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There are many different types of soft lenses to meet your needs. Generally speaking, a soft lens is easier to adjust to than a rigid gas permeable lens. Soft lenses also tend to be more comfortable, especially when worn for prolonged periods of time.  Extended wear lenses — Can be worn overnight and left in continuously for up to seven days without removing them. In addition, Air Optix Night and Days are FDA approved for up to 30 days overnight wear.  Planned replacement lenses — Should not be worn overnight. Must be replaced regularly, usually every two weeks, four weeks, or 12 weeks. Silicone-based lenses — These lenses are highly breathable and prevent deposits from accumulating. This can result in a more comfortable lens with less risk of irritation, especially if you suffer from dry eyes.  Colored soft lenses — These soft lenses are colored with a tint. The tint may be functional (making it easier to find a lost lens) without altering the color of your eye, or it may be cosmetic, giving you a different eye color than your natural color. Though soft lenses are generally preferable for extended wear, they do not have the longevity that a rigid gas permeable lens has; however, there are some options as far as how long you can reuse a lens before it needs to be replaced.  Daily disposable lenses — These lenses will cost more money due to the frequency at which they are disposed of; however, changing your lenses on a daily basis carries the lowest risk of infection. These lenses are a good choice for people with dry eyes or are prone to allergies as deposits and allergens have less time to build up because you have a new lens each day. Two week/monthly disposable lenses — These are slightly less expensive than daily disposables, and still help reduce the risk of infection by using new lenses every few weeks. Some disposable soft lenses can even be replaced every three months, though you should always defer to your optometrist's advice. Many people choose contact lenses because contacts can be worn during sports without the risk of damage that eyeglasses carry. If you engage in outdoor sports, or if you generally spend a lot of time in the sun, you may want to consider talking to your optometrist about soft lenses with UV protection.  It's important to note that not all soft lenses provide UV protection, though many do. Talk to your optometrist about your options if UV protection is a factor in your decision. Full eye protection is important and UV protection in contacts only protects part of the eye. The rest of the eye should be protected too, so you should still wear sunglasses outdoors even if your contacts provide UV protection. For many people, soft lenses are more comfortable than rigid gas permeable lenses and better meet their needs; however, soft lenses usually don't correct vision as well as rigid lenses. There are some other disadvantages that are worth considering.  Soft lenses tend to absorb environmental pollutants more easily than rigid lenses. If you are around smoke or airborne particles on a regular basis, you may want to talk to your optometrist to determine if soft lenses would pose a problem. In addition to environmental pollutants, soft lenses also tend to soak up irritants from your hands, including lotion and hand soap. Washing your hands before handling lenses can reduce this risk, though it will not eliminate the chances of absorption. Because of their soft, porous nature, these contact lenses are much more fragile than rigid lenses. As a result, they may rip or tear more easily (though they are meant to be replaced more frequently).

Summary:
Learn the different soft lens options. Decide on a lens duration. Determine whether UV protection is important. Know the disadvantages of soft lenses.