 The rate of release of a drug is also important because too slow of a release could have no beneficial outcome for the patient and a release that is too quick could result in negative side effects.Thus, it is important to balance the factors that govern the release of drugs from contact lenses as potential drug delivery devices.Researchers such as C. Alvarez-Lorenzo have tested (with animal models) and have data which supports that molecularly imprinted contact lenses release drugs in a sustained and long period of time.