Corneal fistula

Sometimes corneal fistula is formed after corneal perforation is incomplete. In the center of the leukoplakia, a small, dark black bulge appeared, while the anterior chamber disappeared and the eyeballs became soft. At this moment, the compensatory effect of the eyeball occurs immediately, increasing the aqueous humor production in order to maintain the normal hardness of the eyeball. If this bulge is closed by the new membrane, the increased aqueous humor production will inevitably increase the intraocular pressure and cause secondary glaucoma. If the intraocular pressure continues to increase, it can cause symptoms of acute glaucoma attacks, and this layer of film breaks through, the symptoms disappear immediately, and the eyeballs become soft again. However, shortly afterwards, the fistula was closed by the new membrane, and the intraocular pressure increased again. Repeatedly repeated in this way, eventually due to violent bacterial infection, endophthalmitis, pancreatic abscess or hemorrhage occurred in the eye, and finally the eyeball atrophy. It may also end because of long-term softening of the eyeballs, flattening of the cornea, clouding of the lens, and even retinal detachment. The corneal fistula is not a fistula, but a loose tissue embedded in the corneal hole, and the aqueous humor leaks from the crack. A corneal fistula is most likely to occur in a patient whose edge of the pupil is embedded in the area of ​​the corneal perforation. The aqueous humor often leaks out along the edge of the pupil, and epithelial cells are not easy to repair. It can be seen that the main symptoms of corneal fistulas are dark black bulges on the corneal surface, disappearance of the anterior chamber, and softening of the eyeballs. In addition, it can be proved by fluorescent staining. One of the complications of keratitis. Keratitis is divided into ulcerative keratitis, also known as corneal ulcer. Non-ulcerative keratitis is two types of deep keratitis. It is caused by internal factors and external factors. Inflammation caused by corneal trauma, bacteria and viruses invading the cornea. The affected eye has a foreign body sensation, tingling or even burning sensation. Mixed congestion on the surface of the bulbar conjunctiva with symptoms of photophobia, tearing, visual impairment, and increased secretions. The surface of the cornea is infiltrated with ulcers. Ulcerative keratitis, also known as corneal ulcer, is mostly caused by external factors, that is, inflammation caused by infectious pathogenic factors invading the corneal epithelial cell layer.