The purpose of this study is to assess the effect of hospital admission on 24-hour ambulatory blood pressure (ABP) in hypertensive subjects.Treated or untreated hypertensive adults with open angle glaucoma underwent in-hospital and outpatient 24-hour ABP monitoring, in random order 4 weeks apart.

Inclusion Criteria:

• age >30 years old.
• subject has signed an informed consent.
• patient has untreated ocular hypertension (IOP at 10:00 between 22-34 mm Hg)
• patient has stage 1 arterial hypertension with or without therapy

Exclusion Criteria:

• secondary hypertension.
• stage 2 or 3 hypertension, history of renal disease.
• sleep apnea.
• diabetes mellitus
• acute or chronic inflammation.
• myocardial infarction or unstable angina within the past 6 months.
• heart failure NYHA class III-IV.
• active liver disease.
• pregnancy.
• history of drug or alcohol abuse, or any other condition with poor prognosis.
• treatment with non-steroid anti-inflammatory agents, corticosteroids, beta-blockers, or any other regimen that could affect BP levels.
• smoking

Subjects with untreated ocular hypertension and stage 1 arterial hypertension with or without treatment with anti-hypertensive agents.