Design principle of progressive multifocal lens
For the same piece of the lens, the top is used to see far, the bottom is used to see close. The upper and lower degrees are different.
There is not a sudden change in the distance degree fixed above the lens to the near degree fixed below the lens, but a gradual transition between the two through gradual changes in refractive power, which has special benefits over common bifocals or trifocal lenses.
Clean Glasses Properly
If the glasses are dirty, don't just wipe them with other cloth. If you use some hard cloth to wipe, it is easy to cause scratches in the lens. Generally speaking, the following cleaning methods are all feasible.
1. Use neutral or alkaline cleaning agent. Remember, toothpaste cannot be used as a substitute for the cleaning agent for spectacle lenses. General optical shops also sell lens cleaners in small bottles, which are easy to carry.
2. Go to the optical shop for professional ultrasonic cleaning. General optical shops provide free cleaning services. The ultrasonic cleaning machine can fully clean every gap and groove of the glasses.
3. Rinse the lens with tap water. Hold the frame in one hand and the cleaner in the other hand. Rub it slowly against the lens, and then rinse it off with clean water. Then wipe it with a glasses cloth or let it dry naturally.
In addition to the glasses cannot be cleaned with alcohol, you should also pay attention to their placement for daily maintenance. Try to avoid putting it under high temperature, and avoid oily, smoke, etc. If you don't use them, put them in the glasses case.
Why are titanium glasses so expensive?
Strong and Durable. They are widely used in aerospace technology, jewelry, surgical instruments, and other fields. It is the most progressive material in the eyewear industry. Titanium is a very hard, lightweight metal that is proper for eyeglass frames. With good hardness, high strength, the glasses are not easy to deform. It is not easy to scratch and wear and has good corrosion resistance and plasticity. It has a high melting point, corrosion resistance, and hard electroplating. Titanium can be made into memory metal, which means it can bend and return to its original shape. Hinge is not easy to break, having rust resistance, impact resistance. When it's used in glasses, it fits the bill.If you've ever broken a frame, titanium is possible the best material for you.
An unlimited discount is not reasonable.
5 discount, 3 discount, 1.5 discount, we can see that glasses category discount is lower and lower. But glasses are not consumable, like cell phones, appliances, or even less frequently than they are. Because, unlike consumables, it has an incompressible cost structure. Behind such discounts, there is sometimes the marketing strategy of raising the price of glasses first and then lowering the price.
Why should the surface of the lens be hardened?
Compared with glass lens, resin lens has the characteristics of lightness, safety, and comfort, but resin lens friction with dust or gravel in the process of use, resulting in lens wear and forming scratches. These scratches in the center of the lens can interfere with vision.
Therefore, in order to improve the wear resistance of resin lenses, it is necessary to add a layer of anti-wear film to the surface of the lenses. This is the hard coating technology of the lenses, which is called Hard coating.
Overnight Glasses
Overnight Glasses is created by experienced members of the optical industry. You'll get high-priced lenses, coatings, and prescription glasses approved by the FOOD and Drug Administration (FDA) and the American National Standards Institute (ANSI).
Production, inspection, and customer support are all done by certified opticians in the US with 100% accuracy. Freeform Progressives Lenses designed by Seiko, Transitions Lenses, Trivex Trilogy, Nu Polar Polarized films, even the most basic prescriptions for monopod lenses, are manufactured, assembled, and double-checked in the United States by their certified personnel. The inventory includes prescription glasses and prescription sunglasses from well-known brands such as Ray-Ban, Oakley, Dior, Versace, Salvatore Ferragamo, Dolce and Gabbana (D&G), Prada, Tom-Ford，Burberry Eyewear, and Ermenegildo Zegna are both priced at less than half what other retailers offer.
Transition Lenses Problems
It is not convenient to rely on photochromic lenses when driving. It also may be unsafe if the driver depends on the prescription to see or is legally bound to wear prescription lenses when driving.
Besides, transition lenses are typically the size and shape of regular vision-correction lenses, which allows them to accurately correct the field of vision, but does not account for peripheral areas on either side of the visible range. Sunglasses operate by maintaining very dark glasses that expand over the field of vision and the peripheral with large, oblong lenses that block sunlight from both the front and sides. However, transition lenses are not typically dark enough for heavy sun and cannot block light penetration on the peripheral, leading to people having to resort to sunglasses again.
Of course, there are some benefits of transition lenses and you can click here to learn more.
