Progressive Lenses
Progressive lenses are the unique invention of our time. Their main advantage is that they allow not only to see clearly in distance, but also in any other intermediate distance! it means that you are comfortable to type text messages on your mobile phone while walking down the stairs you can clearly see stage, you need it to drive a car and go in for sports. And all this in the same glasses!
Progressive lenses have a smooth transition from zone to zone given to read. It lacks a sharp jump in the image inherent in bifocals and gives an additional burden to the eye.
The progressive lens glasses are not visually different from the normal lens. Modern progressive lens does not limit your choice, they can be installed anywhere to the most fashionable frame.
The principle of progressive lenses.
Increased strength progressive diopter lens is achieved by coating the surface of a special lens design, the radius of curvature gradually decreases in horizontal and vertical direction. The transition zone diopters from areas close to the zone for the given area is called the corridor of progression. The corridor of progression is parallel to the nose, expanding into the area of the eyes. Thus, when a person lowers his eyes when he reads, it uses another zone for vision and other diopters when he looks straight ahead. However, there is some degree of blurring of the image in areas of transition from one to another in diopters progressive lenses. This effect can not be eliminated completely. Manufacturers progressive lenses tend to minimize the impact of this effect, and then the patient is gradually adapting to it.
Differences in design of progressive lenses.
The designs of progressive lenses are:
- standard.
- customized.
- individual.
Standard progressive lenses are made to your prescription blanks of the standard progressive lenses. This implies the width of all regions in the progressive lens to be narrower, compared with the individual lenses. This lens "economy" class.
Individualized progressive lenses - one of the lens surfaces has a standard progression of the optical power on the front surface and the other surface of the lens is made of your prescription.
All areas of individualized progressive lenses will be wider than that of a standard that will provide more comfortable and addictive use of such lenses.
This lens "premium" class.
Individual progressive lenses - There are no lenses which are made entirely at your prescription. These lenses also take into account the parameters of the rim, lifestyle, some visual preferences of the user. Zone clear vision in the most extensive of these lenses. You can adapt quickly and easily. The use of such glasses is comfortable. This is "luxury" lens-class. When you order any progressive glasses for proper manufacturing, consultant optometrist must perform the operation at the marked positions of the centers of the pupils in the selected frame. This procedure is a guarantee that the position of the lens in the frame would be, and frame in which the lens will be installed, will provide an opportunity to get them properly installed. Only in this case, the visual acuity for distance, intermediate and near distances will match the expected.
How quickly become accustomed to the progressive glasses?
For quick and easy adaptation for new points of progressive steps, remember a few simple rules and a little practice. After some time, all the traffic you do without thinking, automatically, and enjoy the use of your new progressive glasses:
very important (!):
- Do not use your "old" points under any circumstances;
- if you want to use peripheral vision to the medium and close range, turn his head slightly;
- Practice record and look at objects that are far and near (for example, look through the window and the book in the hands), at the middle and near distances (for example, television and the book);
- If you want to read, holding the book in his hands in front of you, you have to look for the position in which you can see better. By changing a few line of sight since the working distance at the same time it is somewhat longer than the required 40 cm. After a few workouts you'll be able to find the desired position has automatically;
- when you're down or climb stairs, slightly tilt your head down, to not look through the zone for near and through the intermediate zone;
- it is important to understand that glasses with progressive lenses can not cope with such tasks as, for example, long hours of work close with small objects, reading or watching TV lying on the side lying on the couch;
and if you really want to see well, to be modern, active and mobile - you will not be able to adapt to them is not. For any new points need to get used to and learn to see them in a new way.
If you do not wear glasses or contact lenses all the time, it will become very comfortable to have a special progressive lenses for medium and close range. Such lenses are used only at work or at home, allowing you to see comfortably within the room.
Development of the design of progressive lenses always consider the features of the visual needs of users, depending on the profession. So, for those working in the office, the computer requires increasing the area of the middle and working near distances, compared to those that provide continuous wear progressive lenses. So office users and offers progressive lenses. Increasing the refractive them going on special laws, so that the user has the best visual performance and increased field of view, completely sharply sees both the monitor and keyboard, providing greater comfort when working on an intermediate distance corresponding to the distance to the screen.