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By selectively blocking harmful blue light and ultraviolet rays, Crizal® Prevencia™ No-Glare lenses help prevent the early occurrence of certain eye impairments and diseases.
What is Blue Light and Ultraviolet Light?
Blue light is part of the visible light spectrum and is emitted by the sun and artificial light sources such as LEDs, computers, and smart phones. Some types of blue light can be beneficial and help regulate our bodies’ internal biological clocks. However, blue-violet light can have a harmful impact on the eyes, specifically the retina. It is also a risk factor for the onset of age-related macular degeneration, a deterioration of the part of the retina responsible for sharp, central vision.
Ultraviolet light not only affects the skin by increasing the risk of skin cancer, it can also be dangerous for the eyes. Excessive exposure to UV light without proper protection can lead to cataracts. It can also cause a sunburn on the cornea of the eye (known as photokeratitis), which can lead to temporary blindness.
How It Works
Since some forms of blue light are necessary, Crizal Prevencia No-Glare lenses selectively block only the harmful types of blue light. New technology called Light Scan™ allows beneficial blue light to pass through the lens while filtering out the dangerous blue-violet light that can cause age-related macular degeneration.
To protect against UV rays, Crizal Prevencia No-Glare lenses offer an Eye-Sun Protection Factor (E-SPF®) of 25. This means the lenses protect your eyes from harmful UV rays 25 times more than if you weren’t wearing glasses at all.
Do You Need Protection against Blue and UV Lights?
Blue light is emitted by a plethora of electronic devices including cell phones, tablets, and laptop computers. A recent studyfound that Americans spend almost 2 ½ hours on their tablets and smart phones every day, meaning protection against blue light is important for anyone using a digital device on a regular basis. Another source of blue light is energy efficient technology in the form of fluorescent light bulbs and LED lights. Most offices and stores use fluorescent light bulbs, thus putting your eyes at risk if unprotected.
It’s important to protect your eyes against UV exposure both indoors and out. Our eyes are exposed to UV radiation 365 days a year, even on cloudy days. In fact, up to 40% of UV exposure occurs when we aren’t in full sunlight. Crizal Prevencia No-Glare lenses protect your eyes against UV rays from the sun, but also from UV rays that can travel indoors through windows. This is especially dangerous for people who spend a lot of time in their car or near windows in their home or office.
Since most people are at risk for overexposure to both blue light and UV light on a daily basis, it’s important to talk your Optometrist about Crizal Prevencia No-Glare lenses that can protect your eyes from harmful blue light and ultraviolet light.