The original intention of progressive multifocal lens design is to provide a natural, convenient and comfortable correction method for presbyopia patients. Wearing progressive lens is like taking pictures with a camera. A pair of glasses can not only see far away, but also see near and middle distance objects. Therefore, we describe progressive lenses as “lenses that can zoom”. After wearing them, a pair of glasses is equivalent to using more glasses.know online glasses Our growth has to go through many hardships, but entrepreneurs are never afraid and boldly move forward. https://dillydollaroptical.com/
Recommended reading: fitting progressive lenses for middle-aged and elderly people, you should first understand these problems!
As they get older, mirror friends will find that their eyes are good, but they are not nearsighted. After 45 years old, they can’t see clearly when they read books, newspapers and mobile phones, or they feel tired after reading for a while, so they need reading glasses. At the same time, the mirror friends who used to wear myopia glasses also found that it was no problem to read books, newspapers and mobile phones with glasses. After the age of 45, they had to take off their glasses to see clearly. This is because with age, the adjustment ability of the lens of the eye to regulate muscle aging has decreased, which is called presbyopia.
After presbyopia, you will face a problem.
1. People who are not nearsighted
You need to wear reading glasses when you are near, and you need to take them off when you are far away. If it is necessary for teachers or some jobs, you have to put them on-off-put them on-off again, which is very inconvenient. You often need to carry reading glasses with you, and you have to put several pairs of reading glasses everywhere in your home office. Because you take them off once, you often throw them around and they are crushed, and sometimes you can’t find them.
2, people with myopia.
There are two kinds of people with myopia.
One is within 400 degrees of myopia. This kind of moderate and low myopia can be seen by directly taking off your glasses when you are near, and then putting on your glasses when you are far away, and you should keep putting on-taking off-putting on-taking off again.
The other is that if the myopia degree is more than 500 degrees, or even thousands of degrees, you should also take off your glasses, but after you take them off, you can see them very close to your eyes. For example, if you look at your mobile phone, you must put it next to your eyes. This is because there is too much difference between the eyes and the head-up state after taking off the glasses. Generally, reading a newspaper or a mobile phone is about 33cm away from the eyes, which requires an adjustment force of +3.00DS, that is, it is just in the head-up state when the myopia is reduced by 300 degrees. When the myopia is reduced to offset too much, the distance will be reduced before you can see. This situation will be more troublesome than the first two feelings.
Progressive multifocal lenses, also known as progressive lenses, have multiple focal points on one lens. According to the focus, lenses can be divided into monofocal lenses, bifocal lenses and multifocal lenses. Our most common lenses are monofocal lenses, which have only one luminosity; Bifocal lenses are bifocal lenses, which were used by many elderly people to solve the problem of seeing far and near at the same time, but because of their own major shortcomings and the popularity of progressive multifocal lenses, bifocal lenses have been basically eliminated; Multifocal lenses, as a milestone in the history of lens development, will also be the main direction of research and development and market popularization for scientists in the future.
Nowadays, scientists have made corresponding research on multifocal lenses according to the eye use and physiological characteristics of people of different ages, and finally they are divided into three categories:
1. Juvenile myopia control lens-used to slow down visual fatigue and control the development speed of myopia.
2. Anti-fatigue lenses for adults-for teachers, doctors, people who use computers too much at close range, so as to reduce the visual fatigue caused by work.
3. Progressive film for middle-aged and elderly people-used for a pair of glasses for middle-aged and elderly people to see far and near easily.