Most fish don't have eyelids for the simple reason that fish live in water all day and their eyeballs don't need extra nutrition. You need eyelids as soon as you come out of the water, so amphibians and vertebrates have eyelids. Anura amphibians, reptiles and birds have a transparent eyelid, called the instantaneous membrane, which is also called the "third eyelid", besides the upper eyelid and the lower eyelid. Can cover the cornea, thus wetting the eyeball, but does not affect the line of sight. Kind of like contact lenses used by modern people. Especially when birds fly at high altitude, they use blink film to prevent the damage of sandstorm to the eyeball. Mammalian cataracts have degenerated, that is, the degenerated cataracts still remain in the inner corner of the eye, which is a fixed semilunar fold. Moisturizing and protecting eyeball can only rely on developed upper and lower eyelids. Another important function of eyelid is shading, which is indispensable from closing eyes to sleeping. And fish have no eyelids and keep their eyes open. Doesn't it sleep? It is impossible not to sleep, because it does not conform to the way of yin and yang. Just observe it. Every night, goldfish will hide in dark places such as small rockeries and aquatic plants in the fish tank. This is the state of goldfish when they sleep. Most fish living in fresh water in nature sleep behind rocks and in the dark of aquatic plants. When night comes, other fish will get into the sand and sleep motionless and quietly, which can effectively prevent the harm of natural enemies. There are also fish that secrete a special gelatinous substance in their bodies. When they want to sleep, they blow a big bubble. Gelatinous bubbles harden when they meet water, and then they get into the bubbles, leaving only a small hole in their mouths, just like in sleeping bags. The common eyelid diseases in clinic are related to these two things, and even if the eyelids are closed, they cannot be closed or moisturized. For example, patients with hyperthyroidism usually have exophthalmos and exophthalmos, which will lead to the inability to close eyelids. The pain of the patient is that he can't sleep at night. Even if you can sleep for a while, you need to wake yourself up regularly to drop artificial tears or apply protective eye ointment, otherwise the cornea will become hard, infected and necrotic due to lack of water. There is also a kind of dry eye patients, tears secretion is insufficient or the composition of tears is abnormal, and the eyeballs cannot be moist. Eyelids only play a role similar to the windshield wiper of an automobile. There is no internal glass water and rain outside, and the wiper can only wear the eyeball. The main causes of dry eye are staying up late and overusing eyes. Inattention means that people don't sleep or blink because of nervousness and excitement. This situation is very common now, such as people who play games at night and stare at their mobile phones at night. Doing so consumes too much body fluid to supply the eyeball, and at the same time it can't provide sleep for eyeball repair, so many young people will have symptoms such as dry eye, photophobia, dryness, pain and decreased vision. Dry eye in middle-aged and elderly people is generally related to the decline of general function, accompanied by symptoms such as dry nose and vaginal dryness, which need to adjust the immune function of the whole body.
In addition to paying attention to eye hygiene, I often do eye exercises, get up before going to bed or in the morning every day, rub my hands and buckle my palms inward on my eyes several times, which has a good protective and moisturizing effect on my eyes.
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"Tibetan doctors are in the air"-eyelids
"Tibetan doctors are in the air"-eyelids
Eyelids are eyelids and eye cells. As far as humans are concerned, eyelids are divided into upper eyelids and lower eyelids. The crack that separates the upper eyelid from the lower eyelid is called blepharoptosis, the corner of the eye near the bridge of the nose is called the inner eyelid, and the outer eyelid is called the outer eyelid. The bottom of the upper eyelid and the top of the lower eyelid are called palpebral margin, and there are 2 ~ 3 lines of eyelashes on it. Eyelashes are bent outward, which can prevent dust and weaken strong light.
Page 1
When it comes to eyelids, the most common topics are single eyelids and double eyelids. Single eyelid, also called single eyelid, has no folds. Before the Qin and Han Dynasties, the lineage of the Han nationality was probably pure, with single eyelids, which can be proved by the unearthed Qin figurines. Double eyelid means that the skin of the upper eyelid has a shallow groove above the eyelid margin. When you open your eyes, the skin under this groove moves upward, while the skin above this groove hangs loosely at the double eyelid groove and folds down into a horizontal fold, which is also commonly known as double eyelid. The cause of single and double eyelids is mainly biological inheritance. Double eyelids are dominant traits, while single eyelids are recessive traits. There are other reasons, for example, some people sometimes have single eyelids and sometimes become double eyelids. Some people have a single eyelid in one eye and a double eyelid in the other.
page 2
Whether a single eyelid looks good or a double eyelid looks good has different opinions. As far as shielding eyeball from sandstorm is concerned, the protective effect of single eyelid and its eyelashes is better. People with single eyelids have very narrow eyes and have the feeling of squinting. Most of the beautiful women in ancient pictures in China are like this, so the single eyelid is also called classical beauty. Modern people say that Liu's almond eyes refer to double eyelids, and his eyes are big and bulging.
