Contact lenses are contact lenses that are worn directly on the cornea, because most contacts are poorly permeable to oxygen, and poor quality contacts may also shed pigment and irritate the conjunctival cornea, leading to conjunctivitis or keratitis. It is recommended that you soak them in a special care solution. It is not recommended that you choose to soak them in water, as the water may contain a variety of microorganisms and even contain Echinococcus amoebae. If the corneal epithelium is accidentally damaged during the process of wearing contacts, it can easily lead to various microbial infestations and conjunctivitis or keratitis, or even keratitis caused by infection with Echinococcus amebae. This may lead to redness, swelling, pain, photophobia, tearing, and even significant vision loss. So if you wear contacts often, try to choose to reduce the time you wear them, plus be sure to soak them in a professional care solution.