A Study Demonstrating The Effect Of Latanoprost In Combination With Timolol, Latanoprost Alone And Timolol Alone On Eye Pressure In Open Angle Glaucoma Or Ocular Hypertension In Patients

Inclusion Criteria: * Unilateral or bilateral primary open angle glaucoma, capsular glaucoma, pigmentary glaucoma or ocular hypertension. * Patients currently on IOP reducing therapy: IOP greater than or equal to 25mmHg (two IOP determinations at pre-study separated by at least one hour) OR Patients without IOP reducing therapy: IOP greater than or equal to 30mmHg (two IOP determinations at pre-study separated by at least one hour). Exclusion Criteria: * History of acute angle closure or closed/barely open anterior chamber angle. * Current use of contact lenses. * Ocular surgery or argon laser trabeculoplasty (ALT) within three months prior to pre-study visit. * Ocular inflammation/infection occurring within three months prior to pre-study visit. * Hypersensitivity to benzalkonium chloride or to any other component of the study drug solutions. * Other abnormal ocular condition or symptom preventing the patient from entering the study, according to the investigator's judgement. * Cardiac failure, sinus bradycardia, second and third degree of atrioventricular block. (The routines for prescribing topical B-blocking agents will be followed. * Bronchial asthma, history of bronchial asthma or chronic obstructive pulmonary disease. (The routines for prescribing topical B-blocking agents will be followed). * Pregnancy * Women of childbearing potential who has not used adequate contraceptive methods during the last three months. * Inability to adhere to treatment/visit plan. * Have participated in any other clinical study within one month prior to pre-study visit.