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AIM: To explore levels and determinants of awareness and knowledge about glaucoma among patients. METHODS: This was a cross-sectional study that included adult patients from October to the end of December 2018. A semi-structured questionnaire was designed by the researchers to measure the levels of awareness and knowledge about 18 basic information about glaucoma. The sheet was divided into 4 domains: types of glaucoma, risk factors, clinical features, and management. A knowledge score (KS, range=0-18) was calculated, with higher scores indicating higher levels. RESULTS: A total of 383 patients responded to the questionnaire, 61.9% males, mean±SD age was 38.5±12.94 years old, and 61.6% had a university degree or higher. Of them, 6.3% and 23.2% reported personal and family history of glaucoma, respectively. The most frequently reported source of information about glaucoma was another person with glaucoma (28.2%), followed by physicians (24.8%) and TV (19.6%). Knowledge by item ranged from 3.1% to 82.5% correctness rate, while KS showed mean=5.91 and median=5; and reliability testing of the knowledge scale showed Cronbach's alpha=0.782. Higher KS were found among respondents with higher educational level (P=0.036), diabetes history (P=0.025), and personal (P