The high toughness and heat resistant of binary PLA/PBS based degradable composites were prepared by blending modification of PLA and PBS with maleic anhydride (MAH), glass fiber (GF), plasticizer (ZRJ-121) and other additives. The effects of different modification systems and glass fiber content on the toughening and heat resistance of PLA/PBS alloy were investigated. The results show that the modified PLA/PBS composites have high toughness, and the elongation at break and impact strength of C1 sample can reach 40.36% and 4.4 kJ/m2, respectively. MAH modified composite has higher crystallinity, tensile strength and elastic modulus. And with the increase of glass fiber content, tensile strength has no significant change, and elastic modulus gradually increased, elongation at break and impact strength gradually decreased. The Vi-cat softening point of the modified PLA/PBS composite is close to 120 ℃, and the initial degradation temperature can reach 247.38 ℃, showing excellent heat resistance. In conclusion, MAH modified PLA/PBS composite has excellent toughening and heat resistance properties, which can be used in the preparation of fully degraded glasses frames and broaden its application range.

To investigate the incidence of myopia among rural primary school students in Bijiang District, Tongren City and analyze the effect of outdoor exercise on visual acuity during the day, a stratified sampling method was used to randomly select 1 615 primary school students aged 6～12 from 6 rural primary schools for questionnaire survey and vision screening. Among rural primary school students in this district, the average visual acuity was (4.80±0.21), and the detection rate of myopia was 27.1% lower than the domestic baseline. The mean daytime outdoor activity time (1.96±0.55) h/d of normal vision patients was more than that of myopic patients (1.68±0.52) h/d, and the difference was statistically significant (P2 h/d during the day between the two groups (χ2=44.01, P2 h/d during the week. Increasing the time and frequency of outdoor activities during the day is a simple and effective way to prevent myopia.

The prevention and control of myopia in children and adolescents is very important and urgent now. Exophoria is a common binocular vision abnormality in myopia patients and patients must use the positive image convergence and dispersion compensation for a long time in order to maintain binocular vision, so it is easy to cause visual fatigue or visual tension, resulting in the deepening of myopia diopter in children and adolescents, which has seriously affected the visual health of children and adolescents. In recent years, the examination and diagnosis of binocular visual function in children and adolescents has been paid more and more attention. Based on the Sheard rule and the Percival rule，visual training plan or reasonable palliative prism diopter were determined by using line segment interval analysis method and the visual function parameters of adolescent patients with exophoria, and to develop personalized treatment plan for patients.

Traditionally spectacle assembly parameters are measured manually and are subjected to human errors. It is of great practical significance to use image detection solution for this task. We investigated the precision of the solution based on the single-vision and progressive-power spectacle samples, and designed a glass plate sample to investigate the accuracy of the solution in reference to the film ruler measurement. The results of image detection showed the method had good stability and accuracy, and image detection was automatic and efficient, suitable for batch quality inspection.

With the progress of the times, glasses are no longer just an ornament or a tool for correcting vision. Glasses can combine many high-tech elements such as intelligent science and information technology. For example, with the help of sensors, control equipment and other hardware, and come true communication, health detection, positioning and navigation and other functions, which can bring us more convenience. Analysis of the existing functions of smart glasses, it is elaborated that the key factors considered by users are smart glasses, its weight, battery life, human-computer interaction, wearing comfort, appearance, price, etc. At last, we look forward to their future development and application.

By analyzing the operating environment and current situation of private clinics, the main difficulties and root causes faced by the development of private clinics were identified, and the favorable conditions and potential for the development of clinics were explored. Private clinics should improve their organizational structure, strengthen cultural construction, improve human resource structure, increase marketing, and keep up with the latest national incentive policies. And they will have greater development space by improving patient service.

Compared and analyzed the parameters of common types of 16 different brands of defocus lenses, the future development of prevention and control of myopia defocus lenses was considered. The parameters of 16 different brands of defocus lenses for myopia controlling were investigated, and the defocus lenses were designed and developed according to various types of defocus methods, but the specific optical design principle, appearance and other differences, the relevant parameters of lenses had differences. To standardize the application of defocus lenses in the field of myopia prevention and control, the country needs to issue the relevant design standards, manufacturing standards, quality inspection standards, fitting, assembly standards, lens application evaluation standards and other documents.

Optometry is the core course of optometry, but there are some problems in the teaching process, such as lagging teaching content, lack of practical skills, poor students' autonomous learning ability and insufficient exploration of the ideological and political elements.Therefore, the course requires in-depth teaching reform to meet the needs of the country and industry. This course should adhere to the educational requirements of three comprehensiveness according to the orientation of the school and the characteristics of the course content, put forward teaching reform measures such as updating the course content, integrating the elements of ideological and political education, and reforming the practice teaching form to improve students' comprehensive ability.