What is the Harm of Blue Light and the Working Principle of Blue Light Glasses?

Anti blue light glasses are no longer an unfamiliar item for many people, so what is blue light and why should we wear blue light glasses? This article will discuss it in detail.

1. What is Blue Light Radiation?

First of all, the blue light we are talking about here refers to high-energy shortwave blue light. High-energy shortwave blue light is light with a relatively high energy wavelength between 400nm-450nm. Here, it is particularly pointed out that blue light is not all harmful, the real harmful blue light is shortwave blue light within 400 to 440 or 450 nanometers, and blue light between 450 to 500 nanometers has a role in adjusting biological rhythms. Sleep, mood , memory, etc. are all related to it, it is beneficial to the human body.

And whether shortwave blue light will definitely cause damage to human eyes, this is related to the intensity of the irradiation and the irradiation time. When the illuminance reaches a certain level, it lasts for more than two hours before it may damage the retina.

2. Which Occasions in Life Have Harmful Blue Light Radiation?

Blue light can be seen everywhere in daily life, but the main source of harmful blue light is the LED LCD screen.

Today's LCD screens are all LED backlight. Since the backlight requires the effect of white light, the industry uses blue LEDs mixed with yellow phosphors to form white light. Since the blue LED is a main body hardware, the blue spectrum of this white light has a peak, which causes the problem of harmful blue light hurting the eyes.

Our current lives are full of LED LCD screens, such as computers. This is the most important source of blue light threats faced by office workers, followed by mobile phones. Especially with the rise of smart phones, blue light radiation targets also extend from office workers to homes. This phenomenon is getting worse.

3. Can Anti-blue Glasses Really Protect the Eyes? How Does It Work?

First of all, the answer is yes. Blue light blocking glasses can effectively block harmful blue light from entering the fundus of the eyes, greatly alleviating eye fatigue and other eye discomfort symptoms. Of course, the anti-blue glasses we are talking about mainly refer to blue block lens.

At present, anti blue light lenses are divided into two types: reflective anti-blue light lenses and absorptive anti-blue light lenses.

Reflective anti-blue light lenses the lenses coated with a film that reflects harmful blue light. The anti-blue light film will have a faint yellow color, so that the light on the screen will be soft and the lens looks transparent.

Absorptive anti-blue light lenses is the lenses added with materials during the production of the substrate. The lens material absorbs harmful blue light. Such lenses have a background color, which is very light yellow.

These two methods have their own advantages, but both blue light lenses have the effect of reducing harmful blue light. The anti-blue lens is not the best for all prevention, nor is it the best for all-weather use. In fact, the anti blue glare glasses should be called special glasses used for electronic products, and it is not necessary to wear anti-blue lenses outdoors. It is enough to reduce the blue light by about 30%, which not only filters the shortwave blue light, but also retains the existence of the beneficial blue light.

Of course, if we want to better prevent the eye problems caused by blue light, we should establish a correct understanding, whether it is for ourselves or our children, we should take correct and effective preventive measures:

1) Arrange online time reasonably and cultivate good living habits.

2) Reasonably adjust the dietary structure to enhance the body's immunity

3)Choose more foods containing lutein and vitamin C.

4) Turn down the brightness and warm the color temperature when surfing the Internet or watching TV

5) Reduce online time, especially avoid staring at your phone or monitor in the dark

6) Do more outdoor sports, which can effectively enhance eye adjustment.