What is an arcus? Ingrown eyelashes are eyelashes that grow toward the eye and touch the cornea and conjunctiva (normally, the eyelashes should be fully extended forward and not in contact with the cornea). It is often accompanied by an entropion of the lid. Clinical manifestations of impingement Eye pain, tearing, photophobia, foreign body sensation and other eye discomfort. If there is a large number of impingement and it rubs against the eye for a long time, it can cause damage to the corneal epithelium, corneal clouding, neovascularization, and even corneal ulcers, resulting in vision loss. How is entropion caused? Various causes of entropion can cause it, such as trachoma, blepharitis, blepharitis, congenital malformation of the eyelid, etc. How is it treated? If the ingrown eyelashes are just a few and are not associated with entropion, they can be removed with tweezers, or the eyelashes can be surgically removed by removing the hair follicles and destroying the follicles with electrolysis so that the eyelashes do not grow back. (Surgery may be considered if the child is 5 to 6 years old and the eyelashes are still turned inward, causing severe irritation to the cornea).