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There are many types of contact lenses:
There are many types of contact lenses available for treating vision problems. Talk to an eye doctor to determine the right type of contact lens for you.
Hard contact lenses
The majority of rigid (hard) lenses are made from gas-permeable materials, which allow oxygen to reach the cornea. This helps reduce problems that can occur when the cornea doesn’t get enough oxygen. They correct refractive errors such as astigmatism without distortion.
PMMA Conventional hard lenses (PMMA) are made from stiff plastic (polymethylmethacrylate). It does not mold to the eye’s shape. These contact lenses are durable and inexpensive, but they are not the most comfortable. They reduce the oxygen reaching the cornea and can lead to the overwearing syndrome.
Rigid gas-permeable lenses (RGP). While gas-permeable lenses are more expensive than traditional hard lenses, they are also less durable and more comfortable than hard lenses. While some gas-permeable lenses can be worn for longer periods of time (overnight), many eye specialists recommend against wearing them while you sleep or for prolonged periods. RGP lenses should be replaced every 2 to 3 years.
Soft contact lenses. Soft lenses (silicone hydrogels) are made from soft, flexible plastics that absorb water up to 90%. They are more comfortable than hard lenses and provide sharper vision. Soft lenses are less durable than hard lenses, and they require more frequent cleaning. Toric lenses are soft lenses that correct astigmatism.
Daily-wear lenses. Daily-wear lenses can be removed at night, cleaned, and reinserted in the morning. They do not correct astigmatism like hard lenses, but they provide sharp vision. They are easier to use than hard lenses but take longer to learn.
Extended-wear lenses. Extended-wear lenses are comfortable to wear day or night. You can take the lenses out after a few days and clean them. If contacts aren’t regularly cleaned and removed, some people experience irritation to their eyes. The risk of eye damage increases with prolonged use. Extended contact wear can be painful and uncomfortable. Some of these lenses are approved by the U.S. Food and Drug Administration (FDA), but many eye doctors recommend that they be removed every day.
Disposable lenses. Disposable soft lenses can be worn for several weeks before being thrown out. Disposable lenses are now preferred by many contact lens wearers. Because disposable lenses are easier to replace than soft lenses, it was believed that they would lower the risk of cornea infection (infectious or bacteria keratitis). However, studies later showed that disposable lenses, particularly the extended-wear type, can increase the risk of developing keratitis.
There are two types:
- Disposable lenses for daily wear are taken out and cleaned every day, just as conventional lenses. These lenses are then removed and cleaned every day for two to four weeks before being thrown away.
- Extended-wear disposable lenses can be worn every day for a week, then they are thrown out. Some lenses are approved by the FDA for use for 30 days. Some people are unable to tolerate prolonged wear. If contacts are not regularly cleaned and removed, their eyes can become reddened. The risk of infection is higher if the contacts are worn all day. Many eye doctors recommend that patients remove the lenses every day.
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