Foreign body sensation after wearing contact lenses for a long time is usually due to the lack of water and oxygen in the eyes as a result of wearing contact lenses. Contact lenses need to contact the cornea, and some contact lenses have poor water permeability and hydrophilicity, and oxygen permeability may not be ideal, resulting in a lack of water and oxygen in the part of the cornea that is covered, causing the foreign body sensation in the eye to worsen. Usually, in such cases, one needs to stop wearing contact lenses, and the other can use sodium vitreous acid-based artificial tear drops. If the eye is significantly congested and there is a strong stinging sensation, you should also go to the hospital to check if there is any damage to the cornea. If there is damage to the cornea, you need to use antibacterial drugs and drugs that nourish the cornea, which usually take 2-3 days to heal completely.