Patients who wear contacts and feel that their vision is foggy may be caused by dirty lenses, eye allergies, eye infections and so on. 1. Dirty lenses: when the pupils are not cleaned for a long time, resulting in excessive accumulation of dirt above the lens, the patient can have a foggy feeling after wearing them. 2. Eye allergy: some special people, the eyes are very sensitive, in contact with the pupil with the dye, it is easy to lead to allergic reaction, leading to the patient’s tears, so there can be a foggy feeling. 3. Eye infection: bacterial keratitis, conjunctivitis and other eye infections patients, after wearing contacts, can trigger a local inflammatory reaction of the eye surface, resulting in conjunctival congestion and edema, the patient can appear foggy performance. Patients just put on the pupil foggy may also have other reasons, such as inaccurate degree, lens wear the opposite. It is recommended that patients who experience foggy eyes after wearing the lenses should consult a doctor in time to assess their condition and follow the doctor’s instructions for treatment.