What is blue light?

　　Sunlight contains red, orange, yellow, green, cyan, blue, purple light, and many shades of each of these colors, depending on the energy and wavelength of each light (also known as electromagnetic radiation). In combination with this colored light, we call it "white light" or sunlight. There is an inverse relationship between the wavelength of light and the energy they contain. Light with a relatively long wavelength contains less energy, while light with a shorter wavelength has more energy.

　　Blue light refers to light having a wavelength between 400 nm and 500 nm; before 400 nm, it is violet light (10 nm to 400 nm), and between 500 nm and 760 nm, the wavelengths are red, orange, yellow, green, and blue. The blue light is further decomposed into blue-violet light (about 400 to 450 nm) and blue-green light (about 450 to 500 nm). Therefore, approximately one-third of the visible light is considered to be high energy visible light (HEV) or "blue" light.

　　What is blue light hazard?

　　Like ultraviolet light, visible blue light has the shortest wavelength and the highest energy visible portion of the spectrum. It's worth noting that the display screens of computers, electronic notebooks, smart phones and other digital devices emit a lot of blue light. However, the time people spend on these devices far exceeds our imagination.

　　The cornea and lens of the adult eye are effective in preventing UV rays from reaching the photosensitive web at the back of the eye. Even if you don't wear sunglasses, less than 1% of the UV radiation reaches the retina. But almost all visible blue light can pass through the cornea and lens and reach the retina. Laboratory studies have shown that excessive blue light damage can damage our body, as shown in the following aspects.

　　Causes dry eyes: Under normal circumstances, we blink 16-20 times per minute, while watching mobile phones, only 6-8 times per minute. The electromagnetic wave, ultraviolet light, radiation, glare color and infrared rays of the mobile phone screen can also irritate the eyes. It strongly flickers, causing the photosensitive material on the retina of the eye to consume too much purple matter, causing dry eyes, fatigue, and ghosting. Blurred vision, severe cases will lead to cornea, conjunctival epithelial cells sequential keratinization, lacrimal gland secretion cells also occur lesions, dry eyes are afraid of light, do not dare to blink. If the disease develops rapidly, it can cause corneal perforation within a few weeks, leading to blindness.

　　It is easy to cause blurred vision: Looking at the monitor screen, the light emitted by the screen will make the eye muscles fatigue, affect the focusing ability, and cause blurred vision. Initially it may be temporary visual fatigue, but in the long run it will become permanent, eventually leading to myopia, and may even lead to astigmatism! In the long run, one month will cause visual bias in the left and right eyes, and the oppression of the eyes will result in insufficient blood supply. Eyes will have a sense of expansion, short-term image overlap, this is not a drop of eye drops can be good! Some people with glasses are not the same degree.

　　Conjunctivitis: Staring at the monitor screen for a long time can cause damage to the conjunctiva of the eye. Because it maintains a fixed posture for a long time, it is easy to make blood flow to the eyes, resulting in mild congestion of the conjunctival blood vessels, and the sacral conjunctiva is also prone to mild nipple hyperplasia and follicle formation. At first, there may be a phenomenon of flushing, moistness, and crusting of the ankle (eyes). If not noticed, it may induce chronic inflammatory lesions of the conjunctival tissue, causing chronic conjunctivitis.

　　Injury to the skin: Watching TV, notebooks, computers, and mobile phones in the middle of the night is extremely serious. The night is the weakest moment of immunity. The normal rest will have a great impact on the skin, and it is easy to grow acne. In addition, the blue light on the screen can stimulate brown pigment, which is an important cause of yellow spots and freckles on the skin.

　　Inhibition of melatonin secretion, which affects the quality of sleep: blue light can inhibit the production of melatonin. Melatonin is a hormone that is produced from the pineal gland of the brain in the dark, at night. Its function is mainly to lower our blood pressure, glucose, body temperature at night, so that we can have a full and comfortable sleep. Researchers at Harvard University have found that using 2 hours of electronic products with a backlit display before going to bed can cause melatonin to be inhibited by 22%, causing sleep problems such as reduced sleep time and easy interruption. Sleeping at the same time is also more sleepy than people who have less exposure to blue light before going to bed.

