Study Evaluating the Safety and Intraocular Pressure (IOP) Lowering Response of Brimonidine Tartrate Ophthalmic Solution in Subjects With Open Angle Glaucoma or Ocular Hypertension

Inclusion Criteria: * Be at least 18 years of age at Visit 1 (Screening), of either sex and any race * Be willing and able to provide written informed consent prior to any study procedures being performed. * Be willing and able to follow all instructions and attend all study visits. * Be willing to discontinue use of disallowed medication * Have a documented diagnosis of ocular hypertension, open angle glaucoma or chronic angle closure glaucoma with a patent iridotomy. Exclusion Criteria: * Have known sensitivity or poor tolerance to brimonidine or any other component of the study medications. * Have any form of glaucoma other than open-angle glaucoma, ocular hypertension or chronic angle closure glaucoma with patent iridotomy.