The dangers of blue light exposure at home

Blue light has certain harmful effects on human health. Especially in recent years, with the development of science and technology, more and more electronic devices have entered people's lives, such as computers, mobile phones, readers, etc., which are relatively common household electronic devices. If these devices are used frequently, the harm to the body is relatively large, especially the impact on vision. Let us learn about this aspect.

It is well known that lack of sleep can contribute to heart disease, obesity and type 2 diabetes. Lack of sleep can also cause anxiety and depression. Some scientists also believe that blue light is related to age-related macular degeneration, but there is no conclusive evidence.

Long-term exposure to blue light can also induce cataracts and even blindness.

According to scientists' statistics over the years, the age of onset of cataracts is highly positively correlated with ultraviolet rays. The average age of onset of cataracts in the equatorial region is 5 to 10 years earlier than that in high-latitude regions.

We know that the wavelength ranges of ultraviolet (UV) and blue light are relatively close. The peak wavelength that damages the eyes is around 440nm, while the peak wavelength that suppresses melatonin is at 460nm.

Studies have shown that LED lights inhibit the secretion of melatonin in 99% of people and shorten the duration of melatonin by 90 minutes. For a long time, people used incandescent light bulbs, which rarely emit blue light. Today's LEDs are rich in blue light.

But at least we turn off the lights when we go to bed, and LED lights are much farther away from us than mobile phone screens. This is why people are more concerned about the hazards of blue light from smartphones and tablets.

Blue light is harmful only at night

By far, the most blue light that the average person is exposed to comes from the sun, making it harder for us to get a good night's sleep during the day. But during the day, blue light has no side effects. On the contrary, we need blue light.

When we wake up in the morning, we need sunlight to reset our body clock. In addition to avoiding blue light at night, getting 15 minutes of sunlight in the morning is just as important for your biorhythm.

Of course, at the end of the day, avoid blue light exposure, especially 90 minutes before bed. The problem is, turning off all the lights and sitting in a dark room every night is just too unrealistic.

There are many blue light filtering glasses or films on the market. These lenses or films have a special coating, and their main working principle is to absorb or reflect blue light. For example, as introduced before. It can filter light with a wavelength of 400-440 nanometers, while other wavelengths of light are not affected.