There are four common types of glaucoma, namely closed-angle glaucoma, open-angle glaucoma, congenital glaucoma and secondary glaucoma. Part of the initial diagnosis can be made based on the symptoms, as follows: 1. Closed-angle glaucoma: According to the urgency of the onset, it can be divided into acute and chronic types. Acute type often shows sudden eye swelling and pain, accompanied by ipsilateral headache or even nausea, vomiting, blurred vision and rainbow-like red and green circles around the light bulb, called rainbow vision, which mostly occurs when exerting, emotional excitement or staying too long in the dark. The chronic type is similar to the open-angle glaucoma described below. 2. Open-angle glaucoma: There are no symptoms in the early stage of the disease, so for people who lack common knowledge of glaucoma prevention and treatment, they usually cannot judge themselves and need to rely on the examination of an ophthalmologist to confirm the diagnosis. The development of open-angle glaucoma is insidious, and when vision loss occurs, the disease is often already advanced, with a narrowing of the visual field in the form of a tube or loss. Some patients don’t know that they can’t see in one eye until the vision in the other eye is very poor, thus losing the opportunity for early treatment. Therefore, people over 40 years old should have regular medical checkups, fundus checks and eye pressure measurements. 3, congenital glaucoma: usually appear in infancy or childhood, can be bilateral or monocular onset, mainly manifested as black eyes larger than children of the same age, photophobia, tearing, eyes white, the patient’s eyes often give a “watery” feeling, need to take the child to the hospital in time for examination. 4, secondary glaucoma: usually caused by other pathologies, common causes are traumatic, inflammatory, cataract and fundus pathology. These patients are often seen in the ophthalmology department for other diseases, so this type of glaucoma is not easily missed.