What do You Know About Progressive Multifocal Lenses?

Although ordinary lenses can basically meet the daily needs of people, with the increasing number of myopia groups, according to different use scenarios, lens manufacturers have designed and concentrated on the functional lenses. For specific groups of people, progressive glasses are produced and used, such as progressive bifocal reading glasses and progressive computer reading glasses. Progressive lenses are a kind of lens composed of multiple focal points and different degrees. Generally, it can be divided into four areas: far use area, near use area, progressive area, left and right deformation area (also known as peripheral area or fuzzy area).

Who is suitable for progressive lenses?

In the actual work, the standard of judging whether a person is suitable for wearing progressive glasses needs to be determined according to the needs of customers. After determining whether the customers are suitable for the crowd, the staff should accurately refract the customers to ensure that they have a proper prescription for glasses. Who can bring progressive reading glasses? The first is that people who have difficulty seeing close range and need to wear presbyopia hope to avoid the trouble of replacing glasses due to hypertension. The second is the wearer who is not satisfied with the appearance of the double or triple lenses. The third group is of people who have just entered the "presbyopia" stage, aged 40-50. The fourth group is the people who exchange views frequently: teachers, speakers and administrators. They particularly need progressive reading glasses with transition lenses. The fifth is public communicators.

Key to progressive lenses: accurate refraction

Compared with single lens, progressive multifocal lenses have their particularity. Therefore, in the process of refraction, progressive multifocal lenses can not only meet the requirements of good vision in the high beam area, but also take into account the actual effect of the near light area, so as to make the whole progressive lens comfortable to wear. At this time, the "high beam accuracy" should be based on the better use of the lower beam, so the myopia of the high beam should not be "too deep", but the far sightedness should not be "too shallow", otherwise, the "too large" of ADD will result in the decrease of the comfort of the lens. On the premise of ensuring that the vision of high beam is clear and comfortable in the actual use range, the myopia and hyperopia of the progressive lens should be as small as possible and the hyperopia should be as large as possible.

Precautions for using progressive lenses

Can't improve the distant vision at will

If the "high beam collimation" is understood as improving the distant vision as much as possible, it will inevitably lead to measures such as increasing the myopia luminosity or increasing a certain amount of astigmatism, which will cause the field of vision in the middle and near light area to be smaller, and the overall comfort of the progressive lens will be worse.

The ADD should not be too large for the elderly with progressive multifocal lenses

For the elderly over 60 years old, due to their poor adjustment ability, the general ADD needs to be large, resulting in narrowing of the middle and near light area and large changes in the image. At the same time, the ability of the elderly to adapt to progressive multifocal lenses is poor, which leads to contradiction. Therefore, in order to ensure the practical use effect of progressive lens and the wearing comfort of the elderly, we should focus on solving the problem of middle and close distance of the elderly. Ensure that the elderly can see the medium font and general objects within 4 meters, can recognize the characters, can see the TV and general objects in the room, and can use the progressive multifocal lens to see the near objects and read freely. Therefore, the elderly's progressive multifocal glasses or multifocal prescription glasses should be convenient, comfortable and practical.

Astigmatism should be small rather than large

The astigmatism and astigmatism axis will change when the near field of progressive lens is used. The astigmatism and the astigmatism axis of lens and human eye are often inconsistent, which will cause problems in the use of near light area. Therefore, the staff should be careful in increasing the astigmatism. When the astigmatism axis is asymmetric, even if the astigmatism is not large, it should be handled carefully to reduce the astigmatism as much as possible.

Use try on pieces whenever possible

Due to the great difference between progressive multifocal lenses and monocular lenses, the effect of progressive multifocal readers on the feeling of each light area and the fusion effect of low beam can only be realized by wearing progressive lenses. Therefore, it is recommended to use trial pieces for fitting.

Progressive lenses are a kind of professional lenses. If you want to know about fitting, you need to check your eyes carefully before you choose. For example, the adjustment ability of eyes, the habits of daily use of eyes, and the position of wearing glasses. In addition, if you have additional requirements, such as going out, you can also wear progressive reading sunglasses and bifocal polarized sunglasses.