HOW TO BLOCK BLUE LIGHT
Dr. Jim Martin 03/30/2016
Understanding The Sources Of Blue LightBefore you can block blue light, you need to understand the many sources from which it emanates. Here is a partial list of blue light sources:
- Sun - The electromagnetic waves emitted by the sun cover a wide spectrum, only a small part of which humans can see with the naked eye. Blue light in on the shorter end of the visible light spectrum. It is most prominent during the mornings and early afternoon.
- Televisions - The light that comes out of a television is saturated with blue light. This gives it the clear, crisp picture that consumers expect.
- Smart phones, tablets, and computers - The screens on these devices emit a large amount of blue light, much like the screens of televisions.
- Light bulbs - Old incandescent bulbs tended to emit light closer to the red-end of the visible light spectrum. Newer CFLs and LED bulbs emit light closer to the blue-end of the spectrum.
Sunlight is something that your body needs. But, exposure to too much blue light, especially after dark can damage the retina. That is what you need to block.
How Do You Block Blue Light?
Turning out all the lights and shutting down the TVs and computers is the best way of preventing blue light damage. However, living in today's world makes this difficult to achieve. So, what are the options?
Eyeglasses that block the harmful blue light wavelengths are becoming available in multiple types of lenses. Crizal Prevencia lenses are a great example of this kind of lens. They provide an anti-glare shield that filters out blue light specifically. To the naked eye, they appear to be clear or have a slight violet tint. But, to the eyes behind them, they offer the protection needed to preserve vision.
Another example of a blue light blocking lens is the Essilor Eye Protect System. It uses a proprietary Smart Blue Filter built into the lens that provides protection against blue light waves. This filtering system is available in Varilux, Eyezen+, and Transitions lenses.
If you want to protect your eyes from the dangers of blue light, you need to consult an eye doctor who can examine your eyes and make recommendations on which lenses would work best. The doctors and opticians at Broome Optical can help you with any of your optical needs.