Contact lens: the salvation of the modern man

Health And Medical Video: How It'S Made: Contact Lenses (December 2018).

Anonim

Millions of people prefer contact lenses with glasses. These small plastic or silicone disks reliably and effectively help to cope with various visual impairments.

Contact lenses wear directly on the eye, where they "float" on a thin film of tear fluid that forms on the surface of the cornea. The appropriate ophthalmologist will help you find the appropriate lenses. Not only does it measure visual acuity, it also guides you in the boundless ocean of modern ophthalmic devices.

General Information

Contact lenses are dressed directly on the eye, where they "float" on a thin film of tear fluid that forms on the surface of the cornea.

The ophthalmologist will help you to find the appropriate lenses. Not only does it measure visual acuity, it also guides you in the boundless ocean of modern ophthalmic devices.

Rigid (dense) contact lenses

  • Traditional hard lenses made of polymethyl methacrylate Made of transparent plastic. They help correct vision without any distortion, but are least comfortable to wear.
  • Rigid Gas-permeable lenses More comfortable. Some of them can be worn for a week and do not shoot at night.

Soft contact lenses

  • Lenses for Day wear You need to remove and clean before bedtime. They are stored in a special solution for contact lenses, and in the morning are dressed again. Such lenses need to be updated at least once a year.
  • Lenses for Prolonged (extended) wear Can be worn continuously for a week, not removing them at night. However, this mode of use can be uncomfortable, and also increases the risk of irritation and eye damage.
  • Variable contact lenses It is allowed not to be removed within a few weeks, after which it is necessary to replace them with a new pair.

Why

Needed

Contact

Lenses

?

Most people choose the lenses for convenience. In addition, unlike glasses, they allow a person to look naturally. The lens is used to correct so-called refractive errors. These visual disturbances include short-sightedness (myopia), farsightedness (hypermetropia), presbyopia, and astigmatism. Lenses for correcting astigmatism are called

Torical

. Usually they are made to order, taking into account visual impairment in each particular case.

In addition, contact lenses can be used by people who have been operated on for cataracts when the "native" cloudy lens is removed. Also, lenses are used in the treatment of certain eye diseases, such as keratoconus (thinning and changing the shape of the cornea to the conical), and traumatic or infectious corneal injuries.

Especially for people with myopia and presbyopia (age-related vision impairment) developed

Bifocal

Contact lenses At the same time, each lens allows a person to see far-removed objects and simultaneously read or work with close objects. If the bifocal lenses do not suit you, the ophthalmologist can recommend

Monozrenie

. In this case, one eye opt for a lens for correction of myopia, and for another - to correct hyperopia. Many people who discovered monozrenie for themselves, were able to adapt to him. And, nevertheless, such a method of correction is not without flaws. Since each eye works separately, it disturbs the binocular vision, which, in turn, leads to inferior perception of depth. In other cases, when correction of presbyopia, the doctor can advise a combination of reading points with contact lenses for a distant view.

Who can successfully wear contact lenses?

  • People who have short-sightedness have reached such high values ​​that correction of vision is necessary constantly. Those who wear glasses only occasionally use contact lenses much less often.
  • People with strong motivation. Wearing lenses involves some discomfort when you dress and take them off. In addition, it takes time to get used to the new adaptation, as well as learn the rules of preservation and care of the lenses.
  • People who are engaged in sports or perform such work, in which wearing glasses is difficult or even dangerous.

Contact lenses may not fit a person if:

  • He can not or does not want to take care of them properly
  • It is difficult for him to wear lenses, for example, in severe arthritis with lesion of the joints of the brush or other diseases that complicate the manipulation of the lenses.
  • There are various diseases, for example, uncontrolled diabetes mellitus or hyperfunction of the thyroid gland. It is difficult to wear lenses when it is allergic, bronchial asthma and other chronic lung diseases.
  • In the presence of dry eye syndrome or corneal problems (eg, chronic infections or ulcers). Harshly wear contact lenses and people with Sjogren's syndrome (a condition in which the function of the glands of the external secretion, including lacrimal and salivary, is impaired).
  • The work involves the effects of vapors or particles of chemical compounds that can penetrate or settle on the lenses (eg dust, paint, spray or hair spray).

Are lenses suitable for children?

Newborns and young children, contact lenses are usually prescribed in exceptional cases for the treatment of certain diseases, such as aphakia (congenital absence of the lens), amblyopia ("lazy eye"), and severe refractive errors. Many teens prefer lens eyeglasses, especially if they are teased at school. However, it is important to remember that in the adolescence, lenses have to be changed especially often, which is associated with age-related changes in the eyes up to 20 years.

Is it dangerous to use contact lenses?

Lenses have small undesirable effects, which, however, can greatly annoy some people. But in general the risk of developing an infection or other complications is extremely low.

Wearing contact lenses can lead to the following disorders:

  • Dry eye syndrome
  • Corneal abnormalities, such as swelling and blurred vision. The reasons for this are lack of oxygen supply to the cornea (hypoxia), scratches, changes in shape and corneal infections
  • Allergic reaction to the components of the solution for contact lenses
  • Inflammation of the eyeball tissue
  • Inflammation of the century, which leads to its edema and makes it difficult to wear lenses
  • Education on sediment lenses, which increases the risk of infection

Some problems arise when using a certain type of lens. The solution lies in the more frequent cleaning and changing of the solution, and in some cases - and in the change of type of the lenses itself. In addition, the cause of the problem is often the failure to comply with the instructions for use (time of wearing, disinfecting, storing). Do not forget that the health of your eyes is only in your hands!

Contact lens: the salvation of the modern man
Category Of Medical Issues: Diseases