The birth of progressive lenses
In 1907, British optometrist Owen Aves first proposed the concept of progressive lenses and got the first patent of progressive lenses. In 1910, Henry Orford Gowlland designed and made a similar lens in Canada, but technical limitations prevented it from succeeding. In 1959, Bernard Maitenaz, a French optical and mechanical engineer, developed the first progressive lens, which was successfully put into the commercial market for the first time and became a milestone in the history of world optometry. With the development of science and technology, the design of progressive lenses has been greatly developed.
Why do you need rimless glasses?
Traditional full-frame glasses can sometimes make your face look heavy, especially if the lenses are thicker. Rimless glasses can replace heavy frames without weight from the rims. This reduces the pressure on the nose pad, making your face feel lighter and more comfortable.
How to choose frames?
Of course, the best way is to try it on many times. The visual effect is more direct and reliable than trying on. Spend more time and you can find your own style suitable for you.
In addition, where comfort and aesthetics permit, choose the size as large as possible so that the view will be larger. However, there are some optometric parameters that limit the selection of frames. For example, if the pupil distance is very small, choose a size that is too large is not suitable. Try not to choose the product with spray paint on the surface, because durable time is shorter.
You should pay special attention to that TR, plastic steel, stainless steel, wood, β titanium glasses temple may not be adjusted. When trying on, it should be noted that the weight of the lens has not been added to the trying frame, to avoid the problem of discomfort (such as an easy slip of the frame) found after the preparation.
The characteristics of metal material
The material of metal glasses frame chooses some kind of metal material or alloy to make mostly. Most of the copper alloys are treated as the base material and then have surface treatment processing. Then there is the recent rise of pure titanium frames and those made of memory alloy. Metal frames are usually equipped with nose pads, which are movable to accommodate a variety of nasal shapes. The end of the temple is often covered with a plastic cover, not only beautiful but also to protect the temple and skin.
About Glasses Donation
Some enterprises adhere to the quality of survival. They always adhere to the credibility and development of the business philosophy, investing in public welfare undertakings and fulfill their social responsibilities. They donate glasses, have free vision tests, and put forward reasonable love eye care advice according to the results of the test to the public.
What is a drop ball test?
The Drop Ball Test, known as the Basic Impact Test, is an Impact Test administered by the Food and Drug Administration to determine the safety of eyeglasses. Eyeglasses (sunglasses, exercise glasses, near-sightedness glasses, reading glasses, etc.) are a category of medical devices covered by the Food and Drug Administration. When glasses are exported to the United States or put on shelves on Amazon,eBay, and other platforms, they need to be registered by FDA. Besides the product listing, when the product passes the customs, the company may be asked to produce a Certification Statement of Impact Resistance stating that the product meets 21CFR801.410 Drop Ball Test requirements.
What are the benefits of pure titanium frames?
This is a kind of metal material with a titanium content of up to 89%, and the most amazing features of this kind of material are the high melting point, and it can withstand high temperatures.Apart from carbon fiber, pure titanium is the lightest material of all.The overall mass is not heavy, so it does not cause pretty large pressure on the bridge.Meanwhile, it has strong corrosion resistance. Pure titanium glasses are designed ergonomically, so there is no need to worry about deformation or fading even if they are used for a long time.So it is loved by many consumers.
