In fact, we all know that playing with mobile phones after turning off the lights is not good for the eyes, but the specific harm is not very clear, which leads to many people not having a good understanding of the hazards and always can't help but want to play.
So, what are the effects on the body of frequently turning off the lights and looking at your phone? How can you play healthier?
1
Turn off the lights and look at your phone often
There are 4 possible hazards to the eyes
Let's first take a look at what is bad for the eyes when the lights are turned off and playing with the phone.
1 Appears to be temporarily unclear
It is mainly manifested in the fact that after playing with the mobile phone in the dark for a long time, one eye can see things, and the other eye can not see clearly for a while, and it will take a few minutes to slow down, which is mainly related to the habit of using the mobile phone and the dark adaptation of the human eye.
At this time, if the room is not turned on and the mobile phone is turned on, and the mobile phone screen is suddenly turned off, in a darker environment, you may find that the eye that looked at the mobile phone before can not see, but the other eye can, in fact, this is the dark adaptation of the human eye. Usually we also feel this way when we go from a bright place to a dark place, and it takes a little time to get used to seeing things in the dark place.
This is because we see with our human eyes two types of photoreceptors: cones and rods. Under the stimulation of strong light, the cones can immediately put into work, so from dark places to bright places, although we may feel dazzling, but we can see objects clearly in an instant, this process is called light adaptation. In the dark environment, rods work, and it takes a certain amount of adaptation time to start working.
In addition to dark adaptation, it has also been reported in the literature that playing with mobile phones in low light for a long time may have some effects on photoreceptor cells, resulting in vision loss. However, it is basically reversible, and generally after a period of time, the visual function of the eye can be restored.
2 Causes dry eyes and eye strain
Studies have shown that many people may experience symptoms of visual fatigue such as blurred vision, eye swelling, and eye pain after using the computer for 1 hour, and the severity of visual fatigue is significantly related to the time spent using video terminals. The screen of a mobile phone is smaller than that of a computer and the distance you can see is closer, so the burden on your eyes is heavier and you are more likely to experience eye strain.
Healthy eyes that always look black and white. The black eyeballs are not completely black, the surface is a colorless and transparent cornea, and the iris below is like most of our Chinese people are dark brown. The white eyeball is the sclera, and there is a thin layer of tissue on the surface of the sclera called the conjunctiva.
Usually the blood vessels on the conjunctiva are "dormant" and are not visible. In the event of an infection or other irritation, the "dormant" blood vessels dilate and congest, speeding up the metabolism, which we can see as redness. If your eyes are red after staying up late, it is actually your eyes that remind you that it is tired and you need to rest.
There is also a layer of structure on the surface of the eyeball called tear film, which mainly plays the role of moisturizing the cornea, staring at the mobile phone screen for a long time, the eyes will involuntarily reduce the frequency of blinking, resulting in more evaporation of tears, and the stability of the tear film will decrease, which is prone to dry eyes, soreness and other dry eye and visual fatigue symptoms.
3 Leads to the onset and progression of myopia
It is well known that for children, too much close-up use of the eyes can lead to ciliary muscle fatigue, which increases the likelihood of myopia. However, in fact, adults who use their eyes too much at close range may also lead to an increase in myopia.
Especially at night, if you lie on your side and look at your mobile phone, and only use one eye to see for a long time, it may also appear that the myopia of this eye develops faster, resulting in a large difference in the power of the two eyes, which further affects the binocular vision function.
4 Causes angle-closure glaucoma attacks
Glaucoma is an irreversible blinding eye disease that causes optic nerve damage due to excessive pressure in the eyeball, which is beyond its ability to bear. Clinically, intraocular pressure of 10mmHg~21mmHg is defined as the normal intraocular pressure range, and the stability of intraocular pressure mainly depends on the aqueous humor circulation in the eyeball.
Turn off the light and play with the mobile phone, in the dark light environment, the pupil will become larger, for people who have some special eye structure, such as small eyeballs and narrow angles, it may affect the circulation of aqueous humor, and there will be a sudden increase in intraocular pressure, resulting in an acute attack of glaucoma. When attacked, not only can you have eye pain and headaches, but you may also cause irreversible damage to your vision.
2
Play with your phone at night
Are Night Mode useful?
The eye protection mode of the mobile phone is mainly to protect the eyes from the perspective of anti-blue light, blue light itself exists in the sun, and LED lights, LCD monitors and mobile phone screens in life will release blue light.
Depending on the wavelength, blue light can be divided into shorter wavelengths (400 to 440 nm) and longer wavelengths (440 to 500 nm). Shorter wavelengths of blue light are thought to be high in energy and have the potential to cause fundus damage, while longer wavelengths of blue light are good for our dark vision and circadian rhythms.
The peak spectrum of LED light sources in our daily lives is mostly 450 to 500 nanometers, and in terms of the illuminance of mobile phone screens, there is usually little need to worry about causing damage to the fundus.
The night mode of the mobile phone is usually set to adjust the brightness of the screen accordingly with the brightness of the ambient light source, such as the room is dark, the brightness of the mobile phone screen will also be dimmed, theoretically speaking, it will relax people's nerves and gradually transition to sleep.
But as mentioned earlier, this kind of dark light is not very friendly to the eyes, so it is not good to just rely on eye protection/night mode to brush your phone at night.
3
Do these 3 things when swiping your phone
More eye-friendly
It is a habit for many people to brush their mobile phones before going to bed, and it is basically difficult to quit completely, but pay attention to the following points to reduce the damage to the eyes to a certain extent.
1 Adjust the ambient light
If you must use your mobile phone before going to bed, it is more appropriate to turn on a reading light or night light in the room so that the contrast between the surrounding environment and the brightness of the screen is not too large.
2 Pay attention to your eye posture
It's better not to play lying down, it's better to sit down. The distance between the eyes and the phone should not be too close, it is better to be relatively far away from your own comfort. If you must play lying down, don't lie on your side, and keep your eyes at the same distance from the screen.
3 Control the time you spend using your eyes
Playing less is better than anything else, but if you really can't do it, then increase the rest interval, you can use the 20-20-20 rule to rest, that is, use your eyes for 20 minutes, at least 20 seconds, close your eyes or look into the distance.
Finally, when you wake up in the morning and look at yourself in the mirror with red eyes, if you feel dry eyes and astringent eyes, then you should pay attention, your eyes are overloaded and need to be adjusted.
Source: Xinhuanet