There used to be a famous question called 'staying fart, where did you go last?', but today, what the big breasts want to discuss is the foreign objects that fly into the eyes. Where did they go last?
In daily life, it is inevitable that some foreign objects will fly into the eyes, such as small flying insects, sand, dust, debris, eyelashes, etc. Once inside, it is not generally uncomfortable, eyes mad, tears mad. In an all night Eyes, blinks, blinks, squinting, suddenly the eyes are dark, the foreign bodies are gone, and the whole world is bright again.
However, we can't help but ask, most of the foreign objects that fly into the eyes, why did they disappear in the end? Where are these 'eyes' things gone? Are they washed away by tears, or absorbed by the eyes? Will you run behind the eyeballs?
1. Before we talk about these problems, let's take a look at the structure of the eyeball.
Our eyeballs are mainly composed of the eye wall and the contents. The eye wall is divided into three layers, the outer layer is the fibrous membrane, the middle layer is the uvea, and the inner layer is the retina. The eyeball contents include aqueous humor, lens and vitreous. 3. The medium is the path through which light enters the eye and reaches the retina.
There is a very important structure on the wall of the eyeball, called 'corn cornea', which is the transparent, elliptical stuff of the outer layer of the black eyeball we often see.
There are no blood vessels on the cornea, but there are a lot of abnormally sensitive sensory nerve endings. As soon as something touches it, it will cause conditioned reflexes, blink quickly, prevent foreign matter from entering the eyes, and secrete a lot of tears to protect the eyes. That's why we often say 'no sand in your eyes'.
2, Since 'there is no sand in your eyes', where did the sand go last?
1) Was washed away by tears.
Under normal circumstances, when foreign matter enters the eye, especially on the cornea, a large amount of tears will be secreted from the lacrimal gland. At this time, the tears act like a 'wiping device' on the front glass window of the car, which acts as a flushing and dilution. Protect the cornea and conjunctiva from damage. Under the scouring of tears, foreign matter will flow out.
2) Continue to stay in your eyes.
The cornea area of the eye is particularly sensitive, while other areas are relatively dull. When the sand enters the eye, under the action of blinking and tearing, foreign matter is brought to the area outside the cornea, and the feeling of discomfort is relieved. At this time, we think that the foreign body has left the eye. In fact, they are probably still in the eyes, but it is not easy to feel.
But don't worry, they are usually hidden in a relatively hidden position, such as the inner corner of the eye. When sleeping at night, the oil secreted by the seesaw will mix with these dirty things, become eyelids, and be washed off when washing your face.
3) Entered the nasal cavity.
Eyes and nose are connected through the nasolacrimal duct. Of course, when people secrete tears, a small amount of tears will flow into the nasal cavity through the nasolacrimal duct, so some foreign bodies may eventually flow into the nose with tears and become snot.
4) Don't worry, you won't run to the back of your eyes.
Some people will worry that the foreign body will go to the back of the eye. Actually, it will not. Because there is a layer of mucous membrane in the lower eyelid and in front of the eyeball, that is, the conjunctiva. The conjunctiva is connected to the eyelid after refolding to form a complete membrane structure. 'Gap' left the foreign body to the back of the eyeball.
3. What should I do if my eyes are fascinated?
'I got sand in my eyes.'
'I will help you blow it.'
This is the standard dialogue after many eyes enter the sand.
However, telling the truth, blowing it may really solve the problem. First, it promotes the tears of the eyes and brings out the foreign bodies. Second, the foreign body is blown off the surface of the cornea, and the feeling of uncomfortableness is lowered. Third, it is really possible to blow out the foreign body.
But '揉' will not work.
If the foreign body is larger or harder, the blinking may scratch the cornea and conjunctiva, causing infection. In addition, sometimes the small insects fly into the eyes. If you blink your eyes, although you may be able to pull out the insects, but the small insects The body hair may be embedded in the tissues of the eye, which is extremely difficult to remove, and may cause an allergic reaction to the whole body, even anaphylactic shock.
If the real thing is in the eye, the correct way is:
1) First, you should gently close your eyes for a while, or lift the upper eyelids by hand. Generally, foreign objects attached to the surface can be discharged with tears.
2) If the foreign body of the eye cannot be discharged by itself, the foreign body may be on the conjunctiva inside the upper eyelid. Turn the eyelid over to find the foreign object, gently wipe it off with a wet cotton swab or a clean handkerchief, or rinse with clean water. Disappeared immediately.
3) If you have not found any foreign objects in your eyelids, then the foreign body may be on the cornea. Do not take it yourself. You should go find someone to help you find it, or go to the hospital for treatment.
