Why is the movement of the eyeball not continuous, but beating?

When reading, readers rely on eyeball movements to read a book, which is a fundamental feature of the visual process during reading. According to the measurement of the oculometer actimeter, the duration of the saccade during reading is about seconds, and the saccade time within a line is about seconds, so that the eyeball is not moving for about 95% of the time during the whole reading process.

That is, information can only be received during the fixation interval between beats. At this moment, just like the camera opening the shutter, where to place the fixation point, how long the fixation time is controlled, and whether the fixation focus and range are synchronized with the focus and range of consciousness are the visual basis for the design of all reading skills.

The number of eye stops and the length of each fixation are related to reading ability, difficulty of reading material, and reading requirements (skimming, intensive reading, or browsing). If you have strong reading ability, the reading material is superficial, or you only need to memorize the general idea of the content of the reading, the number of fixations can be less, the range of fixation can be larger, and the average time of fixation can be shorter. On the contrary, if the reading ability is poor, the reading material is difficult or demanding, it is necessary to consciously prolong the time of fixation, increase the number of fixations, and narrow the scope of fixation.

The phenomenon of non-stop beating of the eyes is likely to be caused by overwork and overuse of the eyes, because prolonged use of the eyes, such as looking at mobile phones, or overwork, can easily lead to muscle spasm of the local eyelids, thus causing this symptom. Conjunctival inflammation can also cause this, but symptoms can recover quickly with rest, dietary conditioning, or the use of eye drops**Conjunctival inflammation. If the phenomenon of eye beating persists, it is necessary to rule out whether it is caused by facial muscle spasm, and the specific ** may not be particularly clear, it may be related to microvascular compression, and it may also be secondary to brain tumors.

Therefore, if it persists, it is best to go to the neurology department of the hospital for further examination to determine the specific cause.

Stare at your own eyeballs in the mirror, turn your head slowly, turn your eyes carefully not to take your eyes off your eyeballs, and you will find that the rotation of your eyeballs can be changed in a continuous way, sitting on a swivel chair, staring ahead. When the swivel chair rotates, the scene in your field of vision will pass by at a rapid pace, and if the swivel chair is extremely fast, the scene you are gazing at will become an afterimage. In fact, the movement of the eye is certainly continuous, and from its own point of view, the brain chooses to omit the scene when it turns, leaving only a rough impression.

Why is the movement of the eyeball not continuous, but beating? There are many reasons why your eyes can flutter, including the following:

Clause. 1. Excessive eye fatigue, long-term excessive use of eyes, staying up late, mental pressure, etc., will cause the eyes to be in a state of excessive fatigue, and the eyes and optic nerve are in a state of high tension, which is easy to cause the eyeball to beat.

Clause. 2. Optic nerve and central nervous system are overexcited, when the optic nerve and the central nervous system of the brain that controls the eyeball are in a state of abnormal excitement, it will also cause the eyeball to beat, and even the frequency is higher called nystagmus.

The rotation of the eyeball is continuous, and the first consideration of the eyeball is the spasm of the eye muscles caused by eye fatigue, which is like a pulse of blood vessels, so it is recommended to reduce the use of the eyes and use a warm towel to relieve the blood circulation around the eyes.

There are two ways for people to move their eyes quickly: one is to turn left and right; The second is to make a circular motion in the eye socket. Often, they mean different things.

1) Turning left and right is tense. In film and television dramas, I often see such a picture: the protagonist walks in the underground parking lot, and suddenly feels that the atmosphere is not right, so he will stop, and his eyes roll back and forth in his eye sockets, observing the movements around him, which is a sign of tension and vigilance.

A person will also show such an expression when he does something bad, and a thief or a robber will survey the surrounding situation in this way before committing a crime, which is a state of uneasiness and guard.

2) Circular rotation is thinking. At this time, the movement of the eyes is a kind of preparatory response before taking countermeasures, and the activity of the brain's thinking drives the rapid movement of the eyeballs, indicating that they are thinking at this time.

So, when we see this expression on someone's face, we know that they are using their brains, and new ideas will come up soon.

