Glaucoma is a general term for a group of diseases characterized by optic nerve damage and visual field defects. Glaucoma is currently divided into: first, closed-angle glaucoma, open-angle glaucoma, also known as primary glaucoma. Second, secondary glaucoma. Third, infantile glaucoma. Clinically more common is primary glaucoma, primary glaucoma is divided into closed-angle glaucoma and open-angle glaucoma, closed-angle glaucoma is divided into acute closed-angle glaucoma, chronic closed-angle glaucoma. Open-angle glaucoma is not divided into chronic and acute. Open-angle glaucoma and chronic closed-angle glaucoma may be completely asymptomatic, and by the time they are examined they are already in the middle or late stages. When acute closed-angle glaucoma strikes, there are typical symptoms such as eye swelling, eye pain, and vision loss.