Most of us spend an increasing percentage of our waking hours staring at a digital screen of one kind or another. If it’s not a mobile phone or a tablet, it’s a computer screen at work, or a laptop or an HD TV screen at home. Given the pervasiveness of digital technology in our lives, there is no question that we need to become more aware of how this unprecedented increase in exposure to blue light radiation may be affecting our health.


Exposure to blue light at night can disrupt sleep patterns

Natural blue light helps elevate your mood and boost awareness, but chronic exposure to artificial or digital blue light at night can lower the production of melatonin, the hormone that regulates sleep, and disrupt your circadian rhythm.

Harvard researchers have proven that working the night shift and exposure to blue light at night is associated with increased risk of several types of cancer (most notably breast and prostate cancer) diabetes, heart disease, obesity and an increased risk for depression.

Researchers aren’t exactly sure why exposure to blue light at night seems to have such detrimental effects on our health, but it is known that exposure to light from digital devices suppresses the secretion of melatonin and lowers melatonin levels.

Young people are especially at risk

We all know that young people are even more exposed than the general population. It’s a fact that 84% of American teenagers aged 12 to 17 access the internet on cell phones, tablets, and other mobile devices. In two American surveys of children aged 12 to 15 years released in July 2014, researchers at the U.S. Center for Disease Control and Prevention found that nearly three-quarters spent at least two hours a day watching TV and using a computer.

The surveys also found that 15 percent of teens watch four or more hours of TV daily, while nearly 12 percent report using their computers for four or more hours a day.

But we’re now in 2017. And Generation X, Y and Z are glued to their smartphones. As social media becomes an increasingly important part of the lives of adults too, our phones in our pockets are an integral part of who we are.

Dr Marjorie Hogan, a paediatrician who helped write the American Academy of Pediatrics guidelines on kids’ screen time, recognizes parents have a tough task limiting TV and computers for kids in that 12 to 15 age range – especially in the age of social media.

The evolution in digital screen technology has advanced dramatically over the years, and many of today’s electronic devices use LED backlight technology to help enhance screen brightness and clarity. These LEDs emit very strong blue light waves.  Cell phones, computers, iPads, tablets and flat-screen TVs are just among a few of the devices that use this technology.  Because of their widespread use and increasing popularity, we are gradually being exposed to more and more sources of blue light and for longer periods of time. And that’s not to mention fluorescent lights, which are also a source of blue-violet radiation.

Crizal Prevencia lenses selectively filter out harmful blue-violet rays

The solution? You can either move to the Himalayas, and sell all your digital devices on Gumtree, or wear spectacles that filter out harmful blue rays when spending time looking at the screen of a digital device.

Crizal® Prevencia® lenses have been specifically designed to protect your eyes from the most harmful band of blue-violet light* – which is strongly emitted from digital devices – while allowing beneficial blue-turquoise light to pass through. It is the only lens available in South Africa to offer this important benefit.

* In vitro experiments by Essilor and Paris Vision Institute in 2011 discovered the precise band of light (415-455nm) that is the most harmful for the retinal cells.


Crizal Prevencia lenses are the only lenses available in South Africa today that selectively filter out the harmful blue-violet rays while allowing the benficial blue-turquoise rays to pass through, limiting your risk of long-term eye damage and the debilitating effect on your health that comes from disrupted sleep patterns.