Types of optical lenses (II)
What are the classifications of optical lenses
Dual lens: for patients with myopia or astigmatism, a remote lens is required for looking far, and a near lens is required for looking near. In this way, sometimes he needs to change the mirror repeatedly to meet the needs of seeing far and near Often inconvenient. The binocular lens solves the problem of frequently changing the lens, and makes the far and near vision lenses into a pair of glasses, which is greatly convenient for use. There is a "light jump" phenomenon in the dual lens when it is first worn; There will be a feeling of maladjustment, which requires a short time to get used to.
Resin optical lens:
It is a popular spectacle lens today. It has many advantages, such as light weight, about half of the weight of glass lens, strong impact resistance, good optical performance, and effective ultraviolet protection. The lens can be dyed into various colors. There are different specifications such as 1.49, 1.56, 1.61.1.67 and 1.74. The higher the specification, the higher the price. And the high gear is closer to the mouth.
Acrylic lens: mainly used for sunglasses. This lens can intercept ultraviolet rays and protect eyes.
Polarizer: It is an ideal sunglass. It is suitable for field work, tourism, sports and anglers.
PC chip: the chemical material is polycarbonate, which has been widely used in aerospace and various fields of people's life.
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