How to choose the perfect lenses for the eyes?
Unfortunately, the number of people with poor eyes is inexorably increasing, this problem has significantly “looked younger”, now even small children know what it’s “bad to see”, not to mention the older generation.
There can be many reasons for this: poor ecology, harmful food, ubiquitous computerization and ignorance of safety rules, because the loss of vision can be prevented and stopped. Usually, people with poor eyesight can easily be recognized by their main “tool” - glasses, however, today it is not quite so: many “glasses” have long since switched to lenses.
The lenses are almost invisible, but they significantly improve the sharpness and depth of vision. The person who first tried on contact lenses, it seems that he suddenly found himself in another world, where everything is wider, brighter and more detailed, as if the veil falls off his eyes.
Now, in order to look down or sideways, it is not at all necessary to actively turn your head, but rather to squint your eyes.You can safely go in for sports, dance, ride extreme rides and even swim in the pool, without fearing that the glasses will fly to the other end of the hall.
With lenses it is easy to try 3D glasses in the cinema, afford sunglasses of any frame, and also not suffer from misted glasses during sudden changes of temperature.
Yes, in principle, it is possible to enumerate the contact correction of sight indefinitely, it really is much more comfortable than wearing glasses on the hangers, however, they have their own disadvantages. In particular, if you initially choose the wrong option, which can lead not only to the appearance of discomfort or irritation, but even to a deterioration in vision.
There are individuals with extremely sensitive corneas of the eyes, and therefore they will not be able to wear lenses at all. But, fortunately, this syndrome is rare, and therefore almost everyone can enjoy the advantages of such a device. However, this was not always the case.
Did you know that contact lenses literally half a century ago were imperfect and unsafe, and made them from wax? But, as a rule, everything goes forward, and therefore today you can choose safe and even colored contact lenses for the eyes. But how to do that?
So, before you go to the store to buy it is necessary, how to understand what they are and what advantages each of them possesses. As a rule, depending on the material of manufacture, they are divided into two large groups - hydrogel and silicone-hydrogel (refer to a new generation of materials).
The main problem that plagues almost all types of contact lenses is the poor possibility of air exchange. The cornea of our eye is arranged in such a way that it does not contain blood vessels, and therefore it is saturated with oxygen from the tear fluid and directly from the environment. If the cornea is “closed” with a “film”, then it will naturally interfere with its normal breathing.
Especially for this purpose, hydrogel lenses for vision have been invented, but they also provide the process of air exchange, although not always in sufficient quantity. Because contact lenses made of such material are used exclusively from daytime socks, sleep or doze in them is strictly forbidden.
The maximum possible coefficient of oxygen permeability is 78 units, and, in practice, no more than 20-40 units.For comparison: silicone-hydrogel modifications, which have a greater "breathing" ability, approximately 175 units!
And this means that such models can be worn, without removing a long time, left overnight and even for several weeks. But this material has its drawback - the relative rigidity of the material can cause severe discomfort to the eyes.
Also distinguish types of contact lenses, depending on the mode of wearing. For example, there are models for continuous wear (several weeks or even a month), which are not removed at night, there are daytime models, which are designed for 8-10 hours of continuous “work” and with a flexible schedule, you can wear them up to 18 hours.
There are also one-day variations that can only be used once. Daily replacement lenses are very popular among travelers or those who lead an active lifestyle, because they do not require any care, and you do not need to think about their storage and transportation.
In fact, this is an ideal option for those who have to wear lenses for only a few hours a day, for example, those who play sports or go to the pool.Perhaps the only drawback of this type is their price, because in terms of the day of wearing it comes out to be the highest among all the other options that exist today.
Quarterly lenses that require replacement after six months or a year of wearing are considered the most beneficial type, although it is necessary to purchase a special solution and peroxide tablets for them.
Of course, it is impossible not to mention such a subspecies as colored lenses, because they have long been actively used by many girls and even men who want to use them not only to increase the quality of vision, but also to change eye color. They are translucent and opaque, each of which is suitable for its own purposes.
For example, translucent ones are more suitable for bright eyes, they allow you to increase the depth of the look and add a piquant shade to it. Good opaque lenses are suitable for those who want to drastically change their native color, in the end, brown eyes "repainted" in green or blue, and so on.
Who is not suitable?
It turns out that there is no universal modification “for all”, and therefore they must be selected on the basis of the specific case and the anatomy of the eyes.Naturally, before choosing a model for yourself, it is necessary to individually consult with an ophthalmologist.
He will remove certain characteristics, as well as check the work of the lacrimal apparatus, after which he will be able to prescribe a certain kind of contact lenses. It is not recommended to select them yourself. Even if you know the power of the lenses of the glasses that you wear, it’s not a fact that the similar characteristics are suitable for choosing a contact correction.
In the event that they are selected correctly, with the help of lenses you can even improve the level of vision, which has been confirmed by many clinical studies. However, they have a number of their contraindications and exceptions. So why don't lenses fit?
- Presence of diseases of the organs of vision, such as keratitis, retinal thinning, conjunctivitis and others. By the way, the exception is people with mental illness.
- Professional limitations, for example, lenses are not suitable for those people who by virtue of the profession constantly face dust, work in strong wind or temperature changes, contact with toxic substances.
- Contact vision correction may not be suitable for scattered and inattentive individuals who are not capable of self-organization, because this is a process that requires constant attention: the lenses need to be replaced regularly, “bathed” in disinfectant solution, and also monitor the cleanliness of the containers. If they become dirty or certain hygiene rules are not followed, then lenses can cause irritation and infection of the eyes.
- A temporary contraindication may be colds, as well as the need to use eye drops, which are not always compatible with such devices to improve vision.
- Also, their use is worth thinking of lovers of decorative cosmetics, because the lenses coexist with it does not matter. If you do not want to completely abandon the make-up, then it is permissible to use only hypoallergenic products and they must be applied very carefully and in moderate quantities.
Date: 23.10.2018, 02:13 / Views: 35461
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