Detection of refractive elements, analysis of high risk factors and early warning of myopia

Abstract: the refractive threshold of myopia students has obvious regularity. The hyperopia diopter of students aged 6 ~ 14 decreased with age, and the decline was the fastest at the age of 8 ~ 10. It was + 2.00d in both 6-year-old and 7-year-old groups. The grade difference of each age group from 8 to 13 years old decreased by 0.25D, and that of 14-year-old group was 0.37d. The proposal of refractive threshold provides a judgment boundary for predicting students’ myopia.

modern medical research shows that there is a certain regularity in the occurrence and development of juvenile myopia, which can be predicted and predicted from two aspects: first, the comparison between refractive test value and normal refractive threshold, including three subjective and three objective tests, and the results are analyzed and compared. The second is the biological detection of the five elements of the ocular refractive system. Through the inspection and detection of the above two aspects and the analysis of five high-risk indicators, it can give three levels of early warning of juvenile students’ myopia. Optometry professionals can put forward eye health care opinions and take active intervention measures for different individuals. First level early warning and intervention, But many people have myopia (decreased far vision) students block out the door of myopia and restore normal vision. The second level of early warning and intervention can reduce the degree of myopia or slow down the deepening of myopia. The third level of early warning and intervention can prevent the occurrence of pathological myopia and reduce myopia complications. In short, the monitoring of refractive elements of teenagers and early warning of myopia are the use of precision The accurate instrument carries out regular dynamic detection on children and adolescents of different ages, analyzes the found biological element values of ocular refraction, and makes different levels of alarm and intervention, so as to prevent accidents and reduce the incidence of juvenile myopia. Biological detection and early warning of refractive elements of juvenile myopia will undoubtedly play an important role in reducing the incidence of myopia among juvenile students.

“juvenile refractive element monitoring and myopia warning” interpretation

scientists have found that the refractive threshold of myopia students has obvious regularity for a long time. The hyperopia diopter of students aged 6 ~ 14 decreased with age, and the decline was the fastest at the age of 8 ~ 10. It was + 2.00d in both 6-year-old and 7-year-old groups. The grade difference of each age group from 8 to 13 years old decreased by 0.25D, and that of 14-year-old group was 0.37d. The proposal of refractive threshold provides a judgment boundary for predicting students’ myopia. At different age stages of children’s eye development, regularly monitor the dynamics Static refractive state (six tests in total) is of great significance for early warning and intervention of potential hidden myopia and the prevention of juvenile myopia.

People are born with short eyeballs, only 16.6-17.1mm, and most of them have hyperopia of + 2 ~ + 4D. In 1-3 years after birth, the ocular axis grows rapidly. At the age of 3, the length of the ocular axis is close to 23mm. If the ocular axis increases by 1mm according to geometric optics, it will produce 3.00d myopia. In 3 years after birth, if the ocular axis increases by 6mm, it will produce 18.00d myopia. In fact, there is a very important refractive element in the development of children’s eyeballs, That is corneal curvature. The size of corneal curvature is recorded by corneal curvature radius during biological detection. Every 1mm increase in corneal curvature radius will offset 6.00D myopia. In the three years after birth, the development of eyeball is the growth of ocular axis, while the corneal curvature radius is also growing in matching, basically maintaining hyperopia. From the age of 3 to 10, the refraction of human eyes is developing towards emmetropia, At the age of 10, the development of eyeball was close to that of adult, and the average axial length of eyeball was 23.67 mm.

in the process of adolescent eye development, there are mainly five refractive elements that determine the refractive state of the eye, namely, the length of the eye axis (AL), the depth of the anterior chamber (ACD), the lens thickness (lens), the length of the vitreous cavity (uitr), the radius of corneal curvature and the corneal diopter (CR / K value), especially Al and Al / CR, That is to say, the change and matching of the five refractive elements of a child in adulthood determine whether his eyes are emmetropia, hyperopia, myopia and astigmatism. The changes in the values of these five refractive elements are closely related to the visual environment. During the development of teenagers’ eyeballs, excessive eye use at close range will cause the changes of the five refractive elements towards myopia, especially the axial length (AL) exceeds the normal length, mainly the extension of the posterior segment of the eyeball. The corneal radius of curvature (CR) of the anterior segment of the eyeball changes little, but the Al / Cr value changes, If a file is established from the age of 3, the biological detection of ocular refraction is carried out regularly and dynamically, the refractive element values of all ages are recorded, and scientific analysis is carried out, can we predict whether children will be myopia in the future? How fast does myopia develop? Probability of complications? This scientific early warning and intervention can play an important role in the prevention of juvenile myopia. Survey data show that 10% of primary and secondary school students’ myopia is pseudomyopia and 50% is mixed myopia. Therefore, there is a lot of room for prevention and treatment of students’ myopia. Through primary early warning and intervention, many students who have shown myopia can be blocked out of the door of myopia and restore normal vision. Through secondary early warning and intervention, the degree of myopia of some students can be reduced, or the deepening of myopia can be slowed down. Through three-level early warning and intervention, the occurrence of pathological myopia can be prevented and the complications of myopia can be reduced. Early warning and targeted and effective prevention and intervention measures can improve the prevention and treatment level of students’ myopia and effectively reduce the incidence of juvenile myopia.