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If you forget to bring the contact lens care solution, you can boil the pure water and use it after cooling. It acts as a cleaning solution. Don't put the contact lens in it when the water temperature is high, which will burn the contact lens. Although the cooled pure water can't kill bacteria, it can prevent the contact lens from drying and keep the contact lens moist. Precautions for wearing contact lenses in the selection of contact lenses, we must choose regular contact lenses, and it is best to choose big brand ones. Big brand contact lenses do little harm to the eyes. The eyes are a very important organ, and it is worth using good contact lenses. If there are conditions, we should buy daily throwing contact lenses, This can avoid damaging the glasses when they are not well preserved. Contact lenses should not be worn for a long time. They should not be worn for more than four hours every day. They should be taken off for cleaning and rest. They must be taken off at night or when you sleep at ordinary times, otherwise redness, swelling and blood will appear. Wearing contact lenses for a long time will make the cornea lack of oxygen, At the moment of removing the contact lens, the eyeball enters the aerobic state in the anaerobic state, which will make the eyeball red and swollen. There are a lot of bacteria on your hands. Try to avoid direct contact between your hands and contact lenses. Be sure to wash your hands before removing contact lenses. Don't use self blisters for contact lenses, because there are many bacteria in tap water, such as Escherichia coli and amoeba, which are very harmful to your eyes. It is not suitable for people with contact lenses. People with eye diseases are not suitable for wearing contact lenses. They need to use their hands in the process of wearing contact lenses every day. The bacteria on their hands will enter the eyes. Those with corneal inflammation, trachoma and conjunctivitis should not wear contact lenses, which will cause eye diseases or make their condition worse. Primary school students are not suitable to wear contact lenses. The eyes of primary school students are still in the development stage, and the development of eyes has not been fully formed. Wearing contact lenses too early is not good for the eyes, and those who are too old are not suitable to wear contact lenses, especially those over 60. If they are too old, their eyes will degenerate, and wearing contact lenses will lead to eye lesions.