Contact Lenses are made of many different types of plastic, but in general, they fall into two main groups : soft contact lenses and gas permeable contact lenses.
Soft Contact Lenses
These thin, gel-like lenses conform to the shape of your eye. They are more flexible than gas permeable contact lenses, so many people believe they are more comfortable and easier to get used to.
Disposable : These lenses are designed for short term use during waking hours. Depending on their composition, disposable lenses may need replacement every day - you throw them away after wearing them once - or at longer intervals, up to three months. Most of these brands are good to wear for two weeks.
Daily Wear : These lenses are typically inserted every morning and removed every night. They should not be worn during sleep. Properly cleaned and stored, one pair of daily wear lenses should last up to one year.
Extended Wear :These lenses are designed to provide adequate oxygen to your cornea even while you sleep therefore you can wear these lenses continuously - for up to seven days with standard extended wear contacts, and all the way to 30 days with lenses made of super-permeable silicone hydrogel.
Gas Permeable Contact Lenses
Gas permeable contact lenses are generally made of a harder plastic material that does not contain water. Although they are not as flexible as soft contacts, gas permeable lenses allow more oxygen to pass through to the cornea than do soft lenses, reducing the risk of corneal irritations.
Gas permeable lenses can correct a wide range of vision problems, including astigmatism, which is a type of blurred vision caused by irregulary shaped cornea. After a short period of adaptation, most people can wear gas permeable lenses comfortably. Gas permeable lenses are easy to care for, and they are less likely to cause infection and more durable than soft lenses.
Gas permeable lenses need to be replaced less frequently than do soft contact lenses and may be work, on average, for two to three years.
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