This clinical investigation is being performed to compare the effect of BOL-303259-X dosed once daily (QD) with timolol maleate 0.5% dosed twice daily (BID) in reducing intraocular pressure (IOP) measured over a 24-hour period in subjects with open-angle glaucoma (OAG) or ocular hypertension (OHT).

Inclusion Criteria:

• Subjects must have a diagnosis of OAG or OHT in 1 or both eyes.
• Subjects who are treatment-naïve must meet the following IOP requirements at Visit 1 (Screening), and pretreated subjects must meet the following IOP requirements at Visit 2 (Washout): Intraocular pressure ≥ 22 mmHg in at least 1 eye and ≤ 36 mmHg in both eyes.

Exclusion Criteria:

• Subjects who have been exposed to BOL-303259-X within 3 months prior to Visit 1 (Screening).
• Subjects with a history or presence of chronic generalized systemic disease that the Investigator feels might increase the risk to the subject or confound the results of the study.
• Subjects with an irregular daily sleep schedule.
• Subjects who are unable to wear sleep monitoring device for 7 days prior to laboratory study.
• Subjects with an anticipated need to initiate or modify medication (systemic or topical) that is known to affect IOP.
• Subjects for whom concomitant use of medications may interact with the safety or efficacy of a nitric oxide.
• Subjects with known hypersensitivity or contraindications to latanoprost or any of the ingredients in the study drugs.
• Subjects who are expected to require treatment with ocular or systemic corticosteroids.
• Subjects who are in need of any other topical or systemic treatment of OAG or OHT.
• Subjects who are unable to discontinue contact lens use during and for 24 hours before the laboratory study.
• Subjects with a central corneal thickness greater than 600 μm in either eye.
• Subjects with any condition that prevents reliable applanationtonometry in either eye.
• Subjects with advanced glaucoma and subjects with a cup/disc ratio greater than 0.8 or a history of split fixation, or a field loss threatening fixation in either eye.
• Subjects with previous or active corneal disease.
• Subjects with a history of severe dry eye.
• Subjects with active optic disc hemorrhage.
• Subjects with a history of central/branch retinal vein or artery occlusion.
• Subjects with a history of macular edema.
• Subjects with very narrow angles and subjects with angle closure, congenital, and secondary glaucoma, and subjects with history of angle closure in either eye.
• Subjects with a diagnosis of a clinically significant or progressive retinal disease in either eye.
• Subjects with any intraocular infection or inflammation within 3 months prior to Visit 1 (Screening).
• Subjects with a history of ocular laser surgery within the 3 months prior to Visit 1 (Screening).
• Subjects with a history of incisional ocular surgery or severe trauma within 3 months prior to Visit 1 (Screening).

ITT Population: All randomized subjects who received at least one dose of study drug, had a baseline and at least one postbaseline intraocular assessment.

Four weeks for each intervention

Safety population included all participants who received at least one dose of intervention