How to correct the refraction of myopic eyes?

Parallel light rays are refracted through the refractive system of the eye, and if the focus is on the retina, it is called an emmetropic eye; If it fails to focus on the retina, it is divided into myopia, farsightedness, and astigmatism, collectively known as refractive error. Refractive error correction methods are divided into the following types:

For some special professions such as athletes and dancers, contact lenses can be considered when they are not suitable for wearing glasses, and for adults over 18 years old, the refractive power of adults over 18 years old has changed by < 50 degrees in the past two years, and corneal refractive surgery can be considered to correct refractive error after a perfect preoperative examination.

The stronger the refractive power, the shorter the focal length. The focal length of the lens for 2D diopter power is 1 2m or 50cm. If you want to know the focal length of the lens, use 100cm, which is divided by the refractive power, and the result is the focal length.

For example, the focal length of 5D diopter power is 20cm. (100cm divided by 5d = 20cm.) The diopter power of a convex lens is indicated by a "+" sign, and the diopter power of a concave lens is denoted by a "—".

1 diopter or 1d is equal to what is often said to be 100 degrees. Power of glasses = diopter power 100. In some optical instruments such as cameras, telescopes, microscopes and other equipment, the difference in vision of each person's eyes when it is inconvenient for users to wear glasses** is taken into account, so they all have diopter adjustment devices.

Therefore, the concept of "diopter" is glasses, such as 200 degrees of myopia lenses with a diopter of -2D, 150 degrees of reading glasses with a diopter of + coastline network security information station, some high-end cameras, in order to facilitate some people with slight myopia or presbyopia, do not wear glasses, and can directly ** the effect in the viewfinder has increased the diopter adjustment device. The diopter adjustment device is actually to add a set of lenses to the camera viewfinder eyepiece, and adjust the position relationship of the lenses through knobs and other means to achieve continuous diopter conversion within a certain range. The range is generally between -3d and +2d.

Since the diopter adjustment range is limited, users with moderate myopia and other conditions beyond this range can separately purchase a dedicated eyepiece adjustment lens. The eyepiece adjustment lens specially developed for myopia users has diopters of -1, -2, -3, -4, etc.; Eyepiece adjustment lenses specially developed for farsighted users have diopters of +, etc. Users can choose the appropriate eyepiece correction lens according to their own visual acuity, and install it in the eyepiece, so that they can shoot with naked vision.

There are generally two correction methods, namely eyeglasses and contact lenses, both of which change the refractive state of the eye through an external concave lens, thereby improving vision.

Reason 1: Thinning of the eyeball skin (looking at blue light electronic products for a long time, the more free radicals will be generated, and the closer you are to the eye, the more acidic waste will be generated.) These two substances cause the gradual loss of the extracellular interstitium of the sclera, which eventually leads to the thinning of the sclera. ）

Reason 2: "Blowing too much" (using the eyes too hard and too close will lead to excessive intraocular pressure, excessive aqueous humor secretion, and too much blowing.) ）

Reason 3: Too little deflation (not letting the eyes rest for a long time, the brightness of the lighting environment is not enough, the pupils become larger, and the angle becomes smaller, the more difficult it is for the eyes to deflate).

Reason 4: Lack of trace elements (Studies have shown that the occurrence of myopia, in addition to congenital genetics, acquired environmental factors, etc., is also related to the lack of trace elements in the body, especially the lack of trace elements such as calcium, zinc, and vitamin A. ）

It should be noted that once it is determined that it is myopia, then it is necessary to correct it in time, wear glasses when you should wear glasses, and then cooperate with the correction of bad eye habits, go outdoors, pay attention to the rest of the eyes, and supplement the comprehensive nutrition of the eyes with Leyan vision nutrients, so that you can gradually correct myopia.

Surgery is a very important measure for refractive error, and it is also the most effective method. There are many surgical methods used for refractive error in China, such as manual lamellar keratectomy, radial keratotomy, etc., all of which can achieve satisfactory results. Through surgery**, the patient's vision can be restored and the patient's glasses can be removed completely.

Correcting myopia should be considered glasses, which can control the increase in myopia, and surgery can also be used**, which can change myopia more directly. Pay attention to eye hygiene, do not use your eyes for a long time, and pay attention to rest.

Glasses** are suitable for patients with mild refractive errors, and are divided into two types: eyeglasses and contact lenses. Eyeglasses are one of the older** methods used in adolescent patients. Contact lenses have their own advantages, but lens cleaning and eye care are particularly cumbersome, which brings a lot of inconvenience to patients.

Hello, according to the situation you described, the child has symptoms of myopia, it is recommended to take the child to the eye hospital for examination to see if it is pseudomyopia. In the case of pseudomyopia, vision can be restored by changing eye habits; If it is true myopia, the vision can only be corrected by wearing myopia glasses to avoid myopia aggravation.

1. Pay attention to the time you spend with your eyes.

Children's eye development is not perfect, the ability to work is low, every time you read or write for an hour, you should let the child go to outdoor activities, do games, look into the distance, or observe the flowers and trees, so that the tense eye muscles are relaxed, eliminate fatigue. In addition, it is necessary to make the child's life regular, have enough sleep, and let the eyes get enough rest.

