Multifocal lenses - what is it? Prescription of multifocal contact lenses, reviews about them

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2018-03-21 21:47:13

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There are several varieties of contact of optical materials. Day, toric, traditional. Most of the optical pairs is clear to everyone. Multifocal lenses: what is it? For what and to whom they are necessary? What features distinguish them from others? All these questions need answers, but first you need to understand the pathologies that these lenses compensate.

What is presbyopia

In the human body are age-related changes. Some of them (closing of the fontanelles, the change of milk teeth to permanent) are progressive. Other (decrease in the intensity of metabolic reactions) signs of regression. Such processes include the reduction of the elasticity and curvature of the lens, weakening of the eye muscles, leading to age-related farsightedness. Defective focus results in the inability to see fine detail up close (letters, numbers, graphic images).multifocal lens what is it

If such phenomena are associated with age and occur after 35-40 years, the farsightedness will be natural. It's called presbyopia and its correction are used multifocal contact lenses. At the moment this is the most modern way of correcting age-related farsightedness.

Multifocal contact lenses: advantages

The Contact methods of correction are actively gaining popularity among patients with presbyopia. There are several reasons.

multifocal contact lensesFirst, the lenses do not make life more constraints. Is the ability to move actively in all conditions. No matter where you were in the gym, at work or on the street with a child, everywhere should experience the freedom.

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Second, they do not change the appearance of the person. On the one hand, do not always want to tell the world about the deterioration of vision. With the other selected points may not be valid in a specific moment. The lenses neutral.

multifocal daily contact lensesThirdly, they are safe. Glasses break, injure the person during collisions. Modern contact materials are not only soft and elastic, which prevents damage to the eyes, but also have a protective action against UV, allergens, and irritants. Multifocal lenses daily disposable utilized along with got on them during the use of substances.

Fourth, they are always clearly visible. They won't fog, don't get dirty. But if their integrity is compromised (scratched or torn), then multifocal daily disposable contact lenses can just throw it away and get another pair.

Multifocal lenses - what it is

The Opportunity to correct presbyopic changes with glasses gives considerable inconvenience. The patient may need to carry and change 2 pairs of glasses. One is to focus on near objects. The second is designed to achieve a visual acuity when looking into the distance.

For the correction of presbyopia optic pair has a convex outside and inside. Two optical center make unique multifocal lenses. What is it? Such a structure of the optical system allows to choose at what distance to examine the object at the moment. One center is designed for viewing nearby objects, the second is to drill down far.

Types of contact lenses for presbyopia

selection multifocal contact lensPrescription of multifocal contact lenses provides ophthalmologist. The site can be to clarify the specific characteristics, but cannot be the primary diagnosis. If selection multifocal lenses manufactured correctly, that their use will bring a lot of fun. They are comfortable and completely to fix violations focus. Prescription of multifocal contact lenses with regard to their views. Not all contact devices for the correction of presbyopia are multi-center. The location of the points of refraction, they are divided into bifocal, multifocal and monocentric.

Bifocal

Their Second name - variables. Are the most simple form. Contain 2 optical zone. Their different power of refraction provides the possibility of obtaining clear images both near and far. The optical center in the middle sector can be found below. The center of the far vision at the top. To obtain constant clear images, the lens needs to be in a constant position on the surface of the eye. Such optical pairs are a full replacement points.

Circular

Also referred to as concentric. More recent modification of the bifocal model. In this embodiment, the centers of the near and far refraction are round, alternating. Belt replaced 4-5 times. In the middle of the lens more often is the center of the refraction of the rays from distant objects. This is the standard location for the hard lenses. In mild versions it is possible to use on the master eye of the same location, and the second is the opposite. Thus, on the retina simultaneously formed by 2 images, refracting the rays from near and distant objects. Central nervous system chooses the right moment projection.

Aspherical

The Refractive powers of these lenses changes from the centre to the peripherysmoothly. From the middle with the plot for small distances it is gradually moving to the edge, where around the radius of the located zones for distance vision. This is a more physiological model, because when working near the pupil is narrowed, and when looking at distant objects it expands and then becomes relevant to the ability of refraction of the peripheral areas of the lens.

Correction of presbyopia spherical lenses

This method is called monoideism. In fact, this ordinary lenses, they are not multicenter. When using one eye sample distance and another for close range, this method will be the most defective of the above. When is no true binocular vision. They are absolutely contraindicated to drivers, because they do not give a complete picture about the scope, depth and distance in space.multifocal lenses daily disposable

Period of use lenses

As the spherical lenses to treat presbyopia are divided on the term of use:

  1. Traditional. This kind of model can be used for 30 days or more. During this period they need disinfection and enzymatic treatment.
  2. Planned replacement. Such optical pairs are used 2-3 weeks before disposal. Safer and do not require additional processing. Stored in special containers. For each lens required a separate container.
  3. Multifocal lenses daily replacement. Such optical pairs are used within 24 hours. They do not need containers and disinfectant solutions. After a single use thrown.

The Contact lens surface and eye happening for a long time. To optical couple the increased demands. Numerous studies have established a direct relationship between the duration of use of the lens and the number of complications. The more days you use optical pair, the higher the risk of adverse events. So one day multifocal contact lenses are often recommended for the correction of presbyopia.

Patient Testimonials about the methods of correction of presbyopia

Patients with age-related vision changes use different ways of its correction. The surgical method they note the time spent on the operation, the invasiveness and tolerance of different rehabilitation period. Refractive methods, according to not only patients but also doctors, can reduce the level of visual acuity into the distance. They affect the stereovision, the contrast of the perceived images and the feeling of quality of vision. May disturb and increase the light sensitivity, dizziness, double vision.

multifocal lenses daily disposableWhen using points, along with the ease of application, patients notice a lack of aesthetic bifocal models. Also, a significant drawback is the limitation of peripheral vision, spatial perception. With them it is impossible to do sports. And when you use different pairs for near and far vision there are disadvantages of disguise, and the constant carrying of extra points.

Combined methods often combine the disadvantages of all applicable sposobov correction. So, when sharing contact lenses and glasses patients are unable to engage in mobile activities, have limited fields of view, spending time on the installation of the lenses and care for them.

Why patients choose multifocal lenses

multifocal lens reviewsMultifocal lenses reviews patients cause positive. Particularly important for most is the high visual acuity in the full range.

A Smooth transition of the middle and far modes makes the perception of the image softer. They allow you to live in the active motor mode and do not interfere with neither the drive nor the sport. Multifocal lenses: what is it? The ability to see well at any age.


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BE: https://tostpost.com/be/zdaro-e/3924-mul-tifokal-nye-l-nzy---shto-geta-takoe-padbor-mul-tifokal-nyh-kantakt.html

DE: https://tostpost.com/de/gesundheit/3922-multifokale-linsen---was-ist-das-auswahl-multifokale-kontaktlinsen-bew.html

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PT: https://tostpost.com/pt/sa-de/3923-mul-tifokal-nye-lentes---o-que-a-sele-o-de-mul-tifokal-nyh-de-lentes-d.html

TR: https://tostpost.com/tr/sa-l-k/3930-multifokal-lens-nedir-se-imi-mul-tifokal-nyh-kontakt-lensler-onlar-hak.html

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Alin Trodden - author of the article, editor
"Hi, I'm Alin Trodden. I write texts, read books, and look for impressions. And I'm not bad at telling you about it. I am always happy to participate in interesting projects."

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