The retina of the human eye does not handle blue light well. Doctor Sliney states that blue light sends an extremely intense signal to the muscles of the eye telling them to shut down. It can cause severe headaches and nausea. Intense blue light is also capable of causing permanent photochemical damage to the eye. The LED lights, whether white, blue, infrared or ultraviolet, are very bright and can be intense enough to injure human eyes.
Various chemicals in the eye such as xanthophyll, catalase and melanin guard against harmful blue LED light damage. The lens of the eye takes on a yellowish hue as the body ages, which also counteracts these harmful effects. However, since these defenses can weaken over time, the best course of action is to avoid exposure in the first place.
Although the retina of the human eye has many built-in defenses against damaging light, such as protective chemicals, a risk of permanent damage exists from exposure to blue LED light.