Lenses To Protect Your Eyes From Harmful Blue Light
How does blue light affect our sight?
Most of us think of light as the absence of darkness; light is either present or absent, either natural or from a man-made source. While none of that is incorrect, there is actually much more to light than (pardon the pun) meets the eye.
What is blue light?
For the purposes of this article, we’ll focus on blue light, one of the many hues in all visible light.
Blue light is naturally produced by the sun but also by computer monitors, smartphone screens and other digital devices. In addition to these, blue light is produced by LED and fluorescent lights, and compact fluorescent light bulbs. Blue light is essential in maintaining your sleep and wake cycle, mood and keeping your memory sharp.
Why we need blue light lenses or glasses?
- Blue light is everywhere - While man-made sources of blue light include fluorescent and LED lighting, flat-screen televisions, and the display screens of computers, electronic notebooks, smartphones and other digital devices; our main source of blue light is the sun, and we are most exposed to it when we are outdoors during daylight hours. This is where the most damage occurs and our children are also vulnerable to it since they are more likely to spend a significant amount of time outdoors whether at school or in the playing field.
- Natural blockers are ineffective - While the cornea and lens of the eye are effective at blocking UV rays from reaching our light-sensitive retinas, almost all visible blue light passes through these barriers, which could reach and damage the delicate retina.
- Increased risk of macular degeneration – Because blue light may reach and contribute to damage the light-sensitive cells in the retina, while being more and more exposed, this may be one more important contributing factor to permanent vision loss.
- Increased vulnerability post cataract surgery – Always ask your surgeon what type of intra-ocular lens (IOL) will be used to replace your cloudy natural lens, and how much harmful blue light protection that lens provides. You may also benefit from glasses that have lenses with a special blue light filter, which contributes to reduce eye strain from staring at screens for too long.
- It contributes to digital eye strain – While this is less dangerous than the effects of the blue light generated by the sun, digital eye strain is something we are all at risk of. Most people spend at least 12 hours a day in front of a screen, though it takes as little as two hours to cause digital eye strain. Dry eyes, eye strain, headaches and tired eyes are all common results of staring at screens for too long. Blue light exposure from computers and other digital devices can be reduced with special computer glasses.
It’s not all bad news
You are about to hear a fair number of cons about blue light, but it’s important to remember the pros as well. For example, some degree of blue light exposure is necessary for our overall well being. Research shows that blue light regulates circadian rhythm (the body’s wakefulness and sleep cycle), aids memory and cognitive function, boosts alertness, and can improve your mood.
How do I choose the right blue light lenses?
For indoor usage
We can’t seem to escape blue light even if we’re indoors with all the windows shut, because chances we’re sitting in front of a computer, TV, or using our smartphone. For those who spend the majority of their time indoors, computer glasses like Eyezen™ protect your eyes from extended exposure to blue light and help relax your vision, reducing digital eye strain.
For the outdoors
Ultimately though, we need to go back to the fact that the blue light generated by the sun is by far the strongest and most likely to do us harm, so simply protecting our eyes against man-made sources isn’t enough.
For protection, it is necessary to use lens coatings to filter out the harmful blue light and let in the good. This will ensure constant protection for your eyes without affecting your vision at all.
Clear protective lens coatings like Crizal®, are perfect for indoor and outdoor use, making it a convenient solution to the harmful blue light.
For both indoor and outdoors
Another effective method is to use photochromic lenses that are clear in low light conditions but darken as the light increases. Transitions™ lenses offer optimal protection from harmful UV rays from both the sun and blue light from digital devices and house lights.
These glasses are suitable for wearers of all ages, a clear advantage especially with children under the age of 12 who are more vulnerable to sun damage due to the fact that their eyes’ natural protective barriers are still underdeveloped.
Spending a lot of time in front of digital screens?
Ask your optometrist about lenses that protect your eyes against harmful blue light.