Contact lenses

THEY ARE INVISIBLE AND CONVENIENT, THEY CAN BE USED TO CORRECT VISION IN THE RANGE OF -20 TO +20, OR JUST TO CHANGE EYE COLOR. LENSES LIMIT PERIPHERAL VISION, NOT FIGHTING. IN GENERAL, SOLID PROS. AND ARE THERE ANY DOWNSIDES?

Only for the nimble
Even the most modern and high-tech contact lenses are a foreign object to the eye. Not everyone is able to get used to them and wear lenses many learn with difficulty. Older people, children and adults with poor coordination and poor fine motor skills may never learn to do it correctly. And this can lead to eye damage the lens, and foreign objects that accidentally fall under it.

Need expert help
Do not forget that a contact lens is a medical device. In many countries for their purchase requires a prescription from your eye doctor. In Russia, a prescription is not needed, but it is not an excuse to skip a visit to the doctor. The parameters of the lenses are different from the downsides of your points, they should choose a professional as the optimum material, and the permeability of the lenses. The little piece of plastic mass parameters of size, shape, number of diopters, etc. Wrong lenses can cause regular fatigue the eyes and cause blurred vision.

Lenses require fanatical hygiene
Almost all complications wearing contact lenses a result of failure to observe hygiene when putting on and taking off, and improper cleaning, excessive wear and ignoring the unpleasant symptoms.

Protein deposits.
This problem occurs among those who use extended wear lenses. Components of tear fluid accumulated on the inner surface of the lens, reducing its transparency. If you do not pay attention to it, the further formation of deposits may lead to irritation of the cornea, and in severe cases to the development of infectious diseases of the eye. Because protein plaque is a great environment for bacteria.

Allergic reaction
They can cause the lens material and protein deposits, and substances included in the composition of the solutions for lenses. In addition, dust, dander, particles of cosmetic products can adhere to the outer surface of the lens and also to cause a reaction. It most often develops allergic conjunctivitis itching, irritation and redness of the eyes, lacrimation and foreign body sensation in the eye. Is a reason necessarily to go to the doctor. Corneal erosion
Mechanical erosion may develop if contact lens is damaged, dirty or under it were a foreign body (a speck of dust or eyelash). Another reason – accidental injury when removing or inserting lenses. Infectious erosion causing bacteria trapped in the eye with a contaminated lens and multiply under it.

Corneal edema
Occurs when the cornea is not getting enough oxygen. Most often it happens if the lenses are mismatched or made of a material poorly permeable to air, and if the person does not remove the lenses overnight, perekashivaet their time.

Keratitis
One of the most serious complications.
Inflammation of the cornea cause different microorganisms Staphylococcus aureus, Pseudomonas aeruginosa, amoeba, fungi Aspergillus and Candida.
They all fall into the eyes while removing and putting on lenses with dirty hands, if you use tap water for storage, bathing in open ponds and muddy pools.

The growth of corneal blood vessels
This occurs when the cornea for a long period of time loses oxygen. Usually it is the result of wearing lenses with low permeability. If time does not begin treatment, it may cause serious vision impairment.
In each of these cases, the main thing you need to do to remove the lenses immediately and seek an ophthalmologist. Not necessarily that you have to go back to the glasses: it is necessary to undergo treatment and to choose such lenses that will not cause problems in the future.