Our eyes can move freely because the eye has six muscles that control the movement of the eyeball. These six muscles are the superior and inferior rectus, the medial and lateral rectus muscles, and the superior and inferior oblique muscles.

They are innervated by the oculomotor, trochlear, and abducens nerves. The medial and lateral rectus muscles are responsible for turning the eyeball inward or outward; When the superior and inferior rectus muscles contract, the eyeball turns up or down, and at the same time the eye rotates inward; The superior oblique muscle mainly rotates the eye inward, but also turns the eye downward and outward; The inferior oblique muscle mainly rotates the eyeball outward, but also turns the eyeball upward and outward. These six muscles work closely with each other to make the eyeballs move freely up and down, left and right in unison.

The inner activity of a person can also be expressed by the movement of the eyeballs. When we usually use our brains, our eyes will roll in a dripping way; When we are absent-minded, our eyes move aimlessly. When the eye is turned in all directions, there is always more than one muscle that plays the main role, and several other muscles play a coordinating role.

The movements of both eyes must be consistent, and when the eye is looking to the right, the right lateral rectus muscle and the left medial rectus muscle must contract equally at the same time, otherwise binocular monovision cannot be obtained.

However, when only one or more of the six muscles that control the rotation of the eye are inflamed, traumatized or neurologically disturbed, the movements of the binocular muscles are uncoordinated, and the movement of the eyeball will be restricted, or the eyeball will be tilted to one side, forming strabismus, and then it will be particularly difficult to see; Or an object can be seen as two, resulting in double vision, i.e., double vision.

I think this has a certain relationship with the musculature of the eyeball, and even if the eyeball is jumping and jumping, then some of the visual space it shows is not like the eyeball, jumping and jumping, because the distribution rate of the eye is very high, and the musculature of the eyeball is also very sensitive by 1 degree, so a jump does not affect the light sensitivity of the eye.

Saccade, the movement of the eye when the head does not move and the gaze shifts from one object or direction to another. Due to the movement of the target, the visual process will undergo continuous changes in the line of sight, this process is called saccade, when the rapid saccade, the amplitude of the eye movement changes greatly, the purpose is to make the retinal fovea align with the target of fixation, and maintain the linear relationship between the fovea and the target. However, if the eye movement is too large, the image that has fallen on the ** concave will slide through.

At this point, the eyeball has to be turned in the opposite direction. It is very fast and is a phenomenon unique to human vision. [1]

The eyeballs always jump is actually the involuntary and rhythmic swing or beating of the eyeballs, which is called nystagmus, which is mainly divided into congenital and acquired. Congenital idiopathic nystagmus has rapid nystagmus, which is more obvious when looking at the distant point, which is motor nystagmus, and the damage is caused by the efferent pathway from the frontal lobe of the brain to the extraocular muscles. Nystagmus block syndrome is a congenital esotropia, and the instability of esotropia is inversely related to the degree of nystagmus.

I believe that most people have had the experience of jumping eyes, and there is also a saying that the left eye jumps for wealth and the right eye jumps for disaster. This statement is actually a misunderstanding.

For us doctors, whether it is a beat of the left eye or the beating of the right eye is collectively referred to as blepharospasm in medicine, so how is blepharospasm caused?

Most of the causes of blepharospasm are due to mental stress, lack of sleep, and eye fatigue caused by overuse of the eyes. But there are also some that are difficult to find out the specific **.

For those who experience occasional nysax jumps, the nysax can gradually subside as long as you get enough sleep. For people with frequent eye beats, there are a few things that need to be done.

On the premise of ensuring adequate sleep, do some medications**, such as supplementing with more vitamin B, or injecting some drugs into the acupuncture points next to the eyes to relieve the phenomenon of eye beating.

There are several reasons why the eyes keep beating: first, it may be caused by the lack of rest in the eyes for a long time, which causes insufficient blood supply to the nerves around the eyes, and in this case, you can take some drugs that nourish the nerves, such as vitamin B12; Second, it may be caused by muscle spasm around the eyes, you can apply a warm compress or massage the eyes, which is conducive to the blood circulation of the eyes and can relieve the symptoms well; Third, it may be caused by excessive mental stress, and it is recommended to exercise outdoors appropriately to relax the mind.

