by 
The Curious Bag
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<h4 class="dechead">On One Hand: Extended Wear Lenses
Gas-permeable contact lenses, which are more rigid than soft contact lenses, allow oxygen to reach the eye. Daily wear contacts are not meant to be slept in, but some types of gas-permeable lenses are made for extended wear of up to 30 days.
On the Other: Possible Complications
Today's extended wear contact lenses are safer than those of the past. Some complications may still occur, such as irritation, infection or reduced vision. Exposure to smoke or swimming may increase the risks of complications, while proper cleaning and usage will decrease them.
Bottom Line
Most people can sleep in gas-permeable contacts that are made for extended wear. If your eyes are red, irritated or infected, or you experience reduced vision that does not improve with new lenses, extended-wear lenses may not be suitable for you.
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