Buildup on your contacts from lipids, proteins or calcium can also cause abrasions on the cornea. Any time you have an open injury on the eye, you run the risk of infection. Clean your contact lenses thoroughly to prevent buildup. Following the cleaning instructions given with the lenses should ensure they stay free from deposits. You should also replace them on a regular basis, as recommended by your eye doctor.
Do not sleep with your hard contact lenses in. This can cause keratitis. Leaving your lenses in too long is never a good idea. Keep your eyes well lubricated. If necessary, use eye drops designed for the purpose of lubrication.