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Questions 1-2 Unfortunately, the answer to these depend on the exact brand and line of contacts used. For example, here is a long list of silicon hydrogel lenses, and how long they last. Here is another list of materials used to make contact lenses (including many of the silicon hydrogel type). Some of those are dailies, but some can be worn day and night , ...


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Much like you probably won't catch a cold every time someone sneezes on you, you also most likely won't get an eye infection every time you neglect contact lens hygiene. We all did it at some point, I'm sure. However... just because you can't see the wildlife on your contacts and hands, doesn't mean it's not there. It is. Little buggers like this one https:/...


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A toric lens is the type that is used to treat astigmatism, not an aspheric lens. An aspheric lens is primarily designed to correct for the spherical aberration of the contact lens itself, the spherical aberration of the combination of the cornea and lens of the eye, or both. A toric lens is shaped like a slice of the side of a torus. It has a different ...


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Partly the additional sizing information required for contacts (Diameter and curvature of the cornea are needed for contact lenses but not for glasses) and the power also changes because the physical distance between the eye and the lens is different. References: Here is a page explaining the differences between the two prescription types with explanation ...


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Generally, wearing the same pair of contact lenses longer then 6-12 months can cause increased risk of infection, as your biggest concern. Sleeping with contact lenses in has a similar risk, as contact lenses combined with closed eyes for 8 hours causes loss of oxygen to the Cornea. You're not losing much taking them out at night, and you're risking a lot ...


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In optometry, "Continuous Wear" of contact lenses is a term used to refer to FDA approval of a contact lenses for wear continuously up to 30 days, then removing them for at least a full night of rest. "Extended Wear" lenses are approved for wear by the FDA for up to two weeks. And "Daily Wear" are not approved for wear while sleeping. Lenses that are ...


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