Extended And Overnight Wear

This article covers all kinds of extended wear contacts lenses and includes brands, safety, durability, and prices of these types of lenses. Extended wear lenses allow for more air to be allowed into the cornea thus they do not dry out as fast as regular contact lenses. Most extended wear lenses are approved to be used for up to seven days without changing, but a new contact material called silicone hydrogel is being approved for overnight use for up to thirty days. This material is considered super permeable. With these products you will immediately know how your vision will be, while wearing them they are approved to be as effective as normal contact lenses. The only concern with extended wear contact lenses are eye infections, but since the invention of silicone hydrogel, which allow up to six times as much oxygen to flow to the cornea.


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Another type of thirty day contact lenses make use of gas permeable lenses and can be worn overnight. Contacts cannot be worn longer than thirty days because of the amount of protein and lipid build-up caused by the moisture in the eyes. In the earlier days of extended use contact lenses, around 1981 was when they were invented, they were believed to increase eye infections among users, but this was mostly the result of not throwing them away and instead taking them out once a month and cleaning them, but then also putting them back in the morning instead of buying a new pair and throwing the old ones away.



By putting the old ones in with just a cleaning you are not properly removing all of the lipids and protein and it continues to build up resulting in eye infections. Brands associated with extended use contact lenses are Acuvue, Acuvue 2, Air optix, Durasoft, Hydrosoft, Hydrocurve, Purevision, Softcon EW, Vantage thin, and Z4. Prices for these lenses range from 13.45 for a box with 2 pairs inside of it, to 154.95 for a single pair of lenses. These products prices are based on how long at a time you can wear them as well as how durable the lenses are. The more expensive lenses are based on a thirty day wear cycle, while the less expensive ones are based on a seven day wear cycle. Contact lenses continue to evolve and one day we may very well invent ones that can be worn permanantly without removal.


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