The Effects of the Water Drinking Test on Intraocular Pressure

Inclusion Criteria: * Subject is able to comply with the study procedures * 18-80 years old * Subjects diagnosed with glaucoma, based on presence of repeatable visual field loss and/or glaucomatous optic neuropathy based on masked review of optic disc stereophotographs and under ocular hypotensive treatment, or diagnosed with ocular hypertension, with an IOP of \> 22 mmHg at the screening visit and under ocular hypotensive treatment. * Subject has consented to be in the trial * Visual acuity of 20/80 or better * Ability to understand the character and individual consequences of the study * For women of childbearing potential, adequate contraception * Stable anti-hypertensive treatment regimen 4 weeks prior to the screening visit and throughout the study. Exclusion criteria * Subjects with chronic kidney failure and chronic hear disease * Subjects with contraindications for wearing contact lenses * Severe dry eye syndrome * Keratoconus or other corneal abnormality * Conjunctival or intraocular inflammation * Eye surgery prior to and throughout the study, except prior uncomplicated cataract surgery and laser a minimum of 3 months prior to the screening visit. * Full frame metal glasses during SENSIMED Triggerfish® monitoring * Known hypersensitivity to silicone, plaster or ocular anesthesia (proparacaine) * Pregnancy and lactation * Simultaneous participation in other clinical studies * No patient will be allowed to participate in this trial more than once