Safety and Efficacy of Brimonidine Tartrate/Timolol Fixed Combination in Patients With Glaucoma or Ocular Hypertension

One drop of brimonidine tartrate/timolol fixed combination ophthalmic solution (Combigan®) administered to the affected eye(s) twice daily (morning and evening) for four weeks.

One drop of brimonidine tartrate ophthalmic solution (Alphagan®) administered to the affected eye(s) twice daily (morning and evening) for four weeks.

One drop of timolol ophthalmic solution administered to the affected eye(s) twice daily (morning and evening) for four weeks.

Fixed combination vehicle administered to the affected eye(s) twice daily (morning and evening) for four weeks.