The original intention of the progressive multifocal lens is to provide a natural, convenient and comfortable way of correction for presbyopia patients. Wearing the progressive lens is like taking a video with a camera. A pair of glasses can see clearly far and near. Can see objects in the middle distance. Therefore, we describe progressive lenses as "lens that can zoom." After wearing, one pair of glasses is equivalent to using multiple glasses.

As the age gets older, the mirror friends will find that the eyes are very good and they are not nearsighted. When they are 45 years old, they can’t see clearly when they read books and newspapers, or they feel eye fatigue after looking at them for a while. Tired, I need reading glasses. At the same time, friends who have worn myopia glasses before also found that it is okay to read books and newspapers while reading mobile phones with glasses. After 45 years old, you must take off the glasses to see clearly. This is because the lens of the eye adjusts the muscles of the aging and the ability to adjust, which is called the symptom of presbyopia.

After having presbyopia, there is a problem.

1. People who are not nearsighted

You need to wear reading glasses when you look close, and you have to take off reading glasses when you look far away. If it’s a teacher or some job position, you need to wear reading glasses continuously-take off-put on-and take off. It is very inconvenient. I often need to carry reading glasses with me. I need to put a few pairs of reading glasses everywhere in my home and office, and I often throw them away because they are crushed. Sometimes I can’t find them. occur.

2. People with myopia.

There are two types of people with myopia.

One is myopia within 400 degrees. This kind of low-medium myopia can be seen by taking off the glasses when you are near. When you look far away, you can put on the glasses, and you have to constantly put on-take off-put on-and take off.

The other is near-sightedness of 500 degrees or more, even thousands of degrees. The glasses must be taken off when looking close, but after taking them off, you must look close to your eyes to see clearly. For example, when looking at a mobile phone, you must place the mobile phone next to your eyes. Look. This is because there is too much difference between the eyes and the emmetropia state after taking off the glasses. Generally, reading books or mobile phones is about 33cm away from the eyes, and requires an accommodation power of +3.00DS, that is, 300 degrees offset by the reduction of myopia is just in the emmetropia state. Too much myopia is offset, and the distance will be reduced again to be able to see. This situation is more troublesome than the previous two.

A progressive lens is also called a progressive lens. As the name suggests, there are multiple focal points on a lens. If divided from the focal point, the lenses can be divided into single focal lenses, bifocal lenses, and multifocal lenses. Our most common lens is a single-focus lens, with only one luminosity on the lens; a bifocal lens is a bifocal lens. Many elderly people used to solve the problem of looking far and near at the same time, but due to their own major shortcomings and progressive multi-focus Popularity, bifocal lenses have been basically eliminated; as a milestone in the history of lens development, multifocal lenses will also be the main direction for future research and development and market popularization by scientists.

Nowadays, scientists have made corresponding researches on multifocal lenses according to the eye use methods and physiological characteristics of people of different ages, and finally they are divided into three types of lenses:

1. Juvenile myopia control lenses-used to relieve visual fatigue and control the development of myopia.

2. Adult anti-fatigue lenses-used for teachers, doctors, people who use too much computer at close range to reduce visual fatigue caused by work.

3. Progressive tablets for middle-aged and elderly people-a pair of glasses for middle-aged and elderly people to easily see near and farsightedness.