To overcome this problem, oxygen-permeable lenses were developed. Because these are actually a type of hard lens, the period of adjustment and routine wearing schedules are similar to the break-in period of regular hard lenses. Soft contact lenses are made of various types of water-absorbing plastics that allow oxygen to reach the eye. They are easier to adjust to than hard contact lenses, usually requiring no more than a week until they are comfortable. They are less likely than hard lenses to dislodge when playing sports, but they are less durable and may need to be replaced every year.
Soft lenses require careful attention to cleaning, rinsing and disinfection.
Extended-wear soft contact lenses can be left in the eye while sleeping, but, as mentioned previously, must be removed at least once a week for cleaning. Educating Yourself Don't be afraid to ask eye-care professionals whatever questions are necessary to understand their instructions. Make sure you know what brand of lenses you have and what eye-care products are specifically formulated for those lenses. If you develop any unusual or severe symptoms, see an eye-care specialist immediately, even if that means a trip to a hospital emergency room. Eye safety requires only a little education and a lot of common sense.