Contact lenses

Medical content revised by - Last revision 17/06/2019
Contact lenses

The use of contact lenses is becoming more common. Is for this reason that is very important to know the different types of lenses and injuries that they can cause if they are not used in a proper way.

There are different types of lenses and is necessary to choose the most suitable for our eyes, which will be adapted with a proper use and hygiene and a proper preservation of each type of lens.

What are the different types of lenses?

Soft contact lenses: they are used to compensate moderate refractive errors, such as myopia, hyperopia and astigmatism.

Rigid contact lenses: they are smaller, harder and less flexible than soft ones. They are used in patients with high astigmatism or in cases with corneal irregularities.

Scleral or semi-scleral contact lenses: they are advisable for patients with severe dry eye as they are larger and stiffer and can be filled with artificial tear, which allows the eye to be permanently moist

Orto-k: they are used at night for patients that have myopia.

How to use contact lenses?

Put on you contact lenses 20 minutes after getting up and take them off 20 minutes before going to sleep.

Remove contact lenses in case of a sensation of itching, dryness, discomfort or blurred vision.

Do not wear damaged or broken contact lenses.

Clean the lenses and change the solution every day.

Use the artificial tears to constantly humidify the cornea.

What injuries can contact lenses cause?

Contact lenses can lead to irritations, allergies, injury by rubbing and infections. This will depend on the type of lens, the hygiene and the cure that we have of the products that are used to clean and the manipulation of the lenses made when we used them.

It is rare that allergies are produced by the material of the lens (it is rare). The most common is due to the accumulation of the deposits that are formed and the preservatives dissolved in the cleaning products.

Corneal abrasions (scratches or rubbing) give rise to intense pain with tearing, ocular redness, discomfort to light, foreign body sensation and intolerance to the lens (shape, measurement, etc.) or alterations of the lens by notches or breaks.

The symptoms of blurred vision, halos of colours and intolerance to the lens (reddish, foreign body sensation, tearing, etc.) can appear if the lenses are worn too long.

Infections are usually rare, but they can be very dangerous and cause loss of vision in the eye.

How to avoid injuries or infections with contact lenses?

  1. Do not wear lenses more hours than recommended
  2. Review them periodically to assess the existence of alterations, deposits or breakages.
  3. Clean them daily in an adequate and rigorous way, trying to eliminate completely the residues of detergents and neutralizers
  4. Do not use them in work activities that produce dust or particles in suspension and sports activities such diving.
  5. Always place them before applying makeup. It is not recommended to paint the inside edge of the eyelid.
  6. In front of any eye discomfort, remove the contact lens. If the discomfort does not subside, it is necessary to go to the ophthalmologist.

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