There are many options for vision correction. These include glasses, contact lenses, and surgery. If a person has myopia, he can safely use the first, second, and third option. But things are not so simple with presbyopia. This anomaly is a deterioration in vision at close distances, mainly occurs with age. The glasses in this case allow you to read and view small images, but the picture becomes blurry in the distance.
Today, people suffering from farsightedness can come to the aid of progressive lenses for glasses. What it is is described below in the article.
Features
Progressive eyeglass lenses. What it is? These are optical glasses designed according to the principle of multifocality. They provide a clear image at any distance. Existthese types of corrective lenses:
- Single vision. Provides clear images near or far.
- Two-focal. Provide good near and far vision.
- Multifocal (this includes and progressive). Correct visual acuity at any distance.
The latter are particularly unique. They have different optical zones, smoothly passing one into another.
Thanks to this design, a person can wear glasses all the time. He will equally clearly see objects at a distance of several centimeters, meters, tens of meters.
Ordinary glasses with farsightedness bring a lot of inconvenience. If you need to read something while in transport or in a public place, then you need to get them, put them on, then hide them. And so every time. It is also very inconvenient to record something while looking several meters ahead (for example, at a TV or a whiteboard). With age, this situation worsens more and more. Then a person can hardly read a newspaper, hardly begins to recognize familiar faces among passers-by on the street. The price of progressive eyeglass lenses varies, so everyone can choose according to their ability.
Design
Each glass has an upper and lower zone, which differ in diopters, there is a progression corridor between them.
- The upper zone is responsible for visual acuity when looking straight ahead, at a distance of 5 m or more,located at the top of the glass.
- The bottom zone provides comfortable reading. Located at the bottom of the glass, corrects vision when looking down.
- The progression corridor is a transition between two zones. Designed for use from 40cm to 5m.
Views
Distinguish between universal and special progressive lenses. The former are manufactured using standard technology with typical glass curvature. They correct vision at medium distances. The cost of progressive lenses made in Russia (universal) varies from 7000 rubles. up to 10,000 rubles If you choose the production of Germany and France, then the price will increase significantly - 10,000 - 19,500 rubles.
With the help of special lenses, you can well recognize small objects that are close, and large objects that are located at a far distance. In turn, one and the other are further divided into many subspecies. The price for Russian lenses will be approximately 15,000 rubles, and for foreign lenses - 24,000 rubles.
Also, manufacturing companies make optical glasses according to individual parameters. Individual progressive lenses for eyeglasses will have a correspondingly higher price. They significantly reduce the adaptation period and improve visual acuity. European manufacturers set the price in the range of 33,000 - 35,000 rubles, Russian-made lenses will cost a little cheaper - 25,000 - 27,000 rubles.
Contraindications
There are a number of eye diseases for which to useprogressive lenses are not allowed.
- Anisometropia. In people with this pathology, the visual acuity of the left and right eyes differs by more than 2 diopters.
- Cataract. The clouding of the lens can progress rapidly, so stable vision correction cannot be achieved.
- Squint. Eyes are not able to look through a certain area of glass in the same way, so you should not even try to fit progressive lenses.
- Nystagmus. In a person with such a disease, the pupils involuntarily change their size. In this regard, the adaptation period is very difficult.
- Intolerance of an individual nature.
Benefits
The choice of glass of this type provides many advantages. First, there is no need to buy two pairs of glasses (reading and distance). Secondly, they allow you to clearly see objects that are at an average distance. If a person prefers bifocal lenses, then when looking from an object that is close to an object located far away, the so-called "jump" of the picture occurs. This brings discomfort to the eyes. But when choosing multifocal lenses, such problems are not observed.
The selection of points is carried out using a complex computer program. It takes into account not only visual acuity, but also the frequency of use (that is, how a person wears them, what kind of work they are needed for), as well as many other individual parameters. Almost every company produces glass of different thicknesses. Thinner progressive lenses are the best in quality. thickenedlenses are correspondingly cheaper.
