Abstract: in the adolescent stage, due to a large number of long-time near sighted homework, environmental factors become the main cause of myopia, and improving students’ learning environment and close eye use can play a role in preventing and treating myopia., Myopia is a common disease that seriously endanger the eyesight of teenagers. The prevalence rate is 25 to 30%. In recent years, the incidence rate has been increasing, and the age of onset is ahead of schedule. How to prevent and treat myopia and prevent the development of myopia is an important issue in the world. Although there are many methods to treat myopia, there is still a lack of effective methods. The myopia regression lens starts with controlling and delaying the increase of myopia degree. According to the original myopia degree, the compound lens of positive additional lens and prism is added in front of both eyes for reading and learning, so as to solve the contradiction between adjustment and collection during close-up operation, and realize the viewpoint of low degree convex lens adding base inward prism to control myopia and the theory of binocular image prevention and treatment of myopia, The relationship between regulation and set is fully alleviated. It greatly meets the effective condition that the treatment amount is greater than the near eye amount, Convert near sight to far sight The complex instrument structure of (seeing near equals looking far) is simplified into a pair of glasses structure, which is convenient and practical. Cases – 52 myopia patients with binocular diopter below 3.00ds and aged 9 ~ 18 years are randomly selected as the treatment group, including 18 cases of 0.25 ~ 1.00ds, 20 cases of 1.00 ~ 2.00ds and 14 cases of 2.00 ~ 3.00ds; 20 males and 32 females wear myopia regression lenses. Another 52 patients with similar age, sex and diopter were selected as the control group. The patients in the two groups underwent routine ophthalmic examination, excluding other ocular diseases, routine naked eye vision examination and objective optometry to detect the diopter., Methods: the axial length of both eyes was measured by bscanciescan type A / B ultrasound made in France, the corneal curvature was measured by topconophthalmeter OM4 corneal curvature instrument made in Japan, and the diopter was measured by topcon8000b computer optometry combined with manual examination; Age < 12 years, 10 g / L atropine eye ointment, 3 times a day, for 3 days; Over 12 years old, the pupil was mydriatic optometry with 5g / L compound tropicamide, the diopter was determined by subjective refraction, and the visual acuity with glasses reached 5. 0 shall prevail. Fill the above results in the self-designed form. The treatment group used myopia regression lenses provided by Aotong technology company, and selected different types of myopia regression lenses according to their instructions; The myopia frame correction glasses were worn for short distance eyes ≥ 2H every day, and the myopia frame correction glasses were worn for long distance eyes, and the myopia frame correction glasses were worn for the control group. The visual acuity of the two groups was followed up once a month. Efficacy criteria: a effective criteria: naked eye visual acuity decreased by 2 lines, accounting for 26% of the total number of this group. In the control group, 10 cases with naked eye visual acuity decline 2 lines, accounting for 81% of this group. The difference between the two groups was statistically significant. Compared with the change of myopia diopter in the treatment group and the control group, the diopter in the treatment group increased Add 0.50ds, accounting for 27% of the total cases in this group. The total effective rate in the control group was 34.6%, and 34 cases (68 eyes) with diopter increase > 0.50ds, accounting for 65% of the total cases in this group. There was significant difference between the two groups (P < 0.01). In the treatment group, the axial length increased by 0.17mm in 17 cases, accounting for 44%; in the control group, the axial length increased by 0.17mm in 22 cases, accounting for 42%. There was no significant difference between the two groups Myopia is a common disease that seriously endanger the eyesight of teenagers. The prevalence rate is 25 to 30%. In recent years, the incidence rate has been increasing, and the age of onset is ahead of schedule. How to prevent and treat myopia and prevent the development of myopia is an important issue in the world. Although there are many methods to treat myopia, there is still a lack of effective methods. The myopia regression lens starts with controlling and delaying the increase of myopia degree. According to the original myopia degree, the compound lens of positive additional lens and prism is added in front of both eyes for reading and learning, so as to solve the contradiction between adjustment and collection during close-up operation, and realize the viewpoint of low degree convex lens adding base inward prism to control myopia and the theory of binocular image prevention and treatment of myopia, The relationship between regulation and set is fully alleviated. It greatly meets the effective condition that the treatment amount is greater than the near eye amount, The complex instrument structure of transforming near sight mark into far sight mark (seeing near equals looking far) is simplified into a pair of glasses structure, which is convenient and practical.
