About the early domestic anti-reflection coating lens
Chinese coated lenses appeared in the mid-1980s. At that time, Europe (such as France and Germany) and Asia (such as Japan, Singapore, and Taiwan) had already launched coated lenses to the market, and the grade of lenses was evaluated based on the quality of the anti-reflection effect. Among them, Germany and France were the two leading countries in technology. Technically, the use of French original film material (referred to as H2) can reduce the effect by 99.98% (refers to the light transmittance, the same below). Almost you can not see the reflection, but the material is expensive. Therefore, the coating lens which is currently used in the world is born. The anti-reflection effect is controlled at about 98%, so the coating cost is greatly reduced. And it is accepted by consumers because it presents various colors, especially green. At the same time, because at the same time, it can be easily distinguished from non-coated lenses. It can reflect the high-grade film lens, and it is accepted by the sales staff.
What to consider when buying eyeglasses?
The size of the frame should match the pupil distance so that the edge thickness of the lens is thinner and more comfortable to wear. The size should be proportional to the size of the face. The upper edge should not be higher than the eyebrow and the eyebrow should not be visible in the lenses. The shape of the frame should match the shape of the face and skin tone to meet aesthetic requirements. The rectangular face should choose a circular arc or arc transition frame. An inverted triangle face shape should choose one with a lower wide edge.
How to Choose Glasses for Big Heads?
In this section, we will show you how to choose an eyeglasses frame for large heads. If you do not know how to choose, keep on your reading to find some solutions.
Rectangular frames: Rectangular frames add angle and can slim down the appearance of a larger head. So, if you have a big head, try the rectangular frames glasses.
Oversized frames: if you have a big head, the oversized frames would be a good choice. Oversized glasses will balance out your larger features.
Wayfarer frames: whether your style is retro or geek chic, you will find a perfect fit in trapezoidal wayfarer. The thick angular frames offset rounder cheeks and draw attention down from the forehead. So, if you have a large head, try this style.
When choosing glasses for large heads, you should also find the right shape and color for your signature look and style. While there are a lot of glasses styles for big heads, you should consider glasses with long enough temple length, the length between the hinge of your frames and where they bend around the ear. This measurement is critical for overall comfort, especially on your temples and near your ears.
So, from the above information, you have learned how to choose glasses for big heads.
Refractive index of spectacle lens
It is generally believed that the higher the refractive index, the better the spectacle lens. Such spectacle lenses are relatively thin, and of course, the price is a bit expensive. When the refractive index increases, the direction of the light entering the lens will change greatly, the focus will move to the lens, the focal length will be smaller, and the diopter will become larger. In order to keep the diopter unchanged, it is necessary to reduce the curvature of the lens, that is, to reduce the curvature of the mirror surface, so that the thickness of the lens can be reduced. This is why the larger the refractive index, the thinner the lens is. Under the same premise of other things, the larger the refractive index, the thinner the lens, the lighter and more beautiful the lens, and the higher the price, but the larger the refractive index is not the better.
How to adapt to progressive lenses?
People who are prone to motion sickness or have inner ear diseases may suffer dizziness, nausea, vomiting, and other symptoms due to their inability to tolerate the slight deformation of the visual objects, so they need to pay more attention when wearing them. For people who have not worn reading glasses before, it is not recommended to wear graded multi-focus glasses directly because their eyes will not be able to adapt quickly.
Although glasses are the tool that corrects myopia, a lot of people like to dress up fashion with it now. Men's fashion frames allow you to express your taste and fashion sense and can increase your appearance and image. An eyeglass frame is an important part of a pair of glasses, mainly playing the role of supporting the lens. While the beautiful appearance of the eyeglass frame can play a certain role in aesthetics. Handsome frames add points for appearance.
GlassesUSA lenses
GlassesUSA provides a variety of lens options, including UV and anti-glare filter coatings, which may reduce eye strain from digital device use. The freight is included. Rush Shipping can charge a small fee. This is good for people who desperately need new glasses or contact lenses.
