Blue Light in Displays and Lighting
In natural outdoor sunshine, blue light peaks at 480 nm. This stimulates photosensitive Retinal Ganglia Cell (pRGC) in humans’ eyes to synchronize daily circadian physiological rhythms to the light and dark cycles. Unfortunately, displays, such as laptops, monitors and cell phones, typically emit with a peak blue wavelength of 435 nm. At this level, blue light oxidizes to A2E, a waste product stored in the retina. This can lead to dry eye macular degeneration in older adults. There is also a correlation between lack of outdoor lighting and myopia in humans. Read how spectroradiometers can be used to measure blue light.