Why measure the length of the eye shaft for your child?

Original title of  and: why should children be given ocular axis?

in recent years, the prevalence of juvenile myopia is increasing year by year, and the age of onset is gradually advanced.

adolescents will gradually prolong the depth of anterior chamber, vitreous cavity and axial length with the increase of myopia, and the axial length is the most important clinical index to measure the development of myopia.

the eyeball is a sphere. The eye axis refers to the axial distance from the anterior surface of the cornea to the retina along the line of sight. When we were born, the eye axis was only about 17mm, and the length of the eye axis in infancy was 20mm. With age, the eyeball further developed. After that, it increased at a rate of about 0.1-0.2mm every year, and finally reached the adult level of about 24mm.

how does the ocular axis monitor the development of myopia?

myopia is an overall refractive state of the eye, which is the matching degree of all refractive media in the eye and eye axis. In the process of visual development, our ocular axis gradually becomes longer, while the cornea and lens become more and more flat. They coordinate with each other to maintain normal visual acuity. The external light refracts all the way from the cornea to the vitreous body, and the light just falls on the fovea of the macula. If the ocular axis grows too fast, the light can only converge in front of the retina. At this time, you can’t clearly see distant objects, that is, myopia.and

studies have found that if the ocular axis increases by 1mm, the degree of myopia will increase by 250 ° – 275 °, so parents will have such questions. Can I get the degree of myopia by measuring only the ocular axis every time?

in fact, everyone’s ocular axis is different. We can’t infer the degree of myopia by measuring the length of ocular axis. Just like height, we won’t accelerate the growth of myopia because there is no ocular axis. We mainly evaluate the growth rate of myopia more objectively by observing the growth rate of ocular axis.

the development of eyeball is an irreversible process. The ocular axis can only continue to grow or stop, not retreat. Therefore, once myopia occurs, it can only grow or tend to stop, will not reduce, and can not be cured.and

because the occurrence period of myopia in Chinese children is advanced, it is recommended that parents observe the development of children’s ocular axis in advance from the age of 3, and establish children’s refractive development files in advance, so as to make early correction and control it in time.and

will develop into high myopia above -6.00 if measures are not taken in time. Excessive extension of the ocular axis will bring a variety of ocular complications such as retinal detachment, macular hemorrhage, macular hole and glaucoma. These lesions will seriously affect vision and visual quality, and even cause irreversible visual damage.

children and adolescents are the best period to control the growth of myopia. It is an urgent problem to take effective measures and methods to control and delay the progress of juvenile myopia.

click to view the directory: Hu Zhenglin’s book

is an eye visual optics monograph on Optometry and matching of children in China. This book is divided into twelve chapters. It gives a concise and appropriate introduction to children’s refractive and ametropia, and objectively describes the practical knowledge of children’s refractive correction, customization, myopia prevention and visual health. Based on the basic optometry procedure and the visual physiological characteristics of children, this book expounds the optometry problems of children; It also introduces the optical concepts of ametropia, strabismus and amblyopia, and expounds the related refractive correction concepts; It also expounds the refractive correction and visual training of children, introduces the basic concepts and methods of children’s scientific and healthy eye use, scientific and reasonable wearing glasses, introduces in detail the concepts and methods of myopia prevention and control, and puts forward their own understanding and views.and

are easy to understand and practical. The publication and distribution of this book will not only improve the quality of optometry for teenagers, but also play a positive role in the prevention and control of myopia for teenagers and children. It will also become an assistant and friend for optometrists in their work and self-study.and

can be used as desk books for optometrists and ophthalmologists in their daily work. They are also indispensable professional reference books for people engaged in eye visual optics teaching, children’s health workers and students majoring in eye visual optics in their study and practice.

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