###Human: I sleep with contact lenses in my eyes. Will this affect my vision? ###Assistant: Hi. It can be an infection, but one thing you must remember is contact lenses should ideally be used 8 to 10 hours a day. If you wear during sleep and for more than 10 hours a day, there is a possibility of the eyes developing infection and transparency of cornea getting decreased over a long time.  You must stop wearing contact lenses till your eyes are clear. Start wearing spectacles. Contact lenses related bacterial conjunctivitis or corneal hypoxia. Detailed slit lamp examination. Start using antibiotic eye drops and artificial tears eye drops.