We are fortunate to live in an advanced age at the turn of the 21st century. Electronic devices are always with us in our world today and make our every day interactions with our environment easier and safe. Although there are many positive effects we enjoy from these devices in our everyday lives, but a more dangerous side exists to all of this progress and convenience.
Blue light, also known as high energy visible light, is emitted by numerous electronic LED devices, and is a worrisome threat to eye health which was previously unknown and irrelevant in the past. Computers, tablets, e-readers, smartphones and other electronic devices with visual displays all can cause tired eyes, digital eye strain and computer vision syndrome.
Blue light contributes to digital eye strain
Because short-wavelength, high energy blue light scatters more easily than other visible light, it is not as easily focused. When you're looking at computer screens and other digital devices that emit significant amounts of blue light, this unfocused visual "noise" reduces contrast and can contribute to digital eye strain.
What is digital eye strain?
Digital eye strain is the physical discomfort felt after two or more hours in front of a digital screen and is associated with the close to mid-range distance of digital screens, including desktop and laptop computers, tablets, e-readers and smartphones. Digital eye strain symptoms include: dry, irritated eyes, blurred vision, eye fatigue, neck and back pain and headaches.
Prolonged periods of use appear to exacerbate symptoms of eye strain as 96 percent of Americans who experience digital eye strain spend two or more hours each day using devices. A combination of factors foster the onset of digital eye strain, including the proximity of the screen, the frequency and duration of use and the degree of exposure to high-energy visible (HEV) or blue light emitted by video screens.
Excessive screen time can cause depression
Too much screen time also causes habitual inactivity, overstimulates the nervous system and increases production of the stress hormone cortisol. When chronically activated, it triggers the brain’s toxic runaway stress response, which researchers have identified as an ultimate driver of depressive illness. And exposing our eyes to artificial lighting—especially the blueshifted hues of flat screens—delays the body release of melatonin, the drowsiness-inducing hormone, until 45 minutes after we power down. The resulting sleep deprivation can both trigger and compound depression.
How Can We Protect Our Eyes?
The optical industry has developed lens technology to alleviate vision problems and protect eyes from blue light, glare and other environmental stressors.
Computer Glasses and BluTech Lenses
Commonly referred to as computer glasses, this eyewear has lenses that are constructed specifically for the mid-distance range at which users typically view a digital screen, and they can be purchased with or without a prescription. The lenses and filters are customized to reduce blurriness and pixilation, decrease brightness, block blue light, and minimize glare while working in front of a screen—or multiple screens.
Computer glasses are likely equipped with specialty lenses, such as BluTech and Crizal Prevencia, that are meant to reduce or eliminate many of the harmful side effects linked to increased time in front of computers and other electronic devices. This is done by selectively filtering out blue light, which improves visual comfort and reduces eyestrain. Simultaneously, these lenses allow non-harmful light to pass through, permitting the clearest vision possible.
Recharge is another sophisticated choice to help minimize the harmful effects of blue light. HOYA is the advanced eye care company that manufactures these lenses, which reflect nearly 30% of harmful blue light away from the eye.
Between the filtering effect of BluTech/Crizal Prevencia and the reflective properties of the Recharge coating, a great percentage of otherwise extremely harmful blue light never reaches the eye. This is an important element in the long term health of your eyes.
Blue Light Filters
If you are using your phone constantly — especially if you use it primarily for texting, e-mailing and web browsing — a convenient way to reduce your blue light exposure is to use a blue light filter. These filters are available for smart phones, tablets, and computer screens and prevent significant amounts of blue light emitted from these devices from reaching your eyes without affecting the visibility of the display.
Melatonin helps us sleep & blue light causes a reduction in melatonin production, so we can't sleep! Therefore, it is good to avoid digital screens one hour before sleeping, especially in children.
For more on blue light protection, digital eye strain and how to protect yourself, don't hestitate to contact your doctor at Mill Creek Vision in Mill Creek, WA.