If the patient has symptoms of eyes that are always beating, it is necessary to observe whether the frequency of the eye beating is short-term or long-term. The specific causes of eye twitching are as follows:

1. Physiological reasons:

If the patient's eye beating is short-term, it may be related to high mental stress, nervousness, or the patient's emergency situation, emotional agitation, or fatigue during the day. Patients may experience a decrease or disappearance of eye beating after changes in mood and short-term stress.

2. Pathological causes:

1. Facial muscle spasm: The above manifestations may also be related to facial muscle spasm, usually patients can have eyes beating when they are emotional, and they can disappear in a quiet state or during sleep. Head angiography is done to observe local compression of the facial nerve by the cerebeltine angle.

If there is compression of the opposite facial nerve, it can cause the eye muscles to beat. However, the runout is usually confined to one side and is rarely bilateral. Patients may be treated with medications** or surgery** to improve symptoms;

2. Sequelae of facial neuritis: In addition, the sequelae of facial neuritis may also cause eye beating, and some patients have sequelae after facial neuritis**, and the muscles at the corners of the eyes or the corners of the mouth will beat involuntarily;

3. Other diseases: some tumors can compress local nerves, or local nerve damage caused by trauma, etc., which can cause patients to have symptoms of eye beating.

This condition of the eye, known as blepharospasm, is caused by a lesion of the orbicularis oculi muscle, or the nerve that innervates the orbicularis oculi muscle, resulting in involuntary twitching of the orbicularis oculi muscle. For young people who have blepharospasm, this condition is usually related to fatigue, cold, anxiety, nervousness, mental stress, poor rest, and staying up late, so it is necessary to pay attention to improving lifestyle, do not rub your eyes, avoid excessive fatigue, ensure adequate rest, and take oral neurotrophic drugs, such as methylcobalamin, to promote recovery.

For middle-aged and elderly people with blepharospasm, it is necessary to go to the neurology department of the hospital for examination to rule out the lesions of the nervous system, such as the common V-shaped cerebral infarction, facial neuritis, etc.

After diagnosis, the primary disease is targeted**.

Eyelid flutter is medically known as blephalid tremor or blepharospasm, which is a sudden and repetitive fluttering spasm caused by autonomic disorders that affect the fibrous part of the orbicularis oculi muscle of the eyelids.

There are two kinds of eyelid beating: physiological and pathological, the former accounts for the vast majority, and then the eyes are overused or tired, people are overly nervous, stressed, and excessive smoking and alcohol. Seizures are short, usually a few seconds, and the throbbing is not severe.

If the eyelids keep beating for a long time, the patient should seek medical attention at a professional eye hospital.

It is very likely that the eyes are constantly beating because of overuse and overwork. Conjunctivitis can also cause such symptoms, so it is recommended to rest first, protect your eyes, and see a doctor.

The patient's eyes are constantly beating, which may be caused by the compression of the patient's ocular nerve, including external and internal causes; Secondly, it may also be related to the condition of the patient's eye muscles; In addition, some physiological factors can also cause eyelid jumps; Finally, physiological factors such as facing exams can also be a trigger.

Clinically, both eyes beat because of the spasmodic contraction of the orbicularis oculi muscle around the eye, and the result of the spasmodic contraction causes the eyelids of the eye to throb. This situation is more common because of such as poor sleep, staying up all night, high work pressure, mental tension, etc., these factors are often some triggers that cause eyelid jumping, but sometimes this happens when there is no obvious trigger.

There is no need to be too nervous after this happens, because this eyelid throbbing is often temporary, and most of them can be relieved on their own, and the frequency or frequency of the beating will not be too much. If there is a persistent, unrelieved eyelid throbbing, accompanied by facial twitching, it is necessary to go to the hospital in time because there is a possibility of facial muscle spasm and it needs to be checked promptly**.

It doesn't matter, it's the nerves that are commanding your muscles to do the action, and it will be fine after a while.