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Francisco José Muñoz Negrete,1 Hans G Lemij,2 Carl Erb3 1Ophthalmology Service, Hospital Ramón y Cajal, Madrid, Spain; 2Glaucoma Service, Rotterdam Eye Hospital, Rotterdam, the Netherlands; 3Augenklinik Wittenbergplatz, Berlin, Germany Abstract: Patient satisfaction with glaucoma treatment has been poorly studied to date. Because glaucoma is a chronic condition in which the therapeutic response is dependent on adherence to treatment, patient acceptability is an important factor in achieving satisfactory outcomes. This multicenter, international (Belgium, the Netherlands, and Spain), epidemiological convenience sample survey among patients commencing treatment with preservative-free latanoprost collected data on patient satisfaction with particular regard to tolerability. A total of 1,541 patients were recruited who were predominantly elderly (74% were over 60 years of age) and female (61%). Most of the patients had previously received preserved topical glaucoma medication (69%), 6.7% had previously received preservative-free medication, whereas 24% had not previously been treated for glaucoma. The great majority of patients (>95%) were satisfied with the preservative-free latanoprost treatment. Among the patients who had previously received preserved medication, 73% of patients found preservative-free latanoprost to be better tolerated and 89% found it at least as easy to use as their prior treatment. Patient satisfaction (determined by a 0–100 mm visual analog scale) was improved by 47% on a switch from preserved treatment to preservative-free latanoprost. Intraocular pressure was similar in patients who had previously received preserved (18.3 mmHg), preservative-free (17.8 mmHg) glaucoma medication or who were naïve to treatment (20.3 mmHg). Preservative-free latanoprost provided effective reduction of intraocular pressure with better tolerability and patient satisfaction than preserved glaucoma medication. This tolerability profile can be expected to improve adherence to treatment in glaucoma patients. Keywords: prostaglandins analogs, glaucoma therapy, preservative, patient satisfaction, tolerability, persistence, tear substitutes