Which is better between resin lens and PC lens?

summary

Which is better between resin lens and PC lens? When we match glasses, we always encounter the question of "what kind of lens do you want to choose?"; Our resin lens and PC lens sell better. "When you match glasses, will you encounter this kind of problem? What is resin lens, what is PC lens, and what is the difference between them? Loho senior optometrist will introduce you which is better between resin lens and PC lens.

Which is better between resin lens and PC lens?

First, resin is a kind of hydrocarbon secretions from many plants, especially conifers. Because of its special chemical structure and can be used as this latex paint and adhesive, it is valued. It is a mixture of many kinds of high molecular compounds, so it has different melting points. Resin can be divided into natural resin and synthetic resin. There are many kinds of resins, which are widely used in people's light industry and heavy industry, and can be seen in daily life, such as plastics, resin glasses, coatings, etc.

Second, the resin lens is a kind of polished lens synthesized by chemical processing with resin as raw material. Its advantages are: the resin lens is polymerized by diethylene glycol and propylene glycol ester. Light weight, good impact resistance, high temperature resistance, good light transmittance, close to the performance of glass lens, can block ultraviolet. Disadvantages: the surface wear resistance and chemical resistance are worse than glass, the surface is easy to scratch, and the water absorption is greater than glass; the thermal expansion coefficient is high, the thermal conductivity is poor, the softening temperature is low, and it is easy to deform and affect the optical properties.

Third, the general resin lenses are thermosetting materials, that is, the raw material is liquid, heated to form a solid lens. PC film is also called "space film" and "space film". Advantages: light, 57% lighter than the traditional glass sheet, safe, its impact resistance is 60 times that of glass, and it can be used as bulletproof glass when the thickness is 2.5cm. The thickness of CR-39 lens is thin and equal to that of CR-39 lens with refractive index of 1.6

matters needing attention

Refractive index refers to the bending ability of the lens to light, which is the main parameter to indicate the thickness of the lens. At present, the refractive index of resin lens is generally between 1.49 and 1.74. The higher the refractive index is, the thinner the lens is. Generally speaking, over 1.60 is called ultra-thin lens. Therefore, for people with high myopia, the lens with refractive index above 1.60 should be selected.