　　Causes myopia in children: During childhood, the eyeball is still developing and the axis of the eye is still prolonging. At this time, looking at the monitor screen for a long time will cause the ciliary muscle spasm and the axial length to prolong, eventually causing myopia.

　　Impact on blood lipids and obesity: Research published in the American Journal of Epidemiology in 2014 showed that devices that emit blue light, such as smartphones, tablets and laptop devices, can activate areas of the brain that regulate appetite and metabolism. It turns out that the blue light signal received by the retina is transmitted to the brain, and the brain thinks that daytime has begun and the body needs to replenish energy. Even if the dinner is normal that night, hunger can still eat extra food and snacks, leading to weight gain. When you face your phone and computer for more than 3 hours at night, your body will start to feel hungry.

　　People become depressed and children are more susceptible: a study in the journal Molecular Psychiatry used hamsters for experiments. In the evening, they illuminate them with dim light. After 4 weeks, the hamster lacks energy and is not active. It shows symptoms of depression. For example, the sugar that I usually like to drink now doesn't like to drink. For the human body, blue light can cause abnormal release of hormone cortisol. During the day, the cortisol content in our blood will be higher, to balance our daytime activities and adjust the immune system; at night, under normal circumstances, the content should be reduced, but the light and screen light will cause abnormal release. Cortisol, while his level is too high, will reduce the amount of serotonin that provides a sense of calm and happiness, prone to anxiety symptoms.

　　The anti-blue film can help people effectively block blue light and solve a series of problems caused by blue light. In fact, many products on the market with anti-blue light, most of them can not prevent blue light, just a gimmick. How to determine whether an anti-blue film is really anti-blue light? First of all, you can look at the anti-blue light effect and effect from the anti-blue light test report. The most important thing is to see if the product can produce an internationally recognized test report SGS report. !

　　First, let's take a look at the YIPI anti-blue film spectrum.

　　1. See if the wavelength of the barrier is between 400nm and 500nm, because the light in this interval is blue light, and not in this range can not be called blue light. The light before 400nm is purple light. Most products say that blocking blue light actually refers to the purple light area, which is useless.

　　2. Look at the spectral curve: See if the peak of the high-energy short-wave blue region from 420nm to 450nm is reduced? After comparison, it is clear at a glance. This area reduction is effective. From the spectrogram of the screen, the high-energy short-wave blue light of the display screen is mostly distributed between 420nm and 450nm, and this peak is the highest.

　　3. Look at the spectrum of other light waves except the blue wavelength. If the peaks of other wavelengths are also reduced due to the blue light drop, the screen transmittance will usually be affected and the color of the screen will be a little worse.

　　The YIPI SGS report on acrylic anti-blue film

　　After more than 10 years of efforts, theYIPI has developed an acrylic anti-blue protective film, which is a new functional screen protection film developed for blue light radiation, mainly through the use of eyeo2 nano anti-blue light technology to absorb the blue light emitted by the LED screen. And transformation, to achieve a barrier to blue light, thus protecting eye health. This product uses pure Japanese imported materials, which can effectively block the blue light emitted by the screen and other harmful light to the eyes and skin, prevent myopia, acne, long spots, and have the functions of radiation protection, ultraviolet ray and anti-glare. The main features of the new acrylic anti-blue film:

　　1. Anti-Blu-ray: Prevents 420um to 480um high-energy short-wave blue light damage to the eyes, anti-glare, reduce reflection, clear vision, protect both eyes, and reduce the effect of blue light on skin melanin;

　　2. Anti-bacteria: silver nano-coating, the sterilization rate reaches 99%, effectively protecting the health and safety of users;

　　3. Anti-shock: the hardness reaches 5H, which can effectively prevent accidental drops, collisions, and damage to the screen caused by rolling;

　　4. Anti-scratch: protect the screen of the mobile phone or tablet from scratching and leaving marks;

　　5. High light transmission: the screen is still clear and clear after filming;

　　6. Using 2MM acrylic material, the color reproduction is extremely high, after the film is attached, it does not affect the screen vision, 93% high transmittance, enjoy the naked eye HD experience.

　　7. Replace the computer with the phone at any time to avoid the heat dissipation problem caused by the radiation, and solve the effect of the refraction on the display effect. The one-piece frameless design does not affect the appearance of the display and will not scratch the display.