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About contact lenses

Posted: admin on Jun 10 | skin care & beauty

The contact lenses are a few pieces of plastic that are placed curve on the eye to correct vision problems, for example in people with myopia or hyperopia. The contact lenses floating on the film of tears that occupies the front of the cornea (the transparent outer film that is at the front of the eye). The contact lenses work the same way as eyeglasses.

The contact lenses can correct most of the problems corrected glasses. They can also correct some problems that eyeglasses can not correct.

When used?

Many times people use contact lenses simply because you do not like how he left the glasses. In addition, unlike eyeglasses, contact lenses are generally not fall nor tarnished or wet in the rain.

Some people prefer to use contact lenses instead of glasses when they are very myopic or have had cataract surgery. The glasses will produce a vision uneven. The contact lenses can also serve to improve the vision of those whose corneas had been damaged by disease or injury.

The contact lenses may be a more practical solution for athletes or those who perform tasks that the glasses are a nuisance. Moreover, contact lenses provide better peripheral vision (the sides) that the glasses.

What are the main types of contact lenses?

The two main types of contact lenses in use at present are soft lenses and to gas permeable lenses (sometimes called hard lenses).
- The soft contact lenses are made of plastic hydrophilic (attracts water). They absorb liquid and are kept moist so that they remain soft and easy to mold the shape of the cornea. For many people is the most comfortable contact lens.
- The gas-permeable lenses are made of a durable and slightly flexible plastic that allows oxygen to the cornea. They are easier to care that soft contact lenses. The gas permeable lenses have replaced the original hard lenses that were manufactured from polymethylmethacrylate, or PMNA, for its acronym in English. These original hard lenses were long-lived and provide good vision, but did not allow the cornea receive much oxygen. Lack of oxygen can cause damage to the eyes.

Both the gas permeable lenses as the soft can be bifocals. Both types can also be used for coloring the sun, or simply for cosmetic reasons.

How can I get contact lenses?

First you have to be reviewed either by an ophthalmologist (eye) or by an optometrist who:

- Determine whether your eyes can be adapted to the use of contact lenses
- We recommend that type of lenses used either to gas permeable lenses or soft
- We will review the eyes of a year have begun to use contact lenses on a continuous basis.

When you begin to use contact lenses may feel a little discomfort when they are placed. This is normal. If you feel pain in their eyes, see your eye doctor. It recommends reviewing the eyes and lenses a week, 2 weeks, 1 month, 6 months and 1 year after starting to use them for the first time.

Precautions to follow

- When you begin to use contact lenses for the first time, follow the recommendations of your use of your eye care professional.
- Limp hands before getting drawn or contact lenses.
- Do not wear contact lenses for swimming. The soft lenses absorb chemicals from the water. The gas permeable lenses you leave the eyes.
- Most contact lenses can not be used for sleeping. If you sleep with the lenses placed it can damage the eyes because the cornea does not get the sufficient amount of oxygen. You can also run the risk of becoming infected. In the case of lenses widespread use, follow your doctor’s recommendation to know how much time you can use on a continuous basis.
- Put always contact lenses before makeup. Use water-soluble cosmetics. Do not use rimel tabs on them because the particles can stick in the eye. If you use a delineation of eyes for makeup and eyelashes between the eyes, contact lenses can be permanently discolor.
- Do not put contact lenses in the mouth to moisten or clean them. You can increase the risk of infection in their eyes.
- If you feel irritation, redness, pain, high sensitivity to light or blurred vision, see your eye doctor as soon as possible.

What problems may occur with contact lenses?

You may find it difficult to use contact lenses if you have:

- The eyes very irritated by allergies or by being exposed to dust or chemicals at work.
A too-active thyroid gland, uncontrolled diabetes or severe arthritis in his hands.
Eye-dried because they are pregnant or are using birth control pills, diuretics, antihistamines or decongestants.

The potential problems are as follows:

- Eye infections
- Allergic reactions to the cleaning solutions or particles that are deposited in the lenses
- Inflammation (redness) of the eye
- Scrapes cornea
- Change the form of the cornea
- Growth of blood vessels in the area of the cornea clear.

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