How Is Myopia Formed?

Our eye is an optical system, and it is a pinhole imaging optical system, the optical system has a focal length, the focal length and the length of the eye axis just match, a clear image will fall on the retina, see things clearly.  Ancient medical book has knowledge to myopia, call it eye cannot farsightedness, myopia has a lot of different reason actually, the likelihood is concerned with genetic factor, also have certain connection with developmental factor possibly.  

For myopia has known in ancient medical books, called cannot hyperopia and myopia in fact there are many different reasons, may be related to genetic factors, may also have some connection, and developmental factors, but the exact pathogenesis is still is in the process of research, and understand the reasons for the formation of it, to facilitate the treatment of life, myopia is how?  

1.how is myopia formed  

Most myopia has heredity tendency, high myopia belongs to autosomal recessive heredity mostly, and also there is certain race difference, myopia comes on in yellow race body the probability is higher, black basically won't appear myopia.  If long-term close distance uses the eye, the light is too strong or too weak, the eye posture is incorrect, increased the adjustment load of the eye, easy to form myopia.  

2.How should myopia prevent? 

1, reduce the noise in the living environment: expert studies have shown that when the sound intensity is above 90 decibels, the sensitivity of the rods in the retina begins to decline, and the time to recognize weak light response is prolonged.  At levels above 45 decibels, 40 per cent of the pupils dilate. At 115 decibels, light adaptation drops by 20 per cent and colour perception diminishes, so myopia can easily occur.  

2, eat less sweets: sweets are acidic food, if eating sweets regularly will lead to a large amount of calcium consumption in the body, will also lead to the continuous rise of blood sugar, which is the main cause of myopia, so for children who love to eat sweets, parents must do a good job of supervision in life.  

3, get enough sleep: 10 to 13 years old is the peak period of myopia, if this age children lack of sleep, sympathetic and parasympathetic nerve function imbalance, cause the ciliary muscle regulating function disorder, so it may appear obvious phenomenon of myopia, to effectively protect vision, suggest that children at every night should have 9 ~ 11 hours of sleep.