Introduction: Glaucoma is the second leading cause of blindness. 90% of patients do not know they have glaucoma in developing countries. One barrier preventing patients from accessing medical services for glaucoma is the limited knowledge, attitude, and practice about this disease. This requires further studies on knowledge, attitude, and practice about glaucoma, which serve as a basis solutions to improve service access. Objectives: 1) To describe the knowledge, attitude, the practice of glaucoma in persons over 40 years old in Hue city. 2) To find out some factors related to the knowledge, attitude, practice about glaucoma Methods: A descriptive cross-sectional method was conducted on 2.025 people over 40 years old in 27 wards of Hue city. Results: Good knowledge is accounted for 2.5%, positive attitude is accounted for 3.7%, a good practice is accounted for 2.5%. There was an association with statistical significance (p<0.05) between glaucoma practice and the following factors: occupation, education level, knowledge, and attitude about glaucoma. Conclusion: Most participants have poor knowledge, attitudes, and practices about glaucoma. Glaucoma practice is statistically significantly associated with occupation, education, knowledge, and attitude about glaucoma |