There are two main types of ingrown eyelashes, those without eyelid entropion and those with eyelid entropion. How does it happen? There are many eyelashes on the upper and lower lid margins of the eye. The eyelashes grow at a certain angle, with the upper face eyelashes extending upward and the lower face eyelashes extending downward. When the eyelashes change direction and grow toward the eye, piercing the cornea and conjunctiva, it is called an inverted eyelash. When the lashes become lodged in the cornea and conjunctiva, the eye feels tingling, tearing and a foreign body sensation. In severe cases, the eyelashes act like a “brush” and rub against the transparent and delicate cornea with the transient movements of the eye, slowly clouding the superficial layer of the cornea over time and affecting vision. After the cornea has been bruised by the backward eyelashes, the surface is unprotected and germs can take advantage of the opportunity to cause corneal ulcers, which can cause serious damage to vision. Even if the ulcer is healed, it will leave an opaque opacity, causing permanent impairment of vision. Tu Yongfang, Department of Oculoplastic Surgery, Anyang Eye Hospital What eye diseases can cause impingement? The most common is trachoma. Other diseases such as conjunctival burns, conjunctival aspergilloma, and diphtheria conjunctivitis can cause scarring of the face plate to produce scarring inversion of the inverted eyelashes. Many people use tweezers to pluck it out by themselves, which temporarily relieves the problem, but soon the new lashes appear again. If you have a lot of ingrown eyelashes and also have an entropion, you should have corrective surgery. For spasmodic ingrown eyelashes caused by inflammation of the eye, the inflammation should be treated and the ingrown eyelashes will be relieved as the inflammation disappears. Spastic entropion caused by skin laxity in the elderly can be treated with surgical correction. In infants and young children with mild congenital lower eyelid entropion, it is not easy to damage the cornea because the eyelashes are fine and soft, so if the conjunctiva is not congested and the cornea is normal, there is no need to rush surgery. If you find that your child has congestion and tearing in the conjunctiva, you should check it in time, and if you find that the cornea is damaged by inverted eyelashes, you should operate in time. In children with congenital double row eyelashes, if there are only a few rows of lashes, the hair follicles can be electrolyzed, while rows of more double row eyelashes require surgery to remove the extra row of lashes.