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What Is Harmful Blue Light?

By Enter author here

April 15, 2016

You may have heard that as you step out into the sun, answer a text message or respond to emails, your eyes are exposed to light sources that emit Blue Light. But what exactly is Blue Light and are there good and bad forms of both? 

There are two types of blue light on the visible light spectrum – Beneficial Blue Light (or blue-turquoise light) and Harmful Blue Light (or blue-violet light)

Beneficial Blue Light is located at the 465-495nm range on the visible light spectrum, and is Blue-Turquoise in color.  Beneficial Blue Light helps regulate the Circadian sleep/wake cycle and is essential to pupil function and physical and emotional health.

Harmful Blue Light, located at the 415–455nm range on the visible light spectrum, is virtually everywhere  – indoors and out: computer screens, tablets, smart phones, gaming devices, LED TVs & LED lights, fluorescent lights, and of course from the sun. 

While Blue Light has always been present outdoors, the fact that we are living longer and our lifestyles are evolving means that we more exposed to Harmful Blue Light because we are spending more time indoors or on our electronic devices, which puts us more at risk for eye diseases. In fact, there is no known benefit associated with exposure to Harmful Blue Light and long term exposure has been linked to an increased risk of developing age-related macular degeneration (AMD1), the leading cause of blindness for adults over the age of 50.

In order to be at the forefront of creating products to meet the needs of today’s lifestyle – Essilor has developed a feature to help reduce Harmful Blue Light. This protection can be found in select Essilor products like Varilux Digital, Eyezen+ and Transitions lenses, and are available to you at no additional cost.

When these products are combined with Crizal No-Glare Lens treatments, you will receive comprehensive eye protection.

To learn more about Essilor’s solutions to Harmful Blue Light, visit


1 Arnault E, Barrau C, Nanteau C, Gondouin P, Bigot K, et al. (2013). Phototoxic Action Spectrum on a Retinal Pigment Epithelium Model of Age-Related Macular Degeneration Exposed to Sunlight Normalized Conditions. PLoS ONE 8(8): e71398. doi:10.1371/journal.pone.0071398 (August 23,2013).