As early as 1966, Nell et al. found that exposure to blue light can cause damage to retinal cells, leading to decreased or even lost vision. Among them, short-wave blue light with a wavelength between 400-450 nm has the greatest damage to the retina.
At the 2010 International Light Association Annual Meeting, the world's top optical experts unanimously pointed out that short-wave blue light has extremely high energy and can penetrate the lens to reach the retina. Blue light illuminates the retina to produce free radicals, which cause the retinal pigment epithelial cells to die. The decline of epithelial cells causes light-sensitive cells to lack nutrients and cause vision damage, and these damages are irreversible.
A study by German eye specialist Professor R. H. W. Funk pointed out that when "inappropriate light" continues to illuminate our eyes, it can also cause physical dysfunction.