1, eyelid lesions. Because the normal position, structure and movement of eyelids are important conditions to ensure the normal operation of tears and discharge to nasal cavity, if the facial nerve dominating eyelids is paralyzed and the eyelids cannot be opened and closed normally, tears will overflow. Another example is severe blepharitis, chronic conjunctivitis and trachoma. When the eyelid leaves the surface of the eyeball, tears cannot be discharged to the nasal cavity through the lacrimal passage, but can only overflow the eyelid and flow down the surface.
2, the cornea. It's the "black eyes" part. Corneal injury is usually caused by bacterial and viral infections. Acute onset is mainly corneal irritation symptoms such as eye pain, fear of light and tears. Keratosis seriously affects children's vision, even blindness, so parents must pay attention to children's sudden tears and eye pain, and never delay diagnosis and treatment.
3, eyelashes. All kinds of reasons that can cause eyelid entropion can cause trichiasis (commonly known as trichiasis), among which trachoma and blepharitis are the most common. Because eyelashes grow back and rub the cornea, it will cause children to cry, fear of light and pain.
4. Inflammation of lacrimal passage. This is also a common cause of tears overflowing. Such as sty, cellulitis, etc. It can spread to lacrimal canaliculus and lacrimal sac. When tears stay in the lacrimal sac for a long time, bacteria will multiply in large numbers, causing lacrimal canaliculus or dacryocystitis. At this time, there are not only manifestations of lacrimal overflow, but also acute or chronic dacryocystitis, which causes lacrimal sac scar formation. The inflammation of lacrimal canaliculus blocked the narrow part of lacrimal passage, that is, the junction of lacrimal canaliculus and lacrimal sac, and lacrimal passage overflowed.
5, nasal cavity inflammation. Trauma and nasal polyps, obvious deviation of nasal septum or nasal tumor can cause lacrimal duct obstruction or stenosis, and can also cause lacrimal duct overflow.
6. congenital glaucoma. This is a disease that seriously harms children's eyesight. If not treated early, it will bring irreversible harm to children and cause lifelong disability.
7. Other complications. When some children catch a cold, pneumonia or mumps, their eyes will be red and swollen, and the ciliary membrane will be congested, which may also be accompanied by tears. If the child's eyes are healthy, this situation should be short-lived. Once the primary disease recovers, tears will also improve. For more information about glasses, you can look at Tedrolon glasses.