Myopia is also related to eating habits

Abstract: eating too little hard food is also one of the reasons for the increase of juvenile myopia. Chewing is known as an alternative “eye exercises”. Eat more chewy hard foods such as carrots, soybeans and fruits to increase the opportunity of chewing.

there is no unified conclusion about how myopia is formed. Generally speaking, myopia is caused by over myopia, extraocular muscle traction and lack of race, physique, nutrition, heredity and trace elements. Young people’s myopia is to use the eyes for a long time and close distance, resulting in adaptive changes in eye function and structure. At the same time of visual acuity fluctuation or decline, there are changes in eye structure, eye muscle traction, elevated intraocular pressure, long-term ocular congestion, increased eye content and scleral extension, so that eye development exceeds the normal proportion, and finally the eye axis is prolonged.

myopia can also be divided into true and false.

true myopia is also called axial myopia. The refractive power of the refractive stroma is normal, the anterior and posterior diameter of the ocular axis is prolonged, and the distant light is imaged in front of the retina after entering the eye. True myopia is irreversible. Pseudomyopia, also known as accommodative myopia, has a normal axial length, but the refractive power of the refractive stroma exceeds the normal degree, which is generally due to excessive lens adjustment. Therefore, distant light is imaged in front of the retina after entering the eye. In general, abnormal vision may occur, and sometimes you can’t see distant objects clearly. After mydriasis, the diopter of myopia completely disappeared, manifested as emmetropia or hyperopia. It can disappear after treatment. Pseudomyopia and true myopia can be distinguished by cycloplegic mydriasis. There was no obvious diopter after mydriasis, and the person with improved vision was pseudomyopia; If there is a certain diopter after mydriasis, it must be corrected with a lens in order to improve vision, it is true myopia. True myopia can be treated with glasses, contact lenses and surgery. Pseudomyopia can be treated by acupoint massage, acupuncture, electrical stimulation, physiotherapy and other methods to restore vision.

early prevention of myopia

(1) avoid looking close for too long. Pay attention to reading, writing, operating the computer, etc. after watching for nearly 40 minutes, rest and look at the distance for 10-15 minutes. Try to control the cumulative viewing time every day, preferably no more than 6 hours.


(2) change reading habits and reduce the load on eyes.

(3) pay attention to improving the environment that needs a long time to look close. The light in the classroom should be bright. The desktop and blackboard should not reflect too much. There should be windows on the left and right sides, not too high or too small. It is appropriate to see the window from any position in the classroom, and change seats regularly; The desk at home should be placed in front of the window without shelter outside, and the desk lamp should be placed in the front left. The light should be soft. If it is an incandescent lamp, it is better to be between 25-40w, and the position should not directly illuminate the eyes.


(4) correct poor close-up posture. When reading and operating the computer, pay attention to keep the distance between the eyes and the book at about 33cm. The distance between the eyes and the computer screen with a size of 35cm shall not be less than 60cm, and the distance between the eyes and the computer screen with a size of 38cm shall not be less than 70cm. Posture should be correct. You can’t read while lying down or walking.

(5) try to play fewer games that require a long time to look close. Such as personal toys, game consoles, computers, televisions, etc., try to reduce the visual environment.

(6) if the eyes are dry and red, feel burning or foreign body, have heavy eyelids, see things vaguely, or even have eye swelling pain or headache when looking close, it indicates that the symptoms of visual fatigue have occurred. To stop looking close immediately, you can do eye exercises, and you can also use a damp hot towel to compress your eyes to alleviate visual fatigue.

vision is also related to eating habits. One of the causes of myopia is that eating too sweet consumes a lot of vitamin B1 in the body, reduces calcium in the body, weakens the elasticity of the eye wall, and leads to the occurrence of myopia;


the second cause of myopia: eating too much essence and eating fine food for a long time, resulting in lack of chromium in the body, convex lens, increased diopter and myopia. Chromium mainly exists in coarse grains, brown sugar, vegetables and fruits;

the third cause of myopia: eating too soft. Eating too little hard food is also one of the reasons for the increase of juvenile myopia. Chewing is known as an alternative “eye exercises”. Eat more chewy hard foods such as carrots, soybeans and fruits to increase the opportunity of chewing.

in addition, lutein can ensure the normal metabolism of the retina and cornea of the eye. Too little intake can lead to myopia. You should eat more fresh green vegetables and citrus fruits; Protein, calcium and phosphorus are one of the main substances to enhance scleral toughness. They can prevent myopia. We should eat more meat, fish, eggs and milk.

must be optometrically matched by professional doctors

now the computer optometry advertised by ordinary glasses stores is actually very unscientific and can not distinguish between true myopia and false myopia. It is often false myopia that also gives you glasses, which will deepen your near vision, eye fatigue and increase intraocular pressure. Professional medical optometry is a complex medical process. Director Zhang joked that he had mastered this technology after five years of learning and practice. Professional optometry process includes mydriasis, retest and audition. The general principle of mydriasis is that students before the age of 12 should first carry out the medical examination and optometry of atropine mydriasis, and then carry out the re examination after the pupil returns to normal 20 days. Students aged 12-18 can have rapid mydriatic optometry. After the pupil returns to normal the next day, they can have a retest. After the age of 18, non mydriasis optometry can be performed, and the audition can be performed directly after optometry. It is because the adjustment force is too strong during the student period, and most of them have partial pseudomyopia. Through mydriasis, the adjustment can be relatively paralyzed, and the degree of optometry can be more accurate.

