Contact lenses should be changed once a day if they are worn frequently, and at least once every 3 to 4 days if they are worn infrequently. If eye discomfort occurs when wearing contact lenses, it is recommended to consult a doctor in time to avoid delay. Contact lens care solution contains sodium chloride, humectants, preservatives and other ingredients, it is recommended that contact lenses are not worn without replacing the care solution at least once every 3~4 days, and each soaking time should be more than 6 hours, which is conducive to the removal of dust, impurities, bacteria on the contact lenses, as well as to play the role of moisturizing. If the solution is not changed for a long time, some of the main ingredients in the solution will lose their activity, which is not conducive to contact lens cleaning and may lead to lens dehydration and bacterial growth. It is also important to note that it is usually best to use up the opened contact lens care solution within 3 months. Contact lenses should be worn and cared for correctly in order to minimize damage to the eyes, and contact lenses should not be worn for too long a period of time each day, and contact lenses should be removed and soaked in the care solution before going to bed.