Do Your Glasses Block Blue Light?

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.

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.

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.