A pterygium can be divided into 3 parts in terms of its morphology: growing on the black eye, it is the tip of the pterygium and is called the head. The one that spreads backward in a fan shape, slightly elevated, and is located at the junction of the black and white eyeballs is called the neck. The wide portion of the pterygium that extends to the surface of the white eye is called the body, on which there are many neovascularizations. Pterygium can be divided into the following two types (1) Progressive type: the neck of the pterygium is wide, with many neovascularization, congestion, hypertrophy, and the body is triangularly stretched to both sides, with the head obviously bulging and growing into the surface of the black eye, even obscuring the pupil. (2) Stationary type: the pterygium grows to the edge of the black eye and then stops, it is not congested, slightly red, the head is flattened, the neck and the body are thin, in a relatively stationary state, but does not subside by itself. There is another kind of pseudopterygium, which can grow on any part of the margin of the black eye, usually smaller, with a grayish-white surface, but there are also more hypertrophic ones. Often scar tissue is formed due to trauma, corneal limbal ulcers, and chemical or thermal burns of the conjunctiva, and it usually does not grow after formation. It is completely different in nature from the previous two types of pterygium. What should I do if I have a pterygium? (1) Medication is not necessary for stationary pterygiums that do not invade the black eye and do not affect vision. For those with trachoma or chronic conjunctivitis, antibiotic or glucocorticoid eye drops can be applied, such as 0.25% chloramphenicol or 0.5% cortisone eye drops, 3 to 4 times a day. Chinese medicine can be used to eliminate pterygium ophthalmic solution, 4 times a day. (2) For progressive pterygium or pterygium growing into the black eye affecting vision, pterygium excision should be performed in hospital, but it is easy to recur. When possible, 90 strontium irradiation or β-ray irradiation can be used to prevent postoperative recurrence. Of course, this kind of surgery must be completed under the microscope in order to achieve the ideal effect. Chinese medicine believes that during the treatment period, stimulating foods such as chili peppers and scallions should be avoided, as well as tobacco and alcohol. Prevention Prevention of pterygium is mainly to avoid smoke, wind, sand and sunlight stimulation as much as possible, pay attention to eye hygiene, trachoma or other types of conjunctivitis should be treated in time, and at the same time should pay attention to adequate sleep, regular life, avoiding dry stools and other adjustments to the systemic conditions.