Abstract: myopia is divided into refractive myopia and axial myopia. The former is very rare compared with the latter. As the most common type of myopia, axial myopia is that the image cannot fall on the retina due to the lengthening of the eye axis., I. causes of myopia. Myopia is an eye disease. There are many kinds of eye diseases. The most common are myopia, hyperopia, amblyopia, strabismus, astigmatism, etc., which is led by myopia. However, how is myopia formed?, Factors causing myopia: there are many reasons for myopia, mainly in the following aspects., 1. Physiological factors of the causes of myopia: 8-12-year-old adolescents in puberty are in the period of physical development, and their eyeballs are constantly developing and improving. At this time, myopia will be formed if they hinder the normal development of eyeballs. The main manifestations are liver, kidney and spleen function, visceral regulation and nutritional supply imbalance during development., 2. Genetic factors of the causes of myopia: myopia caused by parents’ inheritance. The prevalence of myopia in both parents’ children is 65%, that of myopia in one parent is 45%, that of high myopia in both parents is 100%, and that of high myopia in one parent is 55%. Therefore, protecting our own eyes is equivalent to protecting the eyes of our future generations., 3. Objective factors of the causes of myopia: environmental factors, long-term operation and study in the environment with too strong or too dark light will affect the decline of vision, air pollution, noise, lack of sleep, hearing impairment, lack of green plants, the environment of scenery, lack of distant vision, and intense learning will make the eyes unable to rest and relax, Poor lighting, uncomfortable tables and chairs, white paper color, unclear printing and other factors lead to myopia over time., 4. Dietary factors causing myopia: partial eclipse, sweet food, soft food and spicy food; Acid and alkaline foods are unbalanced, lacking VE, VC, VA, VB1, VB2, calcium deficiency, etc.,
I. causes of myopia
myopia is an eye disease. There are many kinds of eye diseases. The most common are myopia, hyperopia, amblyopia, strabismus, astigmatism, etc., among which myopia is the first. However, how is myopia formed?
causes myopia: there are many causes of myopia, mainly in the following aspects.
1. Physiological factors of the causes of myopia: 8-12-year-old youths are in the period of physical development, and their eyeballs are constantly developing and improving. At this time, if they hinder the normal development of eyeballs, myopia will be formed. The main manifestations were liver, kidney and spleen function, visceral regulation and nutritional supply imbalance during development.
2. Genetic factors of the causes of myopia: myopia caused by parental inheritance. The prevalence of myopia of both parents is 65%, the prevalence of myopia of one parent is 45%, the prevalence of high myopia of both parents is 100%, and the prevalence of high myopia of one parent is 55%. Therefore, protecting our own eyes is equivalent to protecting the eyes of our future generations.
3. Objective factors of the causes of myopia: environmental factors. Long-term operation and learning in an environment with too strong or too dark light will affect the decline of eyesight, air pollution, noise, lack of sleep, hearing impairment, lack of green plants, landscape environment, lack of distant vision, and intense learning will make the eyes unable to rest Relax, poor lighting, uncomfortable tables and chairs, paper color is not white, printing is not clear, and other factors will form myopia over time.
4. Dietary factors of the causes of myopia: partial eclipse, love of sweets, soft food and spicy food; Acid and alkaline foods are unbalanced, lack of VE, VC, VA, VB1, VB2, calcium deficiency, etc.
5. Subjective factors of the causes of myopia: do not pay attention to eye hygiene, such as reading in strong or dark light, playing computers and game consoles for a long time, watching TV for a long time (according to the survey of relevant experts, if you watch TV continuously for one hour, your visual acuity can be reduced by 30%), and stay in the room for a long time without outdoor activities, Lack of exercise and segment practice are all factors causing myopia.
2. What are the symptoms of myopia?
myopia has signal; In fact, the occurrence of myopia has signals. As long as we master the characteristics of myopia, we can easily find myopia in time and prevent the occurrence of myopia. Myopia has the following symptoms and characteristics.
1 vision loss: myopia is blurred in seeing far away, it is difficult to recognize long-distance targets, and likes to squint. Most children do not like outdoor activities because they can’t see far away clearly, but are more interested in indoor activities such as reading and painting, which in turn promotes the occurrence and development of near vision. The near vision of myopia is generally better, the near vision is clearer, but the far vision is blurred.
2. Eyesight fatigue: after reading for a long time, the handwriting will overlap and serial. Look up and look at the object in front of you. It feels like being at ease and floating unsteadily. When some people look at the target from near to far, there will be a brief blur or double shadow in front of them. These are the manifestations of eye ciliary muscle regulation failure, which is caused by eye fatigue. In addition, chalazion, wheat granuloma or facial marginal inflammation occur repeatedly. At this time, although the visual acuity can reach 1. 0, but the Sonata has been “played”.
3. Perceptual hypersensitivity: eye fatigue is accompanied by eye burning, itching, dryness, swelling pain, and severe pain spreading to the deep orbit, even causing migraine, as well as occipital, neck, shoulder and back pain, which is caused by fatigue perceptual hypersensitivity of eye sensory nerves.
4. Flying mosquito illusion: flying mosquito disease caused by vitreous opacity and liquefaction in moderate or above myopia.
5. Systemic neurological disorders: symptoms such as slow response, bad mood, decreased academic performance, sweating, dreaminess, easy burnout, dizziness, loss of appetite and so on. These are the manifestations of central and autonomic nerve disorders caused by eye fatigue, and they are also the information of myopia.
based on the above symptoms, it is concluded that
1 myopia is due to the excessive curvature of the lens and the formation of distant lightThe image of falls in front of the retina. So I can’t see things far away. If you have myopia, you can wear a concave lens to correct it.
2 the formation of myopia is mainly caused by not paying attention to eye hygiene and eye fatigue for a long time, such as incorrect reading posture, close reading, writing, not paying attention to rest, etc. High myopia may also be related to heredity.
it can be seen that the first thing before myopia occurs is not the decline of vision, but the disturbance of the nervous system. The precursory symptoms of myopia first show the symptoms of the nervous system.