Are anti-blue glasses really useful?
Blue light with wavelength within 440~470nm
May be harmful to the retina
How harmful? The specific reference is as follows
In 2014, the Vision Health Laboratory of the China National Institute of Standardization and Wenzhou Medical University conducted a blue light retinal damage study. When the blue peak spectrum of blue light is 460-500 nanometers, the illuminance exceeds 1500lx, and the retinal cells are directly irradiated for more than 3 hours, the cell viability will be obvious. Decline and apoptosis.
1. Eye injury: Harmful blue light has extremely high energy and can penetrate the lens directly to the retina, causing the atrophy or even death of retinal pigment epithelial cells. The death of light-sensitive cells will result in decreased vision or even complete loss of vision. This damage is irreversible. Blue light can also cause macular degeneration. The lens of the human eye will absorb part of the blue light and gradually become cloudy to form cataracts, and most of the blue light will penetrate the lens, especially children's lenses are clearer and cannot effectively resist the blue light, which is more likely to cause macular degeneration and cataracts.
2. Asthenopia: Due to the short wavelength of blue light, the focus point does not fall on the center of the retina, but a bit farther from the retina. To see clearly, the eyeballs will be in a state of tension for a long time, causing visual fatigue. Long-term visual fatigue may lead to symptoms such as deepening of myopia, double vision, ease of reading when reading, and inability to concentrate, which affects people’s learning and work efficiency.
3. Poor sleep: Blue light can inhibit the secretion of melatonin, which is an important hormone that affects sleep. Its known role is to promote sleep and regulate jet lag. This can also explain why playing with a mobile phone or tablet before going to bed can cause poor sleep quality or even difficulty falling asleep.
For TVs, computers, PADs and mobile phones and other various LED light-emitting display devices, manufacturers often increase the blue light intensity of LED backlights in order to make their picture quality more bright and beautiful. With the popularity of these electronic products and permeate all aspects of life, Everyone's exposure to blue light has increased dramatically. For ordinary people, blocking blue light for a long time is the most effective way to reduce damage, and the use of anti-blue glasses can effectively solve this.
The real role of anti-blue lenses:
For people who use computers or electronic display devices for a long time, the effect of anti-blue light lenses can certainly block some harmful blue light damage to the eyes, making the eyes more comfortable when working in front of the computer screen. However, there is no further evidence to prove that it can effectively improve the effects of eye soreness, dry eyes, decreased vision, and fundus diseases. Therefore, be cautious of those exaggerated marketing advertisements in the market.