There are many types of bifocals.
According to the manufacturing means, bifocals can be divided into separate bifocals, gluing bifocals, fusion bifocals, E-type bifocals, or one-line bifocals. The separation one is a simple type of bifocal lens. Two lenses of different strength were used to make it be in the center of the distal and proximal vision areas.
How to Choose Reading Glasses?
If you need reading glasses when using a computer, you may want to choose a lower reading glasses power. This is because most people view their screen from a greater distance from their eyes than when they are reading a book or a magazine.
However, if you need reading glasses for looking at something very close or very small, you may need a pair of stronger power glasses.
In most cases, when two reading glasses’ powers seem equally suitable, choose the glasses with the lower power. Picking reading glasses that are too string typically will cause more discomfort problems than reading glasses that are a little too weak.
The inadequacies of bifocals
The field of vision is smaller than that of the single vision lens, especially for the close view. For example, reading and reading newspapers need to make it coordinated with the head movement, there are optical defects of image jump and image displacement. There is a boundary, and it is easy to be seen that wearing a bifocal lens exposes age. Bifocals clearly demarcate the near and far regions, affecting appearance and vision. And when far view and close view change, the objects will jump. Because most myopic patients have a lag in the adjustment response, wearing bifocal lenses not only does not delay the development of myopia but has side effects. Therefore, bifocals are not suitable for teenagers to control myopia, and only a few special patients need to wear bifocals.
Can't Use Alcohol To Clean Glasses
Generally speaking, alcohol is not suitable for cleaning resin lenses. Resin lenses are relatively soft and are usually coated with a film. It not only improves the hardness of the lens, but also has more other functions. The lens film is not suitable for cleaning with harsh cleaning agents. As we all know, alcohol has a certain stimulating effect, so it is harmful to the film of the lens.
The Pros of Titanium Glasses
First, titanium is used in its pure form and as an alloy to provide a highly flexible eyeglasses frame. In fact, titanium eyeglasses are flexible. So, they are able to bend without breaking and can return to their original shape.
Second, titanium glasses come with good durability. Titanium alloy metals produce the world’s most durable eyeglasses frames. Choose a titanium frame and it will be nearly impossible to break.
Third, the titanium glasses are extremely lightweight. They are about 40% lighter than the standard steel glasses frames. In addition, due to the superior strength of the titanium frame, the frames can be made thinner making for even lighter frames.
Fourth, titanium glasses have hypoallergenic properties. It is rare anyone experiences adverse skin reactions to titanium frames. There are many other options on titanium frames such as color, texture, and patterns. What’s more, titanium glasses are corrosion-resistant.
So, are titanium glasses worth it? You may have the answers.
How to Tell If Your Progressive Lenses Are Correct?
When you can’t read with your progressive glasses, you can try this way. Hold something you want to read in your hands and lower your look with your eyes. But please note do not move your chin down as you look down. Then look down at something to read but do not lower your chin. Look at something you want to read. Rotate your head to the left and right and right with one eye at a time. If you can read in a rotated position, the reading zone is out of place. If you can’t read at all, the progressive glasses may be wrong.
Computer Protective Glasses
With the popularity of televisions and computers, electromagnetic radiation has become the No.1 killer of vision. The invention of radiation protection glasses is even more popular, and its market is also widely optimistic.
The lens design of the computer protective glasses has no side effects on vision. Refined with a high-tech vacuum ion coating, it can block 0% electromagnetic waves. The lens contains anti-radiation substances and has the function of absorbing positive charges. It can absorb low-frequency radiation microwaves and avoid potential eye fever, headache, fatigue, dryness, and other adverse symptoms caused by electromagnetic wave radiation. The penetration and absorption function of different light can resist radiation and glare, and the user will obviously feel clear and natural vision after wearing it. At present, there are mainly anti-blue lenses and anti-fatigue lenses, which can effectively prevent blue light radiation and relieve eye fatigue.
