Resin lens products appeared in the 1950s of the last century, and entered China after 1990, because of its safety, light weight, beautiful and comfortable advantages, it is quickly favored by consumers. At present, the application ratio of resin lenses in the market has far exceeded that of cheap eyeglasses near me lenses, and the market share has exceeded 90%. China has now become the world's largest producer and exporter of resin lenses.
In the first national supervision of resin lenses just ended a few days ago, the State Administration of Quality Supervision and Inspection of 80 batches of corrective resin lenses from 80 enterprises across the country, the results show that 15 batches of products do not meet the standard provisions, the unqualified rate reached 19%. Testing agencies revealed that the overall quality of resin glasses lenses on the market may be even lower than this figure. So, what are the quality problems of resin lenses? What kind of impact will it have?
The nominal index of refraction makes consumers spend wrong money
The level of refractive index has no direct relationship with the performance of the resin lens, mainly determines the thickness of the lens, and then affects the comfort level, which is an important indicator that must be marked by the mandatory standard. However, in the current resin lens market, refractive index and price have a great correlation, high refractive index lenses because thinner, more comfortable to wear, the price is about 1000 to 2000 yuan, medium refractive index resin lenses about 500 yuan, and low refractive index lenses only about 200 yuan.
At present, the resin lenses on the market are mainly low refractive index of 1.499, medium refractive index of 1.56 and 1.60, and the amount of high refractive index resin lenses above 1.67 is relatively small. The nominal refractive index of some of the resin lens samples tested is about 1.56 to 1.60, but the test found that there are 7 groups of samples of the refractive index project unqualified, some of the nominal high refractive index of the resin lens, in fact, the refractive index is only about 1.50, or even lower, such products virtually let consumers spend money.
High-end production technology and products are still short board
According to expert analysis, although the production of resin lenses in China is large, it lacks high-end production technology and products. It is understood that the raw materials of resin lenses and the equipment for adding hard film are imported from abroad, and the processing technology used in high-end products is also from abroad. The low-end of many domestic manufacturers' own production technology has seriously reduced the quality and reliability of resin lenses, and behind the "elevated" refractive index of some enterprises leading to unqualified products, the refraction is actually the fact that the production technology is insufficient. In addition, the lack of production management and factory inspection ability is an unavoidable factor leading to the failure of resin lenses.
How to make more high-quality resin lens products go to domestic and foreign markets in the future? Experts believe that while gradually improving the level of scientific and technological innovation of China's production enterprises, we should strictly control the production, management and inspection of the manufacturers themselves, especially strengthen the training of professional talents, and inject more high-quality connotations for the title of the world's largest producer of resin lenses.
