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Advantages of contact lenses
 The high technological standards achieved by the CLs manufacturing companies and the wide product range present on the market are able to satisfy the different visual needs of ametropes. There are, in fact, contact lenses able to adequately correct myopia, hyperopia, astigmatism and presbyopia which can be even associated, offering a wide choice of replacement (daily, fortnightly, monthly, three-monthly, six-monthly and yearly replacements).
The advantages of contact lenses
The CLs enable to have an optimum visual perception, in focus, as well as a perfect peripheral vision. The CLs are also quite handy and ” discreet ” given that they are highly unlikely to be noticed and can be worn at all times thus becoming precious friends in all situations and during our different ages, from childhood to old age.
In addition to that, contact lenses are safe and comfortable, suitable not only for the people who are willing to wear them all day long but also for those who are either willing to occasionally wear them ( at a party , or for a special event) or only during some particular activity ( such as practising a sport, going dancing or to the gym).
At the moment the CLs are divided into two big classes:
- the soft ones
- the rigid gas-permeable ones.
The soft CLs
They are called soft as their structure contains some water (a variable percentage swaying from 36% to 74%) which makes them soft and permeable to oxygen. This very characteristic is no doubt essential to the corneal physiology which, to keep on being transparent and efficient, has to continually receive oxygen from the outside.
The rigid / gas-permeable CLs
They are smaller and have a “stiffer” consistency and a “stiffer” structure than the soft ones and because of this it is easier to use them. The gas-permeable lenses, unlike the rigid ones, let themselves be passed through by oxygen, thus ensuring a better corneal oxygenation and comfort.
The importance of a correct CLs maintenance
Only a few simple rules enable us to get the best function and comfort from the application of contact lenses. The CLs tend in fact to get dirty because of the lacrimal film and of the atmospheric agents which they are constantly subjected to. Because of this reason they have to be carefully cleansed every time they are removed and replaced into their case. ( This rule is not obviously valid for the daily CLs which, being disposable, have to be thrown away after being used).
At the moment, a wide choice of specific solutions both for the eye characteristics and for the different kinds of lenses, assuring efficacy, safety and convenience, is available on the market. 
Physiological salt solution: This is a solution of distilled water and sodium chloride at 0,9 %. It is to be used before wearing the lenses in order to remove all residual traces of the solutions used for the lenses disinfection.
Preserving solution: This solution disinfects and keeps the lens hydrated, removing all microbial deposits.
Monophasic peroxides: These solutions disinfect and cleanse the CLs in a single phase. The contact lenses have to be kept immersed in the solution for at least 6 hours and then can be directly applied.
Whole solutions: These are liquids apt to cleanse and disinfect lenses if kept immersed in that same solution for at least 4 hours. They can be directly applied.
Enzymes: These are tablets which need to be dissolved in a physiological salt solution or in a disnfectant. They have the power to catalyze the chemical reactions which break the bonds existing among the molecules of deposits, especially if proteic ones, by fragmenting them into several parts which can be easily removed through friction.
Detergent solution: It removes the different kinds of proteic, lipidic or external deposits from the surface of the contact lenses. The detergent solutions have thus to contain some substances apt to make the deposits soluble if in water.
Artificial tears: These are isotonic solutions with a neutral pH, whose characteristics are similar to tears, working as a cushion between lens and cornea. To be used: when the lacrimal secretion is below average; when the peristasis presents an excessive dehydration of soft lenses; in situations lacking in comfort or presenting a dimming of rigid or gas-permeable lenses.
All the CLs maintenance products present on the market answer to the highest hygienic and safety needs; they are tested by the clinical laboratories of the CLs manufacturing companies and are brought onto the market only if they reach excellent performance levels.
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