The redness of the eyes after wearing contact lenses for a long time may be caused by the lack of water and oxygen in the cornea caused by the contact lenses being worn for too long, which then causes compensatory congestion of the conjunctiva. In addition, if the contact lens is too tight, it may cause abrasions to the cornea, which may also cause compensatory congestion. If there is redness in the eye, if it is not accompanied by pain, anti-inflammatory drops such as levofloxacin, along with eye moisturizing drops such as sodium glacial, can be used for 2-3 days to recover. If the eye is red and painful, it is likely that the cornea has been damaged, so go to the hospital to determine the extent and depth of the damage. If the damage is only to the epithelium, most can heal within 1-2 days with the use of anti-inflammatory and corneal nourishing medications. If the damage is deeper, scarring may form and regular review is required to adjust the medication.