The purpose of the study is to determine the relationship of the intraocular pressure patterns recorded during 2 sessions using Triggerfish, before and after elective laser peripheral iridotomy in angle closure glaucoma patients

Inclusion Criteria:

• Diagnosis of Primary Angle Closure (PAC) or Primary Angle Closure Glaucoma (PACG) with indication for Laser Peripheral Iridotomy (LPI). PAC is defined by the presence of a partial or complete iridotrabecular contact(ITC) in more than 2 quadrants with either raised intraocular pressure (IOP) (ie. more than 21 mmHg) and/or PAS; however, with normal optic disc and visual field. PACG is defined by the presence of ITC with either raised IOP and/or PAS, and evidence of glaucomatous optic disc and visual field
• No IOP-lowering drug treatment or a 4-week wash-out period prior to Study Day 0
• Aged ≥18 years, of either sex
• Not more than 6 diopters spherical equivalent on the study eye
• Have given written informed consent, prior to any investigational procedures

Exclusion Criteria:

• History of acute angle closure glaucoma on the study eye
• Secondary angle closure glaucoma on the study eye
• History of ocular surgery within the last 3 months on the study eye
• History of ocular laser treatment, including previous LPI on the study eye
• Corneal or conjunctival abnormality precluding contact lens adaptation on the study eye
• Severe dry eye syndrome on the study eye
• Patients with allergy to corneal anesthetic
• Patients with contraindications for silicone contact lens wear
• Patients not able to understand the character and individual consequences of the investigation