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Contact lenses can be divided into several groups according to the following parameters: Hard contact lenses Hard contact lenses are used mainly for the correction of complex cases (they are not interchangeable with high degrees of astigmatism and keratoconus) and orthokeratology. Rigid lenses can achieve an increase in visual acuity due to the fact that they retain their shape. They are really tough, so in need of particularly careful handling. At the same time, the hard lenses have several advantages: the amount of protein deposits are much smaller as they seldom cause allergic reactions. These lenses require individual selection and fabrication. Gas-tight rigid contact lenses Rigid gas permeable contact lenses Soft contact lenses Soft contact lenses are worn about 90% of contact lens wearers in the world. They are used to correct myopia, hyperopia, astigmatism and presbyopia, as well as to enhance or change eye color. Range from +20 D to-20D. Soft contact lens covers the iris and takes the shape of the eye. It is retained on the eye with tear tension (capillary effect). These lenses do not have a high probability of accidentally dislodged or fall out of the eye. Recommended by the manufacturer of contact lenses maximum period of use, after which the lenses must be replaced. Traditional contact lenses Life of soft contact lenses from 6 months to a year. Lifetime rigid contact lens over a year (several years). Planned replacement contact lens manufacturer According to the regulations need to be replaced after - Monthly - Three-month - Six-month Contact lenses are a frequent routine replacement They have a life span of one day to two weeks. - Daily - Weekly - Bi-Weekly Recommended by the manufacturer of contact lenses maximum period of time during which the lenses can be worn without removing. Daily contact lenses Lenses dress in the morning and removed at night before going to bed. Contact lenses are flexible-wear lenses can be worn Contact lenses are extended-wear lenses fit over 7 days and can not be removed overnight. Contact lenses are continuous-wear lenses can be worn continuously for up to thirty days without removing them at night. This mode is only available for some silicone hydrogel lenses. To use it is necessary to consult a doctor ophthalmologist. Note: The service life / contact lens use is strongly dependent on the mode of wear. In the case of extended wear life of contact lenses according to manufacturer's regulations should be reduced to Spherical contact lenses are used to correct myopia (nearsightedness) and hyperopia (farsightedness). Toric contact lenses are used to correct myopia (nearsightedness) and hyperopia (farsightedness) in the presence of astigmatism. Multifocal contact lenses are used to correct presbyopia (presbyopia). Note: By design, contains a breakdown in terms of the method of the contact lens. Certainly lens design is the secret of every company, even though it is for marketing purposes, in one form or another, is declared. Optical contact lenses are used to correct vision defects (refraction anomaly). Cosmetic contact lenses are used to correct various congenital or acquired as a result of trauma, eye defects, such as iris coloboma, corneal opacity, etc. Therapeutic contact lenses is mainly soft contact lenses, which by virtue of their hydrophilicity may be used as protection of corneal bandage as well as a reservoir for sustained delivery of drugs to the eye tissues. Decorative contact lenses Tint decorative contact lenses Colored decorative contact lenses Decorative contact lenses Crazy They applied a variety of patterns and effects. Decorative contact lenses Crazy clothes, mainly by going to a disco or a party, used in the movie industry to create eye vampires, aliens and other characters with unusual eyes. Contact lenses for sports Recently, the major manufacturers of contact lenses are developing special lenses for individual sports. For example, there were lenses that selectively increase the contrast detection yellow ball for the game of tennis and softball. Transparent contact lenses Painted contact lenses Some soft contact lenses have a weak coloring in order that they are easier to detect in the solution in which they are stored. However, they do not change the tone eyes. Contact lenses are UV-absorbing lens absorbs ultraviolet rays to protect your eyes from harmful UV rays. For more information on the impact of ultraviolet radiation on the eye can be found here . Contact lenses do not absorb ultraviolet rays
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