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The harm and protection of blue light

Posting time:2022-12-03 09:11:13

The harm and protection of blue light

Hazards and protection of blue light

1. What is blue light with a wavelength of 380-495nm is visible blue light, and in visible blue light, blue light with a wavelength of 415-455nm is called Harmful blue light, these blue light have short wavelengths and high energy. Spectrogram 2. Source of blue light We are exposed to a large amount of blue light in our daily life, which exists in electronic products such as LED lights, computer monitors, mobile phones, and LCD TVs. Where does blue light exist 3. Harm of blue light (1) Cause cataract and macular degeneration. Blue light can penetrate the lens to reach the retina, causing optical damage to it, accelerating the oxidation of cells in the macular region, producing a large number of free radicals, and causing cataracts and macular degeneration. Of course, these effects are a cumulative process, and will not appear immediately. Research on the harm of blue light to the eyes has shown that the degree of harm of blue light to the eyes also varies according to age. The pupils of two-year-old children become smaller, and the damage rate of blue light products to the macula is 70%--80%. The pupils of children between two and six years old are smaller, and the damage rate of blue-light products to the macula is 60%--70 %, the damage rate of blue light to the macula of people over 60 years old is 20%. Therefore, parents should strictly control the time that children watch TV and use mobile phones. (2) It affects people's sleep. Blue light can inhibit the secretion of melatonin, and melatonin can promote people's sleep. If you play mobile phones or tablets before going to bed, it will lead to poor sleep quality and difficulty falling asleep. 4. How to reduce the damage of blue light to the eyes Wearing anti-blue light glasses is the most convenient and simple way. Anti-blue light glasses mainly reflect the harmful blue light of 415nm-455nm through the lens surface coating, which reduces the damage of harmful blue light to the eyes, and is suitable for people who work next to the computer for a long time. 5. How to identify anti-blue light lenses (1) Irradiate the lens with a blue light pen to see if it can block blue light. Those that can block blue light are anti-blue light lenses, and those that cannot block blue light are non-blue light-proof lenses. As you can see from the picture below, the lens on the left can block blue light, while the lens on the right can't at all. Comparison between anti-blue light glasses and non-blue light glasses (2) Anti-blue light glasses look more yellow, because some harmful blue light is filtered, the spectrum accepted by the eyes is incomplete compared with the natural spectrum, so there will be chromatic aberration. (3) The surface of the lens can reflect blue light, because the surface of the lens is coated with a reflective film, which can reflect blue light, and the lens without anti-blue light coating will not have this phenomenon.

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