Tuesday, June 17, 2008

What Is A Contact Lens?

There are several types of contact lenses, adapted to the needs of each person. But we can give characteristics common to all: the lens is round plastic water and permeable to oxygen, a few millimetres, which is positioned on the surface of the eye. The contact lenses are virtually invisible once placed on the eye.

First, there are so-called rigid lenses. This means that lenses are fairly hard to touch. The rigid lenses to correct astigmatism corneal perfection, and can hinder the development of myopia in children. They are advised people living in a dry atmosphere, or with a slight dry eye. However, they are rigid so they are uncomfortable at first and it takes some time to adapt fully. The rigid lenses must be renewed every 12 months to 24 months, and maintained regularly with products.

The new generation is that of soft contact lenses. Totally adapting to the curvature of the eye, no discomfort to the wearer, except in cases of dry eye. They correct almost all sight problems. However, like the rigid lenses, they must interact regularly for the majority and they have a lifespan of between one day and one year. This range is wide: there are daily lenses that do not need any maintenance (you put two in the morning, you throw them in the evening), weekly lenses, monthly lenses ... Personally, I wear soft contact lenses. But again, everything depends on what you advise your ophthalmologist.

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