Old Li is a retired teacher, before work, every day to prepare lessons to read the paper is a daily routine, after retirement daily reading the newspaper will also become a habit. Neighbors will mention a common nickname – “three-eyed Lee”, because the old Li usually have three pairs of glasses, one pair to look at the distance, a pair used to read books, a pair is specifically used to look at the computer. But always with three pairs of glasses is also quite inconvenient, sometimes panic out wearing the wrong glasses, but also let the old Lee difficult. He thought, if there is a pair of glasses can see both far and near how good it would be. The idea of the old Li seems to be pie in the sky, but there is really a glasses can meet his requirements. Chen Yan, deputy director of the optometric treatment center of Zhejiang Eye Hospital Hangzhou, told reporters that many people after the age of 40 will produce the phenomenon of “presbyopia”, which we often say “presbyopia”. As the number of people in this category increases, a kind of progressive multifocal lenses (referred to as “progressive lenses”) came into being. Chen Yan introduced the so-called progressive multifocal lens, which is a collection of different refractive correction prescriptions to the same lens, so that the lens can form multiple focal points. The upper middle area is the distance zone, the lower inner area is the near zone, and there is an “aisle” from the distance zone to the near zone, called the “progressive zone”. This zone has a certain length and width and increases gradually from top to bottom. It is because of this special lens structure that it is able to meet the requirements of clarity of objects at different distances, from far, medium and near, which is not possible with other lenses. Many people may be concerned about the appearance of a lens with so many focal points. ”This is not a concern, because the gradient lens is the same as a single light lens, so you can’t see the line of change in prescription. Not only the appearance is beautiful, but also can effectively protect the wearer’s age privacy, not to let people see that is a presbyopic lens.” Chen Yan suggests, because the gradient lens lens change is gradual, will not produce bifocals, triplet lenses and other lenses caused by the “like jump phenomenon”. The gradient lens test is equipped with a delicate gradient lens is suitable for all people? Chen Yan said, the gradient lenses are suitable for most of the old vision wearers, which is ideal for people who have a certain need to work in the middle and close distance, expect beautiful and willing to accept new ideas. However, the fitting of these glasses is still very delicate. In the prescription, first of all, on the basis of being able to accurately see things near and far, according to the degree, face shape, wearing habits and other information on the frame to make targeted adjustments; and then by experienced physicians for the wearer single eye pupil height, pupil distance and other fine eye parameters measurement, in order to customize a suitable prescription for progressive lenses. As a comprehensive problem-solving high-tech product, progressive lenses require the wearer to be mentally prepared to wear lenses. In the early stage of wearing progressive lenses, some people will feel fine to see far and near in a stationary state, but dizziness and swaying sensation will occur when they are in motion, which will require an adaptation period of one to two weeks. Chen Yan suggests that the wearer first start to adapt from a stationary state (such as watching TV, reading books, etc.), then transition to a small range of walking around the room, and finally try to go outdoors or in sports, driving. At the same time, gradient lenses are more expensive than ordinary presbyopes because of the special construction of the lenses and the difficulty of fitting. The elderly friends should not believe in some irregular opticians in the launch of “low-cost gradient lenses”, wearing irregular gradient lenses may affect vision and eye health.