conclusions from the scientific community, what we know today is that protecting the eyes from blue light is possible: there are treatments, applicable to prescription lenses, such as ZEISS DuraVision BlueProtect®, which limit the visual stress caused by devices digital. These lenses are equipped with a special filter that ensures comfortable vision even when the percentage of blue light emitted is high.
DuraVision BlueProtect is a treatment that attenuates blue light in the range between 390 and 440nm, but which allows “useful” blue light for our body to pass through the lens. According to some studies, blue light in the range between 400 and 520 nm (with a maximum of 460 nm) is fundamental for the regulation of the melatonin level and the circadian rhythm.