Blue light mainly abounds in LED lamps, computer monitors, cellphones, digital products, liquid crystal display, bath heater, and so on. Blue light is very harmful to human eyes. It can increase the amount of toxin in the macular region of the eyes, and aggravate the macular disease such as macular degeneration. Blue light can also reach the retina and injure the retinal pigment epithelium, leading to fundus injury after a cataracts surgery. It can cuase blurry vision, eye fatigue, and VDT syndromes, because the blue light can aggravate the aberration and the visual ambiguity, which makes the optic muscles and the blood supply in the eyes too hypertense, aggravating eye fatigue. In addition, blue light possesses quite high energy, thus it has high rate of scattering when meeting the small particles in the air, which can easily makes the eyes feel dazzling and uncomfortable. Therefore, people should stay away from blue light as possible as they can, or use blue light as less as they can, and put on protective eyewear if possible when they are in environment of blue light.
