For a man with glasses
The biggest wish is
To be able to match one for yourself
And to the greatest extent
Glasses for eye protection
so,
It's on the market
All kinds of glasses with different functions
In recent years
The most popular is
Various blue light proof lenses
To protect against the "ubiquitous blue light hazard"
There are even posts on the Internet claiming that
Blue light can cause
Visual fatigue
Retinal injury
Maculopathy
Even blind
So is that the case?
Is blue light so harmful?
Can you avoid wearing blue light proof glasses?
today
Just say it for everyone
Is blue light really harmful to the eyes?
We call the light that the human eye can see visible light, and its wavelength range is 380nm-780nm. According to most national standards, the visible light with a wavelength range of 400nm-500nm is called blue light.
In visible light, blue light is the most sensitive and penetrating to retina. Theoretically, blue light may cause damage to some eye tissues. However, the following facts should be noted:
1、 The eye itself can block some blue light, and the retina also contains antioxidants that help filter blue light.
2、 Although people associate blue light with computers and mobile phones, the biggest source of blue light is sunlight. Other sources include fluorescent lights and LED lights. The blue light exposure on the screen is much less than the sun exposure.
3、 Dr. Khurana, a spokesman for the American eye Association, an authoritative organization, said that blue light can be exposed to computers, televisions, mobile phones and tablets, but there is no scientific evidence that the blue light emitted by digital devices can cause harm to the eyes.
Say in this way, since blue light is not harmful to the eyes, why do you have eye discomfort when you look at the screen for a long time? And look down~
Why does long time see a screen can eye discomfort?
Normally, humans blink about 15 times a minute. Research shows that when we use digital screen equipment, the number of blinks will be reduced by 1 / 2 ~ 2 / 3, and the reduction of blinks and close work will lead to eye fatigue.
Is it necessary to wear blue light proof glasses?
Anti blue light glasses are becoming more and more popular. Advertisements for these glasses claim that excessive exposure to blue light will cause a series of eye problems, such as dry eyes, visual fatigue, and even loss of vision.
However, there is no evidence that different wavelengths of light from the screen can damage the eyes. Dr Khurana recommends not using glasses that claim to protect the eyes from blue light, as there is also a lack of evidence that they are effective.
Is blue light only harmful to the body?
Blue light has been shown to affect the body's circadian rhythms. Too much blue light coming into contact with electronic products such as mobile phones at night can damage people's ability to fall asleep.
Therefore, it is recommended that you limit screen time two to three hours before going to bed, and adjust the electronic equipment to night mode, so as to reduce glare, alleviate visual fatigue and minimize the blue light at night.
However, with the further understanding of blue light, it has been found that blue light plays an important role in maintaining human health, such as regulating hormone secretion. At the same time, blue light can also avoid reducing night vision, which is also beneficial to the refractive development of adolescents and minors.
How to protect your eyes?
Nowadays, screen terminals are everywhere. In order to protect our eyes, we recommend the following methods based on the recommendation of American eye Association:
01,Keep a reasonable distance from the computer screen, about 0.6 meters (about the length of one arm), and the angle of view should not be less than 15 degrees, or stand up and adjust at intervals.
02
Screen filters can be used to reduce glare.
03
Use the "20-20-20" rule to have regular rest: reduce the use of computers or mobile phones, pay attention to the intermediate rest, get up every 20 minutes or so, or overlook the scenery outside the window.
04
Reduce the use of air conditioning, pay attention to air humidification, reduce the symptoms of dry eyes.
05
Adjust indoor lighting and screen contrast to reduce eye fatigue.
06
People who wear contact lenses can wear frame glasses to rest their eyes.
07
Pay attention to eyelid hygiene. Wash your hands frequently and don't rub your eyes.
08
Blink more. It is recommended to blink 4-6 times per minute, with complete tear film, which can reduce dry, pain and blurred vision.
If there is any other discomfort in the eyes, it is recommended to go to the eye department. The society also recommends that everyone should have an eye system check before the age of 40, and a comprehensive eye check from an ophthalmologist on a regular basis is essential for the early diagnosis of any potential eye disease.
How should children use electronic equipment?
The electronic products of mobile phones are becoming more and more child friendly. What are the restrictions on the use of screens for children?
Studies have suggested that daily screen use is related to child development, obesity, poor sleep quality and eye development. In Asia, up to 90% of adolescents and adults are nearsighted.
The World Health Organization recently released new guidelines that recommend zero screen time for children up to the age of one, and as little screen time as possible for children in the following years. The American Academy of Pediatrics recommends that digital media (except video chat) not be used in children between 18 and 24 months of age.
in summary
There is no scientific evidence
Blue light from digital devices
Can cause damage to eyes
therefore
I suggest you
Eye protection
We should start with the little things in our daily life.
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