Myopic reason

Definition myopia - Myopic reason

Myopia is many factors lead. In recent years considerable evidence that environmental and genetic factors involved in the myopic happening: External cause-long time close to see things, make the eye of lost flexibility in subjects lens lens can't recover (than natural thick), then produce myopia.
Myopic hereditary factors: the study considered highly shortsighted parents family. The next generation of myopia higher incidence and have a certain innate tendency of myopia has already been high myopia is even more so. But for general myopia hereditary tendency is not very obvious.

Genetic relationship between

Myopia mainly has 40% is genetic, myopia is high myopia of genetic main genetic, high myopia also sent two kinds of a is physiology sex. One is the pathology sex, if pathology sex myopia, the baby's eyes of myopia has formed possibility, because with the specific familial transmissibility, have the probability, who have high myopia is not the parents of the eyes of his children with high myopia, are not like that, but there is a probability in it, I want to emphasize is, must be pathological high myopia, if is physiology sex myopia 600 degrees, 1000 degrees is not uniform genetic, that is not necessary will be innate. Pathology sex myopia with heritable factors, physiology sex myopia is not a chromosomal factors.

From high myopia genetic principle and chance

Height nearly as autosomal recessive hereditary disease, also is a pair of myopia is the disease genes of virulence genes to come on. If only one of the genes, is the cause, and the other a gene is normal, do not come arranged, just virulence genes carriers. For example, the parents are not myopia, but they are all extreme myopia gene carriers, I don't show myopia in them, but both of them of virulence genes genetic give children, make the child have two myopia gene, so therefore children become near-sighted.
Extreme myopia is the man with extreme myopia (600 degrees or more) with the women, the children, the onset of the opportunity to more than 90%. If myopia is the person that gene combination, children may have half is high myopia, with normal vision and in combination or low-alcohol myopia, children myopia is 1/10 chance of happened.
If are acquired the physiological high myopia, the child's eye health influence is not big, want to make your baby can achieve the development of healthy eyes, must pay attention to the child after child was born in the usual eye health, for example, don't too long time silent distance let children to observe things, including close video, or do some delicate work, such as described and practicing the word, and so on, which can make the child's myopia the likelihood of lower.
Myopic ecological factors: shortsighted occurrence and development of close to the eye with a tight relationship. Teenagers eye is in a growth stage, adjust ability is unusually strong. Khi eye of stretching is larger, reading. Writing and close work, not merely need for the adjustment of the eye function, double eye and cohesion, so the eye to eye muscle put some pressure, as time passes, eyeball rear axle could change before long. Each growth reached 1 mm 3.00 d (likewise is common 300 degrees of said), and of course the myopia most for pure sex myopia, general degree are low, are in the following six d, come arranged in more before and after puberty, progress is slow, someone put this myopia called true myopia, in order to show and pseudo myopia phase difference.

1. With eyes to close the distance. According to relevant information report, teenagers to long-term use eye myopia equal to the reason for the numerous seed. Teenagers of the eyes DiaoJieLi is exceptionally resilient, when books and the distance of the eyes of seven to 10 centimeters when still can see objects, but if often to distant reading, writing will make the adjustment of the eye abnormal tension, which can form inflectional sex (regulatory) myopia, called pseudo myopia. If long-term over adjust, make the subjects can't flexible adjustable, due to excessive regulation and cause FuCou effect is strengthening, make the eye to eye muscle pressure, intraocular pressure, the eye tissues in congestion, plus youth organization and delicate eye, eye QiuBi compression gradually outspread, eyeball rear axle before a longer, more than normal in the formation of the axial nearsightedness, so-called true myopia. Normal reading distance should be 30-35 centimeter.

2. Use eye for too long. Some teenagers reading and writing homework, watch TV, etc for three to four hours without rest, even late into the night went to bed rest, so not merely affect the body healthful, and make the eye burden, eye muscles long time inside and outside is in nervous condition and cannot get rest, as time passes, when to see from a distance, the eyes cannot relax muscles in spasticity, so look afar feel fuzzy and the formation of myopia. Some students had a summer vacation is decreased obviously vision is the cause. Vague claims for reading and writing or watching TV 40-50 minutes should rest a moment to look far away or for a while.

3. Lighting light strong or weak. If the light is too strong, such as sunshine illuminate written etc, can cause muscular reflex, stimulate an eye, make the eye is unwell, harder to see font, on the contrary, the light is too weakly, written lighting is insufficient, the eye cannot see clearly font, head will forward, squat over the books, above two kinds of circumstances are eyes fatigue, eye over adjust or spasm and the formation of myopia (using the lamp that shield an eye can prevent this scenario).

4. At the car or walking reading. Some teenagers make full use of our time, the side walk the road in reading a book or walk reading in the car, so that are bad for your eyes. Because cars in vibration, the body in a sack, eyes and books distance never fixed, plus excellent lighting conditions, increasing the burden of the eyes, often such, could cause a myopia.

5. Lay is reading. Many teenagers like lying in bed reading a book, this is a wicked habit. Because people eyes should keep reading level condition, make the adjustment and set (FuCou) agree, reducing the fatigue of the eyes. If lie reading, two eyes not state level, eye and books of distance not consistent, two eye view the up and down or so are not consistent, the books the intensity of illumination don't smooth, can make the adjustment of the eye strain and easy to move the books practically eyes, so can aggravate burden eyes two to three times, day long form myopia.

6. Lack of sleep. When the lack of sleep, the second day in miserable spirits, giddy, brain no rest adequately, fails to eliminate fatigue, accentuate the eye burden, make myopic happening. Lack of sleep is the cause of formation of the myopia is an important one.

7. That does not comply with the desk. The writer position is not correct. If the desk and chair are too glum, so that TouQian poor, spine bent, and chest compression, eyes adjust relatively nervous. Or high tables and chairs, feet hang loose, lower limb easy swing, can't keep the correct posture, can make the eye fatigue happened, as time passes easily produce myopia.

8. Now, the impact of space radiation. Often watch TV, long time to use the computer. Video Games, incredibly easy to make eye flesh fatigue, can directly cause students to myopia. Today's computer computer is an indispensable course, prolonged operation of dry eye cause fatigue and easy cause myopia, all needs to utilize the proper control of time.

9. Corneal bending degree or lens bending degree before and after the change. this kind of situation more for congenital change, clinical less rare.

10. Malnutrition. Calcium. Zinc. Vitamin etc.