Investigating the Science of Blue Light Protection

Do Your Glasses Block Blue Light?

About Us

With the combination of increasing human lifespan, and changes in modern lifestyles resulting in an unnatural distribution of artificial light exposure to our eyes, the importance of maintaining eye health is a growing issue. Our mission is to empower consumers with information and tools to understand and verify claims of blue light protection in the marketplace, so they can make informed decisions.

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The Science of Blue Light

Types of Blue Light

Short Wavelength Blue Light (390 - 420 nanometers)

This light has the highest frequency, and therefore also has the greatest danger to the eyes. Short wavelength blue light is sometimes called "HEV Light" which stands for "High Energy Visible Light". Short wavelength blue light appears to have a "blue-violet" color. Our eyes have extremely low sensitivity to short wavelength blue light. The primary environmental source of short wavelength blue light is from sunlight.

Medium Wavelength Blue Light (430 - 460 nanometers):

This portion of blue light has a medium frequency range, and is a cause for some concern to human health primarily due to disruption of circadian rhythms if we are over-exposed to medium-wavelength blue light at night. This light has a "pure blue" color. Significant amounts of medium wavelength blue light are emitted by LED lights and digital devices. It is also a strong component of sunlight, especially during the middle of the day.

Long Wavelength Blue Light (470-510 nanometers)

This portion of blue light has the lowest frequency, and therefore the lowest danger to eye health and is generally not considered a significant hazard under most conditions. Long wavelength blue light appears to have a "blueish green" color or "cyan" appearance. Exposure to long wavelength blue light sends a powerful alerting signal to the human circadian system and helps with synchronizing your body's energetic processes with the the cycle of day and night.

High Frequency

Blue light has the highest frequency in the visible spectrum. Therefore, individual photons of blue light carry more energy per photon compared other colors of visible light.

Ionization Potential

Due to the high frequency, each photon of blue light has elevated potential to cause ionization (displacement of electrons) when it strikes biological tissue, damaging DNA and cells.

Low Visibility

The human eye has low sensitivity to blue light causing it to appear dim. Therefore, the normal light aversion reflex is insufficient to protect the eyes from blue light exposure.

Types of Blue Light Blocking Eyewear

Short-Wavelength Blocking

These lenses look clear indoors, but have a slight yellow tint outdoors. Short-wave blue is primarily found in sunlight, which can be a long term risk to retinal health.

Medium Wavelength Blocking

These lenses have a yellow or orange tint, and can help protect the human circadian system from exposure to excess blue light at night-time from digital devices and indoor lighting.

Long Wavelength Blocking

These lenses have a deep red tint and are mainly used for certain low vision disorders, and by night shift workers who need to fully block out circadian-stimulation during the day.