Patients with chemical eye injuries and different type of eye infections typically suffer from pain, blurred vision and a red eye. Conjunctivitis is the most common eye infection. Corneal infection (keratitis) is less common but it has a serious risk to vision. Topical drug administration to the anterior segment of the eye is often limited by clearance mechanisms of the corneal surface and other factors, including eye blinking, tear film, tear turnover, solution drainage and tears discharge. Thus, most topically administered drugs are washed away within a few seconds after instillation.