White threads in the eyes, in most cases, are conjunctival secretions, which are mainly found in people who use their eyes excessively for a long time, such as those who watch cell phones, computers, and books. However, if it is accompanied by redness, pain, itching, dryness, etc., or if there are too many white threads in the eyes, it may also be caused by allergic conjunctivitis. In addition, if the white threads do not subside within a few days, it cannot be ruled out that it is caused by diseases such as filiform keratitis.1. Allergic conjunctivitis: For example, when pollen, animal hair and other allergens stimulate the patient’s eyes, it triggers an increase in conjunctival secretions, often accompanied by itchy eyes, photophobia, tearing and foreign body sensation. The white thread-like material is mainly conjunctival secretions, and it will be discharged with blinking and rubbing of the eyes, with a sticky texture. If the symptoms are mild, you can use non-steroidal eye drops to reduce the formation of white thread-like secretions, such as diclofenac sodium drops; if the symptoms are severe, you can also add topical corticosteroid drops, such as dexamethasone sodium phosphate drops, and oral loratadine and other antihistamines for treatment under medical supervision; 2, filiform keratitis: with allergic conjunctivitis Unlike allergic conjunctivitis, the white thread-like material in the eyes of patients with filiform keratitis can last for several days without fading, and there is much curling, and the lines can be thick or thin. Therefore, patients with this disease tend to feel a foreign body in their eyes, and in severe cases, they may experience eye pain, red eyes, difficulty in opening the eyes, and tearing. Patients with this disease usually have a past or present history of dry eye disease, scarring keratitis, or have worn corneal contact lenses or had internal eye surgery. The white threads can be removed through local eye anesthesia by a medical professional. But if you want to cure, you need to start with the primary cause, such as the use of antibiotic or antiviral eye ointment, such as erythromycin ophthalmic ointment, ganciclovir eye gel, etc., to reduce the wearing of corneal contact lenses; 3, vitreous degeneration: seen in highly myopic people and the elderly, there are white lines in the eye, mainly as a result of vitreous components condensation, liquefaction, patients can appear mosquitoes, often with vision loss Occasionally, there can be a significant loss of vision or even cause blindness, need to promptly seek medical attention for the cause of the trigger for drug, laser or surgical treatment; 4, other: the eye into the foreign body, such as a thin white line, etc., can have a foreign body feeling, can be removed by a professional doctor. When parasitic worms infect the eye, the worms are in the form of white threads, such as ocular cysticercosis, which can affect the visual field and vision, and even cause blindness, requiring medical treatment by surgery. It is recommended that people with this condition should pay attention to eye hygiene, whether during treatment or non-treatment, avoid rubbing their eyes directly with their hands, reduce contact between their eyes and unwashed hands, and avoid activities that can irritate the eyes, such as swimming. You can also choose to wear sunglasses to protect your eyes during the summer when the sun is strong.