FDA-approved extended wear contact lenses are safe for as many as seven days to a month of continuous wear. This extended wear capability is largely due to the fact that the soft-lens variety is made of silicone hydrogel, which allows more oxygen to reach the eye and also inhibits the formation of proteins and bacteria on the lens. Extended-wear contacts are also available as rigid gas permeable (GP) lenses, which are smaller and cover less area than their soft counterparts. Because GP extended-wear lenses move with each blink of the eye, they may also allow more oxygen to reach the cornea. While all extended-wear lenses are deemed safe, wearers should not be lax about adhering to the manufacturer’s wear instructions. Contact lenses can be an exciting alternative to glasses because they give the wearer a glass-free look and hassle-free wear all day long. If you decide to wear contact lenses rather than glasses, it is essential that you use good hygienic methods in the care and handling of those lenses.