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).
The preservative in this product may be absorbed by contact lenses. If you wear contact lenses, remove them before using this medication and keep them out of your eyes for at least 10 minutes after each dose. Tilt your head back, look upward and pull down the lower eyelid to make a pouch.