о контактных линзах
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Contact lenses were more than a century ago. More precisely, in 1888, the first lens appeared that could be put on the eye and worn for several hours. It was invented and manufactured by the German physiologist Adolf Gaston Eugene Fick, calling it contact glasses.
Since then, the number of people who wear contact lenses has been on the rise. And this despite the fact that the first lenses were hard and not very comfortable: they were made of plexiglas. Ever since the invention of soft contact lenses in 1960, they have exploded in popularity. Although there is still an idea of the discomfort while using them, but now this is no longer the case. However, new users have a lot of questions, so let's figure out what lenses are the best.
Contact lenses are divided into types according to the following parameters:
If you choose each of the parameters correctly, it will be more convenient to wear lenses than glasses. Modern lenses have many advantages, among them: high-quality vision correction, wearing comfort (subject to proper selection), flexibility of use. They do not distort the appearance, allow you to lead an active lifestyle and engage in many sports, including those that will not work practice with glasses. Let's look at the types of lenses in more detail.
In fact, these are optical devices designed to correct impaired vision: myopia, hyperopia, astigmatism, presbyopia. Depending on the visual defect, they are designed to act on it, and all parameters work for this: both the shape and other properties.
Their main purpose is to change or emphasize the natural color of the eye. In accordance with this, they are colored or tinted. At the same time, cosmetic lenses can either have optical power or not, that is, have zero diopters. If vision correction is not needed, but you want to “change” the color of your eyes, then you need to look at the latter. But people with visual impairments may also not refuse a cosmetic effect with simultaneous vision correction with their help, choosing the necessary optical parameters.
These are modern lenses that are worn by a wide range of people with different visual problems. The many brands and types offered, the constant development of technology, the emergence of new, each time more and more advanced materials, have led to the fact that they are used more and more and cover almost all situations in which contact vision correction can be used. Ultimately, today they are most often referred to when they say “contact lenses” without clarification.
The main materials that are used for various types of soft lenses are hydrogel and silicone hydrogel.
Historically, they were the first, but have remained in use today, acquiring new properties, and with them new advantages. Now hard contact lenses are made from modern materials. The former were gas-tight, modern ones have a very high gas permeability and in this respect are significantly superior to conventional soft ones.
Traditional permanent wear contact lenses. The service life is from 6 months to 1 year. Produced in glass bottles.
Contact lenses for scheduled replacement. Available in blister packs – a special package that ensures the safety and sterility of the lenses.