The purpose of this study is to compare glaucoma patients' own I Care measurements by the standard Goldmann applanation tonometer intraocular pressure (IOP) measurements.

not necessary

Inclusion Criteria:

• Ocular hypertension (OHT):with/without glaucoma drugs
• Primary open angle glaucoma (POAG)- high pressure: Diagnosis based on optic nerve head rim loss and/or visual field defects and intraocular pressure (IOP) >21 mmHg.
• Primary open angle glaucoma, normal pressure: cfr high pressure but intraocular pressure ≤ 21 mmHg
• Exfoliative Glaucoma (PEX): Diagnosis based on optic nerve head rim loss and/or visual field defects and intraocular pressure (IOP) >21 mmHg, with exfoliation material in the anterior segment.
• Pigmentary Glaucoma (PDG): Diagnosis based on optic nerve head rim loss and/or visual field defects and intraocular pressure (IOP) >21 mmHg, with Krukenberg's spindle and/or pigment dispersed on the trabecular meshwork.

Exclusion Criteria:

• Age <18 years
• Other glaucoma types
• Corneal pathology (edema, dystrophia, corneal transplantation, severe keratoconus, permanent contact lens wear, recurrent corneal erosion)
• Severe arthritis (unable to handle home i care device)
• Lack of comprehension
• Intra ocular surgery and laser treatment during the last 6 months

Glaucoma patients who are admitted to the hospital for repeated eye pressure measurements learn how to handle the home i care during their stay.