Flaws
Despite all the advantages, progressive lenses still have a number of disadvantages.
- Difficulties in selection due to the presence of several zones.
- High cost.
- Not a very wide visual streak. They do not cover the entire field of view of a person, in order to see something to your left you need to turn your head.
- Possible image distortion on both sides of the progression corridor.
- Have a slightly longer adaptation period.
- Specific frame parameters, tilt angle, pupil distance.
How to choose?
The selection of progressive lenses is carried out taking into account the characteristics of the profession, human habits, visual acuity, eye structure, etc. Manufacturing companies are rapidly improving optical glasses. So, today, for example, you can buy lenses made specifically for left-handers or drivers. The latter correct vision mainly at medium and long distances, thereby making driving as comfortable and safe as possible.
In addition, sun protection and photochromic glasses have been developed for drivers. They filter the visible spectrum, protecting the eyes from the sun, ultraviolet light, glare and glare. Optical glasses can be partially or completely darkened. With partial blackout, the lower part remains unchanged. The instrument panel will be clearly visible through it. Since driving a carconstantly changing lighting, these functions are extremely important.
Tips
For people who have used progressive lenses before, adapting to new glasses will be easy. But for those who have not yet had such an experience, it will take a couple of days to get used to it. It is better to start using them on the weekends. Be especially careful while driving.
Tips to help you get used to progressive lenses faster:
- You can't alternate using your old glasses with your new ones.
- In a relaxed atmosphere (for about an hour), alternately look from the object in hand to a more distant object. For example, you can sit in front of the TV and pick up a book. The main thing is that addiction should not take place at work or while driving a car.
- For half an hour, practice walking up the stairs. In this case, you should try not to lower your eyes too much, but only slightly tilt your head so as to look through the middle zone. This also applies to walking down the street.
- It should be remembered that there is a blind zone on the sides of each glass. In order to consider an object that is on the left or right, you need to turn your head. With regular glasses, a person could simply look away in the right direction, but with progressive lenses, this cannot be done.
- You can start driving only after you have fully adapted to everyday life.
Reviews
Progressive lenseshave conflicting opinions. Some people are very satisfied, they say that they are generally invisible in use. Others are not very happy with the purchase. Mainly due to the fact that there is a blind zone on the sides and while walking there may be a feeling of "being in a tunnel". There may also be an unpleasant feeling of "jumping picture", and it takes quite a long time to adapt when going down the stairs.
Motorists often leave positive feedback about progressive lenses for glasses. It should be noted that driving glasses have a slightly wider progression corridor. This is due to the importance of not distorting the image on the sides. Glasses for working at a computer have a narrower corridor, as they provide a good view of the monitor and keyboard. A bonus for drivers is that the glasses make them tinted and photochromic.
Probably the most important thing is the individuality of each person. It is difficult to say whether or not such glasses will suit any particular person until he personally tries to put them on. Some people find it very difficult to adjust to such lenses. Since there is a rather narrow space in the zone of maximum sharpness, the eyes must constantly look straight ahead, and only the head needs to be rotated. If a person squints his eyes in order to consider something to the left or right of himself, then the picture will "float away". And it is very difficult to get used to the fact that with a sharp turn of the head, the image is also instantly blurred. And even while watching a TV with a large diagonal, you need to move your head around the screen. Same with the keyboardmonitor and all. When copying material from the board in lessons or in pairs, you need to constantly change the focus, looking from the notebook to a long distance, so it is convenient for students and students to use them.
One can come to the conclusion that the choice of progressive optical glasses must be done with great responsibility. These glasses should only be purchased by people with presbyopia. They have proven themselves well as a device for performing a certain job, but not everyone is suitable for everyday life and constant use. If a person is firmly convinced that he needs such lenses, you need to contact the best specialists. Save on vision is not worth it. The selection process itself is quite complicated and long, but the end result will justify the time and money spent.
