Who is Suitable for Customizing Progressive Multifocal Glasses

The original design intention of progressive addition lenses is to provide presbyopia patients with a natural, convenient and comfortable correction method. Wearing progressive lenses is just like shooting with a camera. One pair of such glasses can allow you to see distant objects clearly, as well as near objects and mid-distance objects. Therefore, we also describe progressive lenses as "zoomable lenses". After wearing them, one pair of glasses can be used as multiple pairs of glasses.

As people get older, glasses wearers will find that even people with originally good eyesight who have no myopia will start to have blurred near vision when reading books, newspapers or looking at mobile phones after the age of 45, or feel eye fatigue after looking for a while, so they need to wear presbyopic glasses. At the same time, glasses wearers who already wore myopia glasses before also find that it used to be no problem to read books, newspapers and look at mobile phones with their glasses on, but after 45 years old, they have to take off their glasses to see near objects clearly. This is because as people age, the ciliary muscles regulating the lens of the eye age and the accommodation ability decreases, which is called the symptom of presbyopia.

After getting presbyopia, you will face a problem.

1. People without myopia

They need to wear presbyopic glasses for near vision and take them off for far vision. If you are a teacher or hold certain job positions that require frequent switching, you have to keep putting on, taking off, putting on again and taking off again, which is very inconvenient. You often need to carry your presbyopic glasses with you, and have to place several pairs of them around your home and office. Moreover, since you put them on and take them off frequently, you often leave them everywhere, and cases where the glasses get crushed or lost occur from time to time.

2. People with myopia

People with myopia can be divided into two categories,

One is those with myopia less than or equal to 400 degrees. For this kind of low to moderate myopia, you can directly take off your glasses to see near objects, and put them on again to see far objects. You also have to keep putting on, taking off, putting on again and taking off again.

The other is those with myopia of 500 degrees or more, even over 1000 degrees. They also need to take off their glasses to see near objects, but after taking them off, they have to hold the object very close to their eyes to see clearly. For example, when looking at a mobile phone, they often have to hold it right next to their eyes to see. This is because after taking off the glasses, the eye is far from the emmetropic state. Generally, when reading books, newspapers or looking at a mobile phone, the distance from the eyes is about 33cm, which requires +3.00DS of accommodation, that is, it is in an emmetropic state when the 300 degrees is offset by the reduction of myopia. When the offset myopia is too much, the distance has to be further reduced to see clearly. This situation feels more troublesome than the previous two cases.

Progressive addition lenses are also called progressive lenses. As the name suggests, there are multiple focal points on one lens. If classified by focal points, lenses can be divided into single-vision lenses, bifocal lenses and multifocal lenses. The common lenses we see are single-vision lenses, which have only one power on the lens; bifocal lenses are lenses with two powers. In the past, many elderly people used them to solve the problem of seeing both far and near, but due to their own major drawbacks and the popularization of progressive addition lenses, bifocal lenses have basically been eliminated; as a milestone in the development history of lenses, multifocal lenses will also be the main direction for scientific researchers' development and market popularization in the future.

Nowadays, based on the eye use patterns and physiological characteristics of people of different age groups, scientists have conducted corresponding research on multifocal lenses, and finally divided them into three main categories:

1. Juvenile myopia control lenses——used to reduce visual fatigue and control the development speed of myopia.

2. Anti-fatigue lenses for adults——used for teachers, doctors, people who use eyes for long-time near work and computers a lot, to reduce visual fatigue caused by work.

3. Progressive lenses for middle-aged and elderly people——allow middle-aged and elderly people to see both far and near easily with just one pair of glasses.