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.
What is hard coating on lenses?
Lenses are mainly added in two kinds of film: anti-reflection film and hard film (and some manufacturers produce anti-fogging film and mirror film, but not common). The anti-reflective film is mainly by coating the front surface of the lens with multiple layers of transparent materials with different refractive index and thickness to reduce the excess reflected light on the surface of the lens, by using the principle of light interference. The film can be applied to both glass and resin lenses. The way of hard film plating is usually a soaking process. After many times of soaking and cleaning, soaking in an organic solution containing ultrafine silicon element for a certain time, and then keeping it at a certain temperature for 4-5 hours, the fixed polymerization process of the film has been completed. The surface wear resistance of CR-39 coating can be increased by 2-4 pH, which is similar to the hardness of optical glass lenses.
One of the first people credited with inventing glasses was an English friar in the 13th century, Roger Bacon. In his Opus Majus (c. 1266), he outlined the scientific principles of the use of corrective lenses. Some writers believed that monks or friars possessed secret knowledge about glasses, which they later disseminated around the world. Most famously, William Molyneux wrote in his Dioptrica Nova (1692). Unfortunately, there is no evidence that Bacon ever applied his theoretical knowledge of perspective (optics).
What Are Bifocals?
There are several kinds of lenses available in the market. Now, there is a kind of lenses by stacking two different kinds of lenses together and they are called a bifocal lens. Bifocal lenses are lenses with lines separating two different prescriptions. There is a presence of a distance lens at the top and the lower part has a lens that can be used to view the objects placed nearby.
Bifocal lenses are designed for people who have presbyopia, a condition in which the person can’t see the nearby placed objects. Presbyopia is an age-related condition, often occurred when people are over 40 and people often have blurred vision.
At the same time, there are different types of bifocal lenses present and they provide the same user which is the lower part of the lens is used to view the nearby objects or to do work related to reading and writing while the upper part of the lens is used to view the objects placed at a faraway distance or to do an activity like driving.
So, in the following section, we will show you the different types of bifocal lenses.
Sunglasses For Different Face Shapes
The round face is what we usually call the babyface. The facial lines are relatively round. What kind of sunglasses is suitable for people with this face shape? First of all, you cannot choose a large lens. It does not mean that a large lens can cover a big face. You should choose a dark square lens. A round face and a round frame are both enemies. And putting them together will make a person's face look rounder, so try to avoid round frames.
For the square face, the cheekbones and the angle of the mandible are relatively square, and the chin is shorter and well-defined. This kind of face shape must first avoid square frame sunglasses because it will make the face wider. You can choose dark square round sunglasses and cat-eye sunglasses, you can also choose a long and narrow line of aviator sunglasses, the width of the frame is slightly larger than the width of the face.
The long-faced people should choose big sunglasses that can cover the face, and shorten the face. Also choose a darker color, which has a good occlusion effect. The Aviator sunglasses are the most friendly style for people with long faces.
The oval face is also the most popular oval face, the traditional beauty face. The young lady with this face shape can choose sunglasses at will. There are no defects to cover, so you can choose boldly and safely. But don't choose which ones are particularly exaggerated, which are too eye-catching.
The best way to choose sunglasses is to go to the optician to try them on. According to your own preferences, try a variety of styles so that it is easier to see which one is more suitable for you. There are a lot of sunglasses for us to choose from. In order to enhance our beauty, we must choose the most beautiful sunglasses that suits us.
Clean your glasses correctly.
The dust of the lens will be washed (lightly), and then use a neutral detergent (cleaner) to clean. You can also buy professional glasses cleaning fluid, finally clean by water, and then use a professional glasses cloth to wipe. If the lens is covered with dust and particles before wiping, it is best to wash it with water and then gently dry it with a cloth.
Optix 55 day/night driving glasses
These glasses are designed to provide anti-glare and UV protection. They have a flexible plastic lens and frame that can be used over prescription glasses. They use polarized lenses to make the image look sharper. They help reduce glare, reflection, and its negative effects while improving and brightening the visual area.