Abstract: the study shows that the incidence rate of myopia in the next generation is high in the two parent families with high myopia, and myopia has a certain genetic tendency. But for general myopia, the genetic tendency is not very obvious., Myopia is also a disease, especially high myopia, which will bring a series of pathological changes to the eyeball, which will seriously affect life, study and work. Therefore, I hope parents pay attention to it. If there is no myopia, prevent myopia. If there is myopia, use scientific methods to control the deepening of myopia and avoid developing into high myopia., Understanding eyeball structure, understanding eyeball – a precise camera, overview of eyeball development, rapid development period: born ~ 3 years old; Ocular axis 16mm ~ 19.5mm (hyperopia), chronic development period: 3 ~ 8 years old; ocular axis 19.5mm ~ 23mm, visual acuity standard, 1 year old: 0.2 ~ 0.25,
Myopia is also a disease, especially high myopia, which will bring a series of pathological changes to the eyeball, which will seriously affect life, study and work. Therefore, I hope parents will pay attention to the prevention of myopia without myopia. Those who have been myopia adopt scientific methods to control the deepening of myopia and avoid developing into high myopia.
understanding eyeball structure
understanding eyeball — a precise camera
overview of eyeball development
rapid development period: birth ~ 3 years old; Ocular axis 16mm ~ 19.5mm (hyperopia)
chronic development stage: 3 ~ 8 years old; ocular axis 19.5mm ~ 23mm
visual acuity standard
1 year old: 0.2 ~ 0.25
2 ~ 3 years old: 0.5 ~ 0.6 (4.7 ~ 4.8)
4 ~ 5 years old: 0.6 ~ 0.8 (4.8 ~ 4.9)
6 ~ 8 years old and above: 0.8 ~ 1.0 (4.9 ~ 5.0)
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fail to meet the above minimum standards, indicating that there may be ametropia
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. Only when the object image falls on the “film” can we see the ametropic state
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of different eye axis lengths under the same corneal curvature What is myopia?
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when the eyeball is adjusted and still, after the parallel light from 6 meters away passes through the refractive system of the eye, its focus falls in front of the retina and can not accurately form a clear image on the retina, which is called myopia.
myopia has blurred far vision and clear near vision. Why is
myopia? According to the research of the
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genetic factors
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, the incidence rate of myopia in the next generation is high in the families with high myopia, and the genetic tendency of myopia has been recognized, especially for high myopia. However, the genetic tendency of general myopia is not very obvious.
environmental factors
(1) too much close eye use: reading, playing computer, playing mobile phone, iPad
(2) bad visual environment: too strong or dark light, bumpy environment reading
(3) bad eye use habits: incorrect writing posture Too close reading distance
(4) too little outdoor sports
disease factors
(1) Marfan syndrome
(2) keratoconus
causes of myopia
the elongation of the ocular axis is the main reason for the development of myopia, Myopia increases by 300 degrees
the axis of the eye is too long – axial myopia, 90%
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corneas are too steep – refractive medium index of curvature myopia
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is too high – lens adjustment ability of refractive index myopia
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is too strong – pseudomyopia (optometry is emmetropia or hyperopia when adjusting complete paralysis)
outdoor activities
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During outdoor activities, the sunlight in contact with children’s eyes and body can promote the human body to secrete more dopamine, effectively inhibit the growth of eyeballs, and thus inhibit the occurrence and development of myopia. Secondly, the light intensity of outdoor sports is high, which reduces the pupil and deepens the depth of field, so as to increase the clarity of visual objects and delay the development of myopia.