The purpose of this study is to evaluate AZORGA® Ophthalmic Suspension compared to COSOPT® Ophthalmic Solution for IOP-lowering efficacy in subjects with open-angle glaucoma or ocular hypertension.

After the screening examination, subjects were enrolled in the study and moved into the observation period. During the observation period, prostaglandin-analog (PGA) monotherapy was applied. After the observation period of 4 weeks or more, the baseline examination was performed. Subjects were then randomized and moved into the treatment period.

Inclusion Criteria:

• Understand the nature of the study and sign informed consent.
• Diagnosis of open angle glaucoma or ocular hypertension.
• Currently on PGA monotherapy or PGA + alpha-1/beta blocker or PGA + alpha-2 agonist at screening visit, and allowed to instill only PGA for 4 weeks until the baseline visit.
• Intraocular pressure (IOP) ≥ 15 mmHg (at least one same eye) at the baseline visit.
• Other protocol-specified inclusion criteria may apply.

Exclusion Criteria:

• History of bronchial asthma, bronchospasm, or serious chronic obstruction pulmonary disease.
• Uncontrolled heart failure, sinus bradycardia, A-V block (II, III grade), cardiogenic shock, right heart failure due to pulmonary hypertension or congestive heart failure.
• History of hypersensitivity to any of the excipients of the study medications.
• Severe renal function disorders, diabetic ketoacidosis and metabolic acidosis, uncontrolled diabetes, or hepatic disorders.
• Corneal disorder or history of chronic, recurrent or current severe inflammatory eye disease in either eye.
• History of ocular trauma in either eye within 6 months prior to the screening examination.
• Ocular infection or ocular inflammation in either eye.
• History of or current clinically significant or progressive retinal disease in either eye.
• Intraocular surgery in either eye within 6 months prior to the screening examination.
• Ocular laser surgery in either eye within 3 months prior to the screening examination.
• Any abnormality preventing reliable applanation tonometry of either eye.
• Best-corrected visual acuity (BCVA) worse than 0.2 score (decimal visual acuity) in either eye.
• Severe visual field loss in either eye.
• Use of prohibited medication, as specified in the protocol.
• Pregnant, lactating, or intending to become pregnant during the study period.
• Currently on therapy or have been on therapy with another investigational agent within 30 days prior to the screening examination.
• History of or current evidence of a severe illness or any other condition which would make the subject, in the opinion of the investigator, unsuitable for the study.
• Other protocol-specified exclusion criteria may apply.