Page 3
Nowadays, there are more and more cosmetic plastic surgery. In fact, the earliest cosmetic surgery in China was "double eyelid cutting" 30 years ago. This minimally invasive surgery itself is to treat trichiasis, that is, to treat eyelash involution and scratch the eyeball. The method is to draw a knife on the palpebral margin of the upper eyelid to form a scar, the scar contracts to form a double eyelid, and the abducent eyelashes of the palpebral margin turn upward to avoid scratching the eyeball. Because the side effect of surgery is to turn people into double eyelids, many people pretend to have the problem of inverted eyelashes to cut this knife.
The outer side of eyelid is skin, and the side close to eyeball is conjunctiva, which is lined on the inner side of eyelid and attached to the front of eyeball. The conjunctiva is rich in blood vessels and nerve endings, and there are a few mucus glands, which can secrete mucus, lubricate the eyeball and reduce the friction between eyelid conjunctiva and cornea. The first step of ophthalmology practice is to learn to turn the eyelids, and turn the patient's upper eyelids upward to expose the red conjunctiva. You can find out whether the patient is anemia, trachoma, eye stones or other inflammation at a glance. Trachoma is not sand entering the eyes, but chlamydia invading the conjunctiva of eyelids and fornix. Acute bacterial conjunctivitis and viral conjunctivitis are both caused by bacteria and viruses infecting the conjunctiva, which are both contagious.
Page 4
Most fish don't have eyelids for the simple reason that fish live in water all day and their eyeballs don't need extra nutrition. You need eyelids as soon as you come out of the water, so amphibians and vertebrates have eyelids. Anura amphibians, reptiles and birds have a transparent eyelid, called the instantaneous membrane, which is also called the "third eyelid", besides the upper eyelid and the lower eyelid. Can cover the cornea, thus wetting the eyeball, but does not affect the line of sight. It's a bit like contact lenses used by modern people. Especially when birds fly at high altitude, they use blink film to prevent the damage of sandstorm to the eyeball. Mammalian cataracts have degenerated, that is, the degenerated cataracts still remain in the inner corner of the eye, which is a fixed semilunar fold. Moisturizing and protecting eyeball can only rely on developed upper and lower eyelids.
Page 5
Another important function of eyelid is shading, which is indispensable from closing eyes to sleeping. And fish have no eyelids and keep their eyes open. Doesn't it sleep? It is impossible not to sleep, because it does not conform to the way of yin and yang. Just observe it. Every night, goldfish will hide in dark places such as small rockeries and aquatic plants in the fish tank. This is the state of goldfish when they sleep. Most fish living in fresh water in nature sleep behind rocks and in the dark of aquatic plants. When night comes, other fish will get into the sand and sleep motionless and quietly, which can effectively prevent the harm of natural enemies. There are also fish that secrete a special gelatinous substance in their bodies. When they want to sleep, they blow a big bubble. Gelatinous bubbles harden when they meet water, and then they get into the bubbles, leaving only a small hole in their mouths, just like in sleeping bags.
Page 6
The common eyelid diseases in clinic are related to these two things, and even if the eyelids are closed, they cannot be closed or moisturized. For example, patients with hyperthyroidism usually have exophthalmos and exophthalmos, which will lead to the inability to close eyelids. The pain of the patient is that he can't sleep at night. Even if you can sleep for a while, you need to wake yourself up regularly to drop artificial tears or apply protective eye ointment, otherwise the cornea will become hard, infected and necrotic due to lack of water.
Page 7
There is also a kind of dry eye patients, tears secretion is insufficient or the composition of tears is abnormal, and the eyeballs cannot be moist. Eyelids only play a role similar to the windshield wiper of an automobile. There is no internal glass water and rain outside, and the wiper can only wear the eyeball.
The main causes of dry eye are staying up late and overusing eyes. Inattention means that people don't sleep or blink because of nervousness and excitement. This situation is very common now, such as people who play games at night and stare at their mobile phones at night. Doing so consumes too much body fluid to supply the eyeball, and at the same time it can't provide sleep for eyeball repair, so many young people will have symptoms such as dry eye, photophobia, dryness, pain and decreased vision. Dry eye in middle-aged and elderly people is generally related to the decline of general function, accompanied by symptoms such as dry nose and vaginal dryness, which need to adjust the immune function of the whole body.
Page 8
In addition to paying attention to eye hygiene, I often do eye exercises, get up before going to bed or in the morning every day, rub my hands and buckle my palms inward on my eyes several times, which has a good protective and moisturizing effect on my eyes.