For any given substance, the heat capacity of a body is directly proportional to the amount of substance it contains (measured in terms of mass or moles or volume). Doubling the amount of substance in a body doubles its heat capacity, etc.
Conventional soft contacts can last up to a year; conventional rigid gas permeable (RGP) contact lenses can last even longer. Frequent or planned replacement contact lenses last one to several months. Disposable contacts last from one day (daily wear) to up to two weeks (extended wear).
A focusing contact lens will be placed on the eye. The treatment takes about 10 minutes and is not painful. Most patients say that they feel a slight âpopâ or âshockâ in the eye, but that it does not hurt. Your eye pressure may be checked either right after the laser treatment or one to two hours later.