The Advantages of Single Vision Lenses
As is well known, single vision lenses can be used to correct your vision so that they can restore your ability to see clearly.
Single vision lenses can boost the overall quality of your life with improved visual health and acuity. Single vision lenses can also help relieve you of eye strain and ensure fatigue and migraines.
Besides, single vision lenses will help to protect your eyes from impact, trauma and common irritants like dust, sand and insect.
What is a good progressive lens?
No matter how close the objects you see, the lenses are guaranteed to give you a clear view. Whether it's working with a computer, using a smartphone or tablet screen, or simply reading the newspaper, it's all about bringing a comfortable feeling for you. At the same time, the lenses have greater contrast and clarity. The lenses have been tested and approved by the wearer to ensure customer satisfaction, including quick and easy adaptation.
How Long Does It Take to Get Used to Varifocals?
When you get a new pair of glasses, you have to get used to them. So, how long does it take to get used to the glasses? Some people only need a couple of days to get used to them while some others may need up to two weeks.
It is normal if you can only see the frame rim of your glasses when you first wear them. The reason for this lies in the brain’s visual center. It needs to adapt the new and greatly improved visual conditions.
Other problems with titanium frames
For the same volume of frames, alloy frames are twice as likely to break as pure titanium frames, and for the same weight, alloy frames break more easily than pure titanium frames.Therefore, some sellers have to add a lot of copper in alloy material and impure titanium material to increase the toughness of the frame, so that the alloy frame is easy to rust, and long-term wear will be eroded because of the salt in sweat.
Titanium alloy
The definition of titanium alloy is relatively broad. As long as it contains titanium material, it can be called titanium alloy. Therefore, the quality and grade of titanium alloy glasses frames are uneven, and the component of titanium alloy has a direct impact on the price of titanium alloy glasses. Titanium alloy glasses are made not to reduce the cost, but to improve the application performance of the material.
Frame Selection of Progressive Sunglasses
Choose a proper frame range. Only if the frame is not very large and beveled, the frame can be very flat. Because the distance from the glazed to the optical center of a progressive multi-focus lens is 19-17 mm, and the distance between the edges of the frame will be no less than 28 mm if the area inside the lens can be used at close range while maintaining the far sighting field.
The life of the color-changing lens
There is a reaction fatigue problem in both compound reaction and bond-breaking ring-opening reactions. Therefore, there is a shackle in the process of discoloration, which is the life of the discoloration lens. Generally speaking, high-quality color-changing lenses can maintain more than 90% color-changing effect after 2 years of use.
