| Summary: | <strong>Background: </strong>The primary open-angle glaucoma is a problem for public health all over the world. It is a silent and slowly progressive disease leading to blindness. In most patients this can be prevented if the risk factors leading to the disease are detected in time. <br /><strong>Objective:</strong> To describe some epidemiological factors of patients with primary open-angle glaucoma. <strong><br />Methods:</strong> Clinical, epidemiological, prospective and longitudinal study in patients with primary open-angle glaucoma who attended the glaucoma consultation of the Provincial General University Hospital "Dr. Gustavo Aldereguía Lima" of Cienfuegos, from January to February 2009. The following variables were analyzed: age, sex, family and personal medical history, toxic habits and time of diagnosis of the disease. <strong><br />Results:</strong> There was prevalence of primary open-angle glaucoma (87, 5%) mostly in females (53, 6%) and patients over 61 years old as well as in white skinned patients (52 and 62% respectively). Hypertension was the leading entity referred to as pathological personal and family antecedent (62 and 42% respectively). Glaucoma and myopia predominated as previous eye history. The most frequent toxic habits were the consumption of more than 2 cups of coffee a day (53%) and smoking (32%). The largest amount of patients had more than 5 years evolution of the disease. <br /><strong>Conclusions:</strong> Primary open-angle glaucoma occurred mainly in female patients and those with a history
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