###Human: Are there any drawbacks in using contact lenses? ###Assistant: Hi. Spectacles are the first option for refractive errors and contact lenses are only secondary. There are many types of contact lenses in various brands. Commonly used are soft contact lenses. There are daily disposable ones, monthly disposable ones and those which can be used for more than a month. These are available in different price ranges. Drawbacks: I suggest you use monthly disposable contact lenses just for six to eight hours per day and only about five times a week. Hope this helps. Consult an eye care ophthalmologist online for further clarifications -->