Cases – binocular diopter of 3 was randomly selected. Under 00ds, 52 patients with myopia aged 9 ~ 18 years were used as the treatment group, of which 0. 25～1。 00ds was 18 cases, 1. 00～2。 00ds was 20 cases, 2. 00～3。 00ds was 14 cases; 20 males and 32 females wore myopia regression glasses. Another 52 patients with similar age, sex and diopter were selected as the control group. The patients in the two groups underwent routine ophthalmic examination, excluding other eye diseases, routine naked eye vision examination and objective optometry to detect the diopter.
method – the axial length of both eyes was measured by bscanciescan model a / B ultrasound made in France, the corneal curvature was measured by topconophthalmeter OM4 in Japan, and the diopter was measured by topcon8000b computer optometer combined with manual examination; Age < 12 years, 10 g / L atropine eye ointment, 3 times a day, for 3 days; Over 12 years old, the pupil was mydriatic optometry with 5g / L compound tropicamide, the diopter was determined by subjective refraction, and the visual acuity with glasses reached 5. 0 shall prevail. Fill the above results in the self-designed form. The treatment group used myopia regression lenses provided by Aotong technology company, and selected different types of myopia regression lenses according to their instructions; Daily short-range use of glasses ≥ 2h, long-distance use of eyes with myopia frameThe control group wore myopia frame glasses for correction. The visual acuity of the two groups was followed up once a month. Efficacy criteria: a effective criteria: naked eye visual acuity decreased by < 2 lines compared with that before treatment (using the national standard logarithmic visual acuity chart) is effective; the increase of myopia degree is less than 0.50D before treatment; the increase of eye axis length is less than 0.17mm; the increase of corneal curvature is less than 0.50D. B invalid standard: the decrease of naked eye vision is more than 2 lines; the increase of myopia degree is more than 0.50D before treatment; the increase of eye axis length is more than 0.17mm; the increase of corneal curvature is more than 0.50D.
results
Comparison of naked eye visual acuity changes between the treatment group and the control group 39 cases with naked eye visual acuity decreased less than 2 lines of visual targets in the treatment group, with a total effective rate of 74%, Among them, 5 cases (10%) had different degrees of improvement in naked visual acuity compared with that before treatment; 13 cases had visual acuity decline > 2 lines, accounting for 26% of the total number of this group. In the control group, 10 cases had naked visual acuity decline 2 lines, accounting for 81% of this group. The difference between the two groups was statistically significant.
Compared with the change of myopia diopter in the treatment group and the control group, the diopter in the treatment group increased by 0.50ds, accounting for 27% of the total cases in this group. The total effective rate in the control group was 34.6%, and 34 cases (68 eyes) with diopter increase > 0.50ds, accounting for 65% of the total cases in this group. There was significant difference between the two groups (P < 0.01).
The length of ocular axis in the treatment group and the control group increased 0 in 17 cases. 17 mm, accounting for 44% of this group. The length of ocular axis in the control group increased 0. 17mm, accounting for 42% of the total. There was no significant difference between the two groups. The change of corneal curvature in
and
treatment group was more than 0. There were 33 cases of 50D, which was 64%. The change of corneal curvature in the control group was > 0. There were 28 cases of 50D, 54%; There was no significant difference between the two groups.
discussion
at present, it is considered that the development of myopia is mainly related to genetic factors and the reduction of long-time close eye use and corresponding outdoor activities. The refractive state of human eyes is dominated by genetic and environmental factors. In the adolescent stage, due to a large number of long-time near vision work, environmental factors become the main cause of myopia, and improving students’ learning environment and close eye use can play a certain role in preventing and treating myopia. According to different diopters, the myopia regression mirror loads the base inward prism on both eyes, which can reduce the collection of eyeballs and relax the adjustment when looking at near objects, so as to make both eyes look far in the near loop mirror, so as to reduce the changes of factors related to the development of myopia related to near reflection. In theory, myopic regression lens has solved the problem of myopia development caused by long-term near sight, and alleviated the burden of eye adjustment caused by near sight. Therefore, myopic regression lens can delay the occurrence and development of myopia.
by measuring the changes of ocular axis length, it is confirmed that the development of myopia axis length is the main factor for the formation of myopia. After wearing myopia regression lens, the growth of ocular axis is slower than that of the control group. The specific reason may be that the excessive collection of eyeballs is reduced during myopia, which reduces the systolic pressure of internal rectus muscle and reduces the growth of ocular axis and reduces the control of myopia. Dunphy pointed out that the extraocular muscle can press the sclera when the eye is over radiated, and the eyeball is easy to elongate; The regression mirror is based on relaxing the function of intraocular and extraocular muscles when looking at near objects, so as to delay myopia. There was no significant difference in ocular axis and corneal curvature between the two groups, which may be related to the short observation time and compliance, which needs further observation and research.
in the change of naked visual acuity, because naked visual acuity is greatly affected by subjective factors, according to the observation, the degree of pseudomyopia is generally 0. 25～1。 Between 50ds and > 2. No cases of pseudomyopia were found in 00ds. The visual acuity of naked eyes decreased by < 2 lines, accounting for 74% in the treatment group; The dried meat floss of some patients also increased to different degrees during the wearing of myopic regressive lenses. The reason for adjusting the relaxation was to adjust the relaxation of the patients after adjusting the spasticity, and to improve the naked eyesight.
to sum up, myopia regression lens can improve the naked vision of patients with spastic myopia and delay the occurrence and development of myopia.