Blurry eyes with contacts may be caused by improper wearing or diseases such as keratitis. 1. Improper wearing: If you wear contacts for a long time, or if your contacts are worn out and become blurred, you are prone to blurring of the eyes, foreign body sensation and other phenomena. 2. Keratitis: This disease may be caused by exogenous pathogenic microbial infections, such as bacteria, fungi, viruses, etc. It may also be caused by the lack of vitamin A or suffering from autoimmune diseases, and it may also be caused by the spread of conjunctivitis, scleritis and other diseases. Pupils may cause inflammation of the cornea and symptoms such as blurred vision, eye pain, photophobia, tearing, and eyelid spasms. There are more causes of blurry eyes when wearing contacts, so you need to visit the hospital and have a relevant examination to clarify the cause.