CPF Circadian Protection Factor
CIRCADIAN PROTECTION FACTOR (CPF) FOR SCREEN PROTECTION
CPF is a metric used to quantify the amount of circadian stimulus reduction provided by a screen protector. The CPF scale ranges from CPF20 to CPF80, with higher numbers indicating greater blue light protection. measures the effect of blue light emission on circadian rhythm. Higher CPF numbers indicate that a device offers better protection against circadian disruption.
CPF was developed in collaboration with doctors and healthcare leaders to offer a clear, standardized measure of blue light reduction within the range of 480-500 nm, the blue light range shown to be the most disruptive to sleep.2 CPF enhances consumer confidence and helps individuals easily compare different products.
CPF for Accessory will be third-party verified and may be used for marketing purposes with permission from Eyesafe.
CIRCADIAN PROTECTION FACTOR (CPF) FOR DISPLAY
CPF designates the level of circadian stimulus reduction in digital displays. The CPF scale measures the effect of blue light emission on circadian rhythm. Higher CPF numbers indicate that a device offers better protection against circadian disruption. Based on research, third- party verified, and supported by leaders in the eye care community.
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1. The blue light range between 480-500 nm is identified as the wavelengths most disruptive to sleep by CIE S 026/E:2018
2. American National Standards Institute (ANSI) Z80.3 and the International Commission on Non-Ionizing Radiation Protection (ICNIRP) Guidelines define the peak toxic hazard region of the blue spectrum as 435-440 nm. CIE S 026:2018 CIE System for Metrology of Optical Radiation for ipRGC-Influenced Responses to Light. International Standard. (2018). 10.25039/S026.2018 identifies 480-500 nm as the range that has the most impact on circadian rhythm.
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