The purpose of this study is to evaluate the intraocular pressure (IOP) lowering efficacy and the safety and tolerability profile of trabodenoson ophthalmic formulation compared to timolol maleate ophthalmic solution 0.5% in adults with ocular hypertension (OHT) or primary open-angle glaucoma (POAG) who are already receiving treatment with latanoprost ophthalmic solution 0.005% once every evening (QPM).