Application of contact lenses
Application of contact lenses
For a long time, the only way to improveeyesight had glasses, but in recent years people with visual impairment have increasingly used contact lenses, assessing their undeniable advantages. Color lenses are also worn to change the color of the eyes, if not satisfied with their own. Contact is called a small transparent lens, worn directly on the pupil of the eye for increased visual acuity.
According to WHO specialists, contact lenses inthe world is worn by about 125 million people, which is not surprising, because lenses are much more convenient than glasses, and with some diseases are also much more effective.
Appoints contact lenses doctor ophthalmologist for diseases such as astigmatism, high myopia, keratoconus, anisometropia and many others.
Classification of contact lenses
Contact lenses are distinguished in many ways: material of manufacture, frequency of replacement, a mode of carrying, a degree of a transparency and many other things. Basically, all contact lenses are divided into two groups: soft contact lenses and hard contact lenses. Almost 90% of people who use such devices wear soft lenses. They are elastic, permeable to oxygen and metabolic products, hydrophilic, and therefore perfectly tolerated by patients. The soft lenses themselves are divided into hydrogel and silicone-hydrogel ones for the material of manufacture. Despite the convenience of soft lenses, they can be used only in cases when there are no significant changes in the shape of the cornea, because in this case they repeat the irregular shape of the eyes. For these cases, rigid contact lenses with their stable form are used. The material for manufacturing such devices is oxygen-transmitting polymers.Eye Hygiene and Contraindications
If the lenses are selected correctly in the medicalcabinet, and the patient complies with all recommendations on the timing of wearing, handling and care, then the lenses do not harm the eyes. But if you do not follow all the prescriptions and recommendations, you may have eye irritation, redness, and even infection. If you regularly refocus your lenses, do not replace them in time for new ones and use a material with low oxygen permeability, then gradual germination of the vessels into the cornea and other abnormalities is possible.Some disorders not only can become serious contraindications to the further wearing of contact lenses, but also cause irreversible changes in the cornea.All people wearing contact lenses, it is necessary to regularly undergo a preventive examination from an ophthalmologist.
Precautionary measures
If you feel any discomfort in your eyesWhen wearing lenses, consult a doctor immediately. He can find out the cause of the ailment and eliminate it. Color and toning lenses should not be worn at night, as the pupil at this time expands, and the shades of the artificial iris can serve as an obstacle.Color lenses are also forbidden to wear in the case of driving a car and other works requiring increased visual attention.Conventional lenses also have a restriction in wearing: they can not go to the sauna and bath, swimming in the water is allowed only if there are tight glasses for water procedures.
