Common Bifocal Glasses Problems
In this section, we will list some common bifocal glasses problems.
First, it may take a couple of weeks to adjust the bifocal glasses. You may not get used to wearing your bifocal glasses overnight. When you wear the bifocal glasses for the first time, it may be difficult to adapt them.
However, knowing the correct part of the lens to look through is crucial to giving you the vision correction you need, whether it is distance or near vision, for different activities.
To adapt to the bifocal glasses, you had better wear them all day or as often as you can. If you don’t wear your new glasses enough, it can make the adaption period last even longer.
Besides the above bifocal problem, there are other problems with bifocal glasses. The second problem of bifocal glasses could be that the bifocal line is too high and you might lack adequate distance vision. So, the bifocal line could be obvious and it would not be beautiful. However, if you want a pair of glasses without a visible line, you could consider progressive lenses. You will feel older while wearing them, without having to worry about the line through the center of your glasses.
Take Frame material selection seriously.
When choosing a frame, try to choose a light frame. At present, the glass frame material is relatively light titanium, tungsten carbon, TR90, and so on. Now based on the plate spectacle frame, the new plate spectacle frame implements thin processing, so the whole spectacle frame has become light up. You can use rimless light glasses. Usually, the nose pad will leave an indentation, possibly because the glasses are too heavy. Changing some light glasses can improve the problem of indentation of the nose pads.
Why do spectacle lenses fog up?
The fog on the surface of the lens is essentially related to the saturation pressure and water vapor liquefaction. The air is full of water molecules, which are constantly doing irregular movements. When there is no temperature difference, water molecules keep hitting the surface of the lens and will keep bouncing off. The lower the temperature, the slower the speed of movement. Therefore, when water molecules hit the cold lens from the hot air, on the one hand, they move too slowly to fly out in time. On the other hand, because of the relatively low temperature of the lens itself and its vicinity, the water vapor will liquefy. As a result, more and more water will accumulate on the lens and form small droplets, eventually forming a foggy layer. As the lens heats up, the mist evaporates back into the air, and the fog disappears.
Silhouette Racing Collection 5502 BP 4540
With a metal frame and versatile blue, these Contour Racing series 5502 BP glasses will be your favorite glasses. The simple frame design ensures that these glasses are easy to repair. So you can wear it comfortably all day without enduring the endless squeezing and slipping of the substandard frame.
Disadvantages of Plastic Frames
The disadvantage of injection molding material is that most of them have surface spray paint processing. They are not wear-resistant, easy to fade, easy to peel off the paint layer. PC material comfort is poor, and durability is not good. The frames cannot be changed to suit different face shapes. Because of its good elasticity, TR material can not be changed, which means that poorly made lenses are easy to fit into the frame. Plate material is hard, if the change is not appropriate, it will be not comfortable. Acidic material can not match the lens made of PC material, which will cause the lens to crack.
The working principle of driving glasses
The driving glasses are designed according to the polarized angle and radian of the lens and the principle of precision optics. It can only let the beneficial light pass through, and other light sources, like strong sunlight, car headlights, and other light sources are filtered, to eliminate the interference of external light, and avoid the appearance of eye-catching, dazzling, and other situations. That's basically how the driver glasses are designed.
How to measure pupil distance?
You can ask your optometrist for this data, or if you have an extra pair of glasses, please send it to the merchant with your printed order and they will record your pupil distance value from it to ensure that your lenses have an accurate vision center. They will send you your new and old glasses together. The average pupil distance for adults is usually between 60mm and 66mm.