Do blue light glasses work?

Today is the era of information + Internet, and mobile phones and computers are an indispensable part of our lives. While high technology brings us convenience, it also brings harm to everyone. Long-term use of these electronic products will not only make the eyes tired, but also deepen myopia. In severe cases, it will cause headaches and insomnia. Therefore, blue light glasses have appeared on the market, which can relieve eye fatigue. So, do blue light glasses really work?

Electronic displays mainly emit blue light, and the human eye has a certain degree of adaptability to blue light.

"Blue light belongs to the range of visible light, with a wavelength between approximately 400 nanometers and 500 nanometers." Light in nature is composed of a spectrum of various colors. Different wavelengths appear different colors visually. The shorter the wavelength, the higher the energy. Short-wave blue light is light with higher energy.

Most of the light emitted by the display screens of lighting, mobile phones, computers and other products we use currently contains blue light. Data shows that unlike visible light which contains seven colors of light, namely red, orange, yellow, green, cyan, blue and violet, the light emitted by display screens made of LED and other materials used in electronic products is mainly red, green and blue, with blue light accounting for the majority.

Under normal circumstances, after evolution, human eyes have adapted to blue light. But in recent years, people's long-term use of electronic products has triggered concerns about whether blue light is harmful to the eyes. "Another reason people worry about blue light is the recent medical research on macular degeneration in the elderly." Because studies have shown that if blue light exposure time is too long, the macula of the human eye is prone to degeneration after the age of 50. Macular degeneration can weaken the function of the retinal pigment epithelium and even cause bleeding, leading to decreased central vision.

The macula is an important part of the eye. Whether blue light causes harm to it is a topic of concern in the medical community, but there is no conclusion yet.

There is no conclusive evidence of the effect on human eyes. Whether it hurts the eyes is related to the intensity and duration.

"It should be noted that the impact of blue light on the eyes needs to be considered in combination with two factors: illumination and time." Regular electronic products used in daily life have undergone strict standard testing. Most lamps have encapsulated light sources, and display screens mostly use backlight or side light displays. Their illumination is much smaller than the experimental data.

Although there are experimental data showing that blue light can damage the eyes, "currently, studies on the effects of blue light on photoreceptors and retinal cells are all based on experiments on animals and cultured cells. There is no evidence to show how much illumination and duration blue light needs to cause damage to living human eyes."

"The existence of blue light is reasonable." Simply filtering out blue light can easily cause a decrease in visual acuity for the elderly.