excimer laser is an ultraviolet beam that can be focused and controlled accurately. Its cutting precision is very high, and the cutting depth of each optical pulse is 0.2 microns. It can carve various patterns on human hair. Excimer laser is a cold light source and does not produce heat, so it has no damage to the surrounding tissue. At present, the curative effect of surgery has been quite ideal, and the surgical complications are less and less.

excimer laser treatment of myopia

Doctors use excimer laser to treat myopia mainly by using the characteristics that excimer laser can accurately cut tissue and reshape corneal curvature with light beam to correct myopia. Before treatment, the doctor inputs the myopia degree into the computer, and the computer controls the cutting range and depth. The laser sends a series of laser pulses to irradiate the cornea, and cuts a smooth plane in the center of the cornea to flatten the corneal curvature. The light can be directly focused on the retina, and the vision becomes clear.

excimer laser in situ keratomileusis (LASIK) is a corneal refractive surgery further improved on the basis of PRK. This operation maintains the integrity of the anterior elastic layer of the cornea, has stable postoperative refraction, is easy to be treated again, and can correct myopia from 100 degrees to 3000 degrees.

subepithelial excimer laser keratectomy (LASEK) is a new refractive surgery treatment at home and abroad recently. It is different from LASIK in that the corneal flap of LASIK is thicker (130 microns), so patients with too high degree and thin corneal membrane, such as the remaining cornea after keratectomy is too thin (less than 250 microns), cannot perform LASIK; Because LASEK only makes supracorneal flap (less than 50 microns), LASEK operation can be performed for such patients.

postoperative vision will not retreat.

laser treatment of myopia is very effective and stable. Generally speaking, the effect of low myopia is better than that of high myopia, and the effect of non astigmatism is better than that of astigmatism. For myopia within 1000 degrees, more than 95% of patients do not need to wear glasses after operation. Some people think that it will recover in a year or two after operation, which is groundless.


for patients with deep myopia above 1000 degrees, they will not retreat after operation. Because our surgery for patients with deep myopia generally increases the correction slightly according to the degree of myopia. Due to the correct estimation in advance, even if there is a regression in one or two years, it just meets the correction requirements. Some patients retreat or wear glasses again, which is due to their own physique, eye condition and improper postoperative maintenance, but will not return to the original refractive state.

not all people with myopia can operate

although myopia laser correction has good effect and high safety, it does not mean that every patient with myopia is suitable for laser surgery. The general requirements suitable for laser surgery are: the age is 18 to 50 years old, the degree of myopia has been basically stable (no more than 50 degrees change every year), and my working environment is not suitable for wearing glasses, or I have a strong desire to remove glasses for various reasons (such as aesthetic requirements, uncomfortable wearing frame glasses, too troublesome wearing contact lenses or easy “inflammation”, etc.). In addition, it is also required that the general health is basically good, and there are no other serious eye diseases, such as keratoconus, glaucoma, cataract and fundus lesions.

operation has certain complications

although the operation has achieved good results in the treatment of myopia, the operation still has certain complications. Moreover, due to individual differences, different patients and two different eyes of the same patient may also have different reactions to the operation, which will affect the operation effect. Myopia correction surgery is a highly selective surgery, that is to say, surgical correction of vision is not the only correction method. Patients must consider carefully before surgery. Due to the irreversibility of treatment surgery, patients must try to choose a hospital with better technology and equipment for surgery.


now have fewer and fewer surgical complications. A few years ago, when excimer surgery first entered China, for economic interests, some medical institutions relaxed the indications and appeared iatrogenic keratoconus. Now the inspection in large hospitals is very strict, and the thickness of diagonal membrane should meet the very safe standard, otherwise they will not have surgery.


myopia surgery is not done well, and


can be repaired. Some people find that they are not doing well after excimer laser surgery. The original ideal vision reached 1.0, but some people’s vision is always about 0.6. Now the latest prestige s4-ir excimer laser equipment is equipped with iris positioning system, which has the function of postoperative repair. It can repair individual undercorrection, glare and other phenomena after excimer surgery. Now we have to repair more than ten patients with unsatisfactory surgery every month.

why do some people feel that the operation is not ideal, because the patient may not cooperate well during the operation. When the eyes see the edge, the laser is crooked and deviates from the pupil area. Poor machine tracking may also lead to the deviation of the operation center. Usually, when the corneal thickness reaches the allowable range, it can be repaired, and the visual acuity can be improved by about 200 degrees. The repair operation is best carried out within half a year after myopia operation, and the effect is more ideal.

daily eye care

eye gymnastics: turning the eyes can help cheer up; The second is moving eyes. You can have both. It is most suitable for teenagers. First, look straight ahead, keep your head still, look up as much as possible, then slowly look down, then slowly look left, and then slowly look right. You will feel relaxed and active after repeating this several times.

outdoor sports: the best way to protect your eyes is outdoor sports, such as playing ball, running, gymnastics, etc. go to the suburbs on holidays. Green mountains, green water, sunshine and fresh air are the patron saint of your eyes. If you can maintain the good habit of exercising every day, you can not only relax your spirit and activate your cells, but also the most ideal maintenance method for your eyes.

telescopic exercise: when you need to read or use your eyes for a long time, remember to take a break every 50 minutes, and do telescopic exercise. Find a wide field of vision, stare at a main scene 20 meters away, concentrate on seeing clearly or searching for the target, move your line of sight, and look at things close after a few minutes. Repeat this several times, It can help the lens of the eye get proper adjustment.

eye closing exercise: eye closing is also a sport. It can be the best eye movement on some occasions. For example, when you can’t find an open prospect for telescopic exercise, you might as well close your eyes 10