2. Pay attention to the light of your eyes.

Do not allow your child to read or write in dark light or sunlight. If a 25-watt light bulb is used indoors at night, the distance between the book and the bulb should be within 1 meter. If you use a 60-watt bulb on a stool, the distance between the book and the bulb should be 1 2 meters.

Cloudy days, dusk, weak light in the moonlight, and strong light in the sun are not suitable for reading and writing. When watching TV, it is necessary to maintain a suitable distance, which should generally be 5 7 times the diagonal length of the phosphor screen. The time to watch TV should not exceed 2 hours at a time.

3. Pay attention to eye exercise.

Physical exercise can enhance blood circulation and metabolism, supply more nutrients to the eyes, and enhance the resistance of the eyes, which is an indirect exercise for the eyes. The direct exercise is eye exercises, which is based on the massage, massage, acupuncture and acupuncture acupuncture points of Chinese medicine, combined with jujube Kuanhui medical sports, which is a scientific method to protect eyesight. Parents should learn the basic knowledge of eye exercises, give specific guidance and often urge their children to do eye exercises, and persevere.

4. Pay attention to eye nutrition.

In order to protect children's eyes, children can eat more carrots, animal liver, lean meat, to supplement vitamin A, or regularly supplement the comprehensive nutrition of the eyes with Leyan vision nutrients, and at the same time, it is also necessary to appropriately consume millet, tofu, animal liver and other supplements of vitamin B2, so as to avoid night blindness, corneal malacia, red eyes, dry itching and other symptoms. Eating too much sugar will harm your child's eyesight, so your child's sugar intake should be controlled.

5. Pay attention to regular inspections.

Regular check-ups are due to the fact that children's eye structure, binocular visual function, and intelligence are still in the process of continuous development after birth, and the content of the examination is different at different ages. The usual age of ophthalmologic examination is generally 2-7 days after birth, 42 days after birth, 3 months, 6 months, and 1 year of age, and then once a year. In this way, the problem can be detected early and corrected early, instead of waiting until the vision has deteriorated and there is a vision problem before going for a check-up.

Myopia can only be prevented, not corrected. But myopia, as a refractive state, can be optically corrected with glasses to bring the refraction close to normal and vision to improve or restore. 1.

Lens manipulation: Put your hands on your cheeks and turn your eyes 10 times in the order of up, down, left and right, then 10 times counterclockwise and 10 times clockwise. Find a scene 3 meters away (e.g

calligraphy and paintings on the wall, etc.), at the same time, raise your left hand slightly higher than your eyes and stretch it out (about 30 centimeters of rice with a cluster), see the palm and hand prints clearly, and then see the distant object clearly, as fast as possible between the two to move your gaze, back and forth 20 times. 2.Tuina:

In either a seated or supine position, the eyes are naturally closed, and the acupressure points around the eyes are massaged sequentially. It is required to take the acupoints accurately, the technique is gentle, and the local soreness is the degree. 3.

Distant gaze: Find a grass 10 meters away or hide a green tree: due to the short wavelength, the green image is in front of the retina, which promotes the relaxation of eye adjustment, relaxes the ciliary muscle, and reduces eye fatigue.

Don't squint or blink all the time, distract from distractions, concentrate and gaze intently for 25 seconds to identify the outline of a blade of grass or a leaf. Then place the palm of your left hand slightly above the front of your eye 30 cm and look at the palm prints from the beginning to the end of the eye for about 5 seconds. After looking at the palm prints, gaze at the grass or leaves in the distance for 25 seconds, and then look at the palm prints.

It's an unofficial big brother.

Diopter. When light is shot from one object to another substance with different optical densities, the propagation direction of the light is deflected, this phenomenon is called refractive phenomenon, which means that the unit of the size of this refractive branch is diopter, which is often represented by "d". The diopter size of a lens is equal to the reciprocal of the focal length of the lens, i.e., d=1 f, where the focal length f is measured in the number of meters, if the focal length f'lm, then d=1 diopter; f=2m, d= diopter ( also commonly denoted by m-1.

The diopter power of a convex lens is indicated by a "+" sign, and the diopter power of a concave lens is denoted by a "—". 1 diopter or 1d is equal to what is often said to be 100 degrees.

The function of the eye to refract light is called refraction, and the ability to refractive is expressed in optical power, which is called diopter. The refractive state of the eye when it is not used to adjust is called static refraction, the power of the static refraction of the standard eye. The refractive state of the human eye at the time of use adjustment is called dynamic refraction, and its power is stronger than that of static refraction.

Due to the incorrect refractive light of the eye, resulting in inaccurate imaging in the retina, it is a visual defect, and it is generally necessary to wear the eye, supplement and correct the refractive power of the eye itself through the lens, and achieve the purpose of correct imaging of the retina!

You may have amblyopia, you go to the hospital for a check-up, do a fundus exam, see if there is an eye problem, if not, you may have amblyopia.