What is blue light?
We’ve all found ourselves tired and irritable during the workday. Sitting for long hours staring at our computer screens, can leave us tense, unfocused and sometimes with a pounding headache. Blue light may sound pretty innocent, but without using some kind of blue light blocker, it's actually pretty bad for us.
What we see – the visible spectrum of light – consists of a range of colors, from blue-violet on the lower end to red on the higher end. Light on the lowest end of the visible spectrum has the shortest wavelengths; light on the highest end has the longest wavelengths. Since shorter wavelengths emit more energy, blue light is also known as High Energy Visible (HEV) light. This is what’s filtered out by blue light glasses.
What we see – the visible spectrum of light – consists of a range of colors, from blue-violet on the lower end to red on the higher end.
How are we exposed to HEV or blue light?
We all know the dangers of sun exposure. That glorious bright sunny day that most of us love is the primary culprit in blue light exposure. But even those who would rather stay indoors watching Netflix or playing video games are not safe from blue light because we're also exposed to "unnatural" blue light from our smartphones, TVs, computer screens, and artificial lighting. Although our digital devices emit only a fraction of the HEV light emitted from the sun, the number of hours we spend using our devices can have both an immediate and a cumulative effect on our health.
Should we be concerned about blue light exposure?
The short answer is yes. Blue light is a bit like salt, our bodies need it but our modern diet of processed food has us eating enough to make it harmful. So while exposure to blue light does have some positive benefits, our modern digital world has overexposed us to it. Blue light glasses help reduce harmful overexposure.
Eye Strain
Medical studies suggest that prolonged exposure to blue light may cause permanent damage to our eyes. We've all experienced digital eye strain from staring at a computer screen for long periods of time. And these days it's even more pronounced, as we spend a significant portion of our workday looking at our smartphones, tablets, computer screens. Even while relaxing, we play video games, read on a tablet, or watch TV. All of these activities expose us to artificial blue light.
How does blue light cause eye strain?
Our eyes are not built for our modern digital world. The eye's cornea and lens aren't good at filtering HEV light from reaching our retina, the thin layer of light-receiving tissue that lines the back of the eye. Over time, this can cause damage to its light-sensitive cells. As we age, this damage can make us more susceptible to eye diseases such as macular degeneration and cataracts. Young children are even more sensitive to blue light exposure since the lens of their eyes are even more transparent than adults, allowing more HEV light to pass through.
A scientific explanation is because High Energy Visible (HEV) light has such a short wavelength, it scatters in the eye, reducing contrast and making it difficult to focus. Over time, our eyes begin to feel tired. It can also cause pain in or around the eyes, blurred vision, headache, or sometimes even double vision.
Some helpful tips.
To protect your eyes and maintain a healthy sleep schedule, you should:
- Expose yourself to natural daylight
- Whenever possible, take frequent breaks from viewing devices
- Protect your eyes in daylight using sunglasses
- Avoid the use of digital devices right before bedtime
- Protect your eyes from excess artificial blue light with blue light blocking computer glasses
