Blue light is a color that is also found within natural light. However, its wavelength is extremely close to ultra-violet rays, which are harmful to the eyes and body, and it also has a high amount of energy. Hence, it is said that blue light is able to pass the cornea and crystalline lens of the eye without being absorbed, and can end up reaching the retina, which can cause it to deteriorate. There also concerns that exposure to blue light for long periods of time can have a detrimental effect on the eyes.