IOP Pattern in Primary Angle Closure and Primary Angle Closure Glaucoma Patients, Before and After LPI

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