What are the Advantages of the Development History of Progressive Multifocal Lens?
1、 Development history of progressive multifocal lens
Owen aves first proposed the concept of progressive multifocal lens in 1907, marking the birth of a new concept of vision correction.
The design of this special lens is inspired by the shape of the elephant nose. People make the curvature of the front surface of the lens continuously increase from the top to the bottom, which can change its refractive power accordingly, that is, the refractive power gradually and continuously increases from the far use area at the upper part of the lens until the near use area at the bottom of the lens reaches the required near use refractive power.
On the basis of previous ideas and with the help of new achievements in design and development provided by modern science and technology, the Frenchman metnatz designed the first progressive mirror with modern concept in 1951, which can be used for clinical wear. After many improvements, it was first put on the French market in 1959. Its innovation in the concept of visual correction made it win the attention of the world, and soon it was extended to the European continent and North America.
2、 Advantages of progressive multifocal lens:
1. )The appearance of the lens is the same as that of a single light lens, and the dividing line of degree change can not be seen. The beauty of the lens protects the wearer's need to keep age privacy, and eliminates the wearer's concern of revealing age secrets due to wearing binoculars in the past.
2. )The change of lens degree is gradual and will not produce image jump. Comfortable to wear and easy to adapt.
3. )The lens degree is gradual, and the change from far vision to near vision increases gradually, which will not produce eye adjustment fluctuations and is not easy to cause visual fatigue.
4.) Clear vision can be obtained at all distances within the visual range. A pair of glasses can meet the needs of far use, near use and middle distance at the same time.
3、 Precautions for progressive multifocal lenses
When matching glasses, choose a large frame. Because the lens should be divided into far, middle and near areas, only a large frame can ensure a wide enough near area. It is best to match the full frame frame, because the larger the lens, the thicker the lens edge, and the full frame groove can cover the thickness of the lens edge.
Generally, it takes about a week to adapt, but the length of the adaptation period varies from person to person. When you are dizzy, you should walk slower.
Since both sides of the lens are astigmatism disorder areas, it is not clear to see the objects on both sides turning their eyes through light. You need to turn your neck and eyes at the same time to see clearly.
When going downstairs, keep your glasses low and try to look out from the far use area above.
Thank you for your reading
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