Contact lenses are uncomfortable to wear, mostly in the following cases: 1. Contact lens fitting is inappropriate, mainly because the size of the contact lens is not suitable. When the size and elasticity of contact lenses, and the eye does not match, it will increase the friction between the two, so that contact lenses repeatedly rub the cornea, resulting in corneal epithelial defects, keratitis, corneal ulcers, etc., causing eye redness, foreign body sensation and other discomfort. You need to use local antibiotic drops or eye ointment, suspend for a period of time and wait for the eye surface function to recover before fitting the right contact lens. 2, contact lens cleaning is not in place resulting in, if the contact lens is not thoroughly cleaned for a long time, it will make the protein residue on the contact lens surface, increasing the friction between the contact lens and the cornea. 3, contact lens removal is not standardized, resulting in contact lens surface scratches, increasing friction between the contact lens and the eye.