The wavelength of blue light is between 400 and 500 nanometers, which is the shortest among visible lights. The shorter the wavelength, the stronger the energy and the greater the penetrating power. So blue light has the strongest energy among visible light!
In daily life, blue light is actually everywhere. In addition to the blue light in sunlight, over the past two decades, LED lights and LED electronic screens have developed rapidly, exposing us to an increasing amount of "artificial" blue light.
Not all blue light is harmful to the eyes. Don't dismiss it outright. Blue light can be both good and bad. We don't mean to block all blue light.
The wavelength of blue light is between 400 and 500 nanometers. If simply classified, the shorter the wavelength of blue light within this range, the more harmful it is. They are high-energy short-wave blue light, known as harmful blue light. The main source in daily life is LED display screens.
Beneficial blue light, on the other hand, plays a positive role in regulating the biological clock, forming night vision, and promoting vision development.
Blue light has high energy and strong penetrating power. Some of the blue light can penetrate the lens and reach the retina directly. The damage of high-energy blue light to the retina has been confirmed by animal experiments. Recent studies have also confirmed that under a certain period of direct exposure to blue light and intensity, the vitality of retinal cells significantly decreases or even leads to apoptosis.
Fortunately, with qualified LED products, the intensity of blue light in daily life has not yet reached a level that seriously damages the retina. So, normal people actually don't need to worry too much.
However, patients who have undergone cataract surgery, due to the lack of the lens's filtering effect on blue light, need to wear anti-blue light glasses to protect the fundus. Patients with retinal diseases may be more sensitive to blue light themselves. It is recommended that they also take protective measures against blue light.
2. Pay more attention to fatigue and blurred vision
Blue light has a short wavelength and high energy. When it encounters an uneven medium, it is more prone to scattering. When blue light scatters in the eyes, it is easy to form glare and focus in front of the retina, causing blurred vision and visual fatigue. So, reading e-books is often more tiring than reading paper books.
3. Aggravate dry eyes
Why do we tend to feel dry eyes after looking at screens for a long time? Apart from reasons such as prolonged eye use and reduced blinking frequency, blue light also plays a role. Studies have confirmed that blue light can cause changes in the tear film on the eye surface and also damage corneal epithelial cells, exacerbating dry eyes.
4. Affect sleep
Studies show that people who use electronic products before going to bed take longer to fall asleep because the electronic screens constantly emit short-wave blue light. Blue light can inhibit the secretion of melatonin, reducing your sleepiness, affecting sleep duration and quality, and disrupting the normal biological clock in your body. This is the reason why I feel less and less sleepy when playing with my phone at night.
Friends who have a high prescription of glasses and often wear them can choose anti-blue light lenses when getting their glasses fitted. Not only when using mobile phones, but also in scenarios where we stare at monitors, tablet screens, etc., anti-blue light lenses can help us effectively resist blue light and prevent further increase in eye vision.
Most people like "cold screens". The colder the color, the higher the blue content in the pigment. A large amount of blue light is more likely to cause damage to the eyes. Therefore, we can choose to lower the color temperature of our mobile phones. Such a setting is more conducive to protecting our fragile retinas. It should be noted that the brightness should not be set too low; otherwise, it will be more likely to harm the eyes.
