If you don’t replace your lenses when you’re supposed to, usually monthly, deposits form on them. These deposits eventually cause the contacts to feel rough. Then inflammatory bumps begin to form under the eyelids that make it rough even with the contacts out of the eye. Follow the doctors prescribed disposable schedule. If you can’t afford to wear contacts properly, don’t wear contacts. If it’s just a matter of forgetting to change them, set your cell phone to alert you on the 30th of every month in the evening to throw your contacts out.