with rigid contact lenses were only around until the 60s, when the effects were not available for all lenses oxygen, up to the cornea. Finally, oxygen-permeable rigid materials, or so-called RGP contact lenses were introduced.
The original idea that inspired the development of soft contact lenses was in the late 1950s by the Czech chemist Otto Wichterle and Lim Drahoslav In some countries, the new hydrogel lenses in the 1960s, but only in 1971, when Bausch & Lomb's SofLens was assumed that the soft lenses, the mass appeal. The soft lenses were immensely popular thanks to their immediate comfort and convenience.
In the following two and a half decades, the oxygen permeability of soft contact lenses has been improved, and the first silicone hydrogels have been shortly before the postponement of the millennium. This combines the high quality of comfort of the hydrogels with the extreme oxygen permeability of silicone and then increased the popularity of contact lens wear.
Soft contact lenses are bigger than RGP lenses, the entire edge with the iris to the sclera, and thanks to their flexibility, they are very easy to get used because they take the form of an eye of course. During the adjustment period when switching from glass to contacts can be some discomfort, the 30-80% water content of soft contact lenses is much shorter this time. These lenses, sometimes referred to as a piece of thick cling film, usually only a few days to adjust to, compared to weeks with RGP lenses.
in parentheses to the eyes, soft lenses prevent foreign matter from where you can distinguish between the lens and the cornea and cause irritation. The handle is also the lens in a position that does not fall out.
The only slight drawback to soft contacts, compared to RGP lenses, the price – they must be replaced more often, or, if not removed every day, thoroughly cleaned and disinfected. Cleaning and accessories are of course a small additional cost, as well as a greater quantity of supply. Many carriers, however, are more than happy to pay the extra few pounds for the exceptional comfort of soft contact lenses.
Soft lenses are by far the most popular types of lenses in order to more than 95% in Scandinavia and in the vicinity of 80% of the prescribed lenses in Japan, the Netherlands and Germany.
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