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.

Details that need to be paid attention to in fitting:

1. Parameters are mainly used in recent times

Because they are mainly near-use glasses, the prescription for optometry should take this into consideration, and the corrective vision should be appropriately reduced in optometry, so as not to cause eye discomfort for a long time. The specific optometry prescription must be obtained by a professional optometrist through rigorous optometry.

2. Qualified optical lens

1. The anti-blue light lens must first be a qualified optical lens, and must have a certain percentage of anti-blue light effect. The general anti-blue light optical lens is about 30%. Not all blue light is harmful to the human body, about 30% is a recognized harmful indicator, and the rest is beneficial light. It is recommended to choose lenses from major brand lens manufacturers.

Secondly, there are two types of anti-blue light lenses. One type is light orange lenses colored on the substrate, such as GUNNAR. This type of lens has a darker background and is not suitable for long-term wear. Mainly flat lenses. The other type is realized by the surface film layer, the background color is lighter, and there is also a little light orange, which needs to be easier to see under the white background. From the effect point of view, the anti-blue light effect of these two types of lenses is not much different. But the latter's technology is more advanced, and the optical performance is generally superior.

Another point is that even for people who are not nearsighted, it is best to choose branded lenses from reliable optical lens manufacturers. Choose the finished zero-power glasses carefully, and it is best to prepare the lenses separately. The quality of the lenses is an important key to ensure the wearing comfort and effect.

3. Be cautious about market noise

Those who claim to have the "eye protection" function and advocate how their anti-blue light products are effective are all suspected of marketing bludgeoning.

Those who use a large number of pictures to threaten the harm of blue light are obviously suspected of amplifying the harm of blue light and blue light, so choose carefully.

Avoid talking about lens manufacturers or lenses from unknown lens factories that are not even known in the industry. Don't try it lightly. Marketing only needs to be thick-skinned and brave, but professional lens factories need more than ten years or even decades of accumulation. Don't be blinded by dazzling pictures and brand images. At present, no eyewear retail company has the ability to develop professional lenses on a global scale. The biggest reason they launched their own brand is mostly because they don't want customers to compare prices.

4. Selection suggestions

 From the evaluation of lens technology and quality stability, brand recommendations: Essilor, TAG Heuer, Zeiss, Kemi.

 Anti-blue light lenses are only suitable for people who use computers and other electronic display devices for a long time, and are not suitable for patients with asthenopia symptoms.

 Daily wearing of anti-blue glasses does not affect them, but it does have a background color problem. It is best to go to the store to try on and confirm whether you can adapt before making a choice.

 Design workers are not recommended to wear anti-blue glasses, because chromatic aberration will affect the judgment of color, you can use other ways to protect your eyes. You can refer to other eye protection articles in the column.

The above are some of the issues that need to be paid attention to when choosing anti-blue glasses. Of course, in order to better protect your eyes in front of the computer, we need to prevent blue light at the same time, but also need to eat more vegetables, supplement lutein, multivitamins and zeaxanthin to strengthen the antioxidant capacity of the eyes, thereby protecting us s eyes.

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