1. either sex and any race/ethnicity, ≥18 years old

2. diagnosed with open-angle glaucoma, and/or ocular hypertension

3. meets the following IOP entry criteria:

* Mean IOP ≥ 24 millimeters mercury (mmHg) in at least 1 eye, with the same eye qualifying at 8 AM on both the Eligibility Visit (Day 0) and Day 1

* Mean IOP ≤ 36 mmHg in both eyes at 8 AM and 8 PM at the Eligibility Visit (Day 0), and at 8 AM on Day 1

4. satisfies all informed consent requirements; able to read, sign and date the informed consent

Travoprost Five Day Posology Study