What are Trivex eyeglasses online cheap?
Trivex is a resin material developed by PPG in 2001. Originally developed for military use, it was later used in eyeglass lenses. Trivex was originally used for NXT lenses, mainly for sports eyeglasses online such as bicycle and ski goggles, and its most notable feature is impact resistance.
Trivex is often compared to a PC (polycarbonate) lens. While Trivex offers similar impact resistance to PC lenses, it also has advantages in chemical resistance and scratch resistance. In addition, Trivex has a higher abbe value than PC, about 43-45. It is significantly superior to other lenses in managing light scattering. A lower Abbe value may mean that the lens has more chromatic aberration and distortion.
What is the Abbe value? It represents a material's ability to resist chromatic aberration. The higher the Abbe value, the smaller the color difference under the same conditions. The basic principle is that when sunlight is refracted, different colors of light have different refractive indexes, resulting in color dispersion.
What are high-index lenses?
Before we can understand this, we need to understand what the refractive index is. Remove the eyeglasses online cheap, and the numbers 1.49, 1.56, 1.60, 1.67, 1.71, and 1.74 marked on the lens indicate the refractive index of the lens. For myopia correction, under the same other parameters, the higher the refractive index of the lens, the lower and thinner the lens edge, making it lighter.
High-refractive index lenses use materials with high density and strong light refraction. They bend light more efficiently than regular lenses, resulting in thinner, lighter, and flatter lenses.
Most high-refractive index lenses are usually made of various types of plastics. In the past, glass lenses were commonly used, but they had limitations in achieving a very high refractive index without becoming too thick and heavy. With advances in optical technology and materials science, manufacturers can develop specialized plastics with a higher refractive index than traditional eyeglasses online cheap. Compared with traditional glass lenses, plastic can achieve a higher refractive index.