Choroidal Blood Flow Response to Hand-grip Test in Progressive Glaucoma

Inclusion Criteria: Patients fulfilling two out of three of the following criteria in one or both eyes: a) typical glaucomatous disc, b) visual field damage (a cluster of three points (except rim points) in at least one hemifield reduced by 5 dB or greater and including at least one point reduced by 10 dB or greater; a cluster of two points reduced by 10 dB or greater; or three adjacent points on the nasal horizontal meridian that differed by 5 dB or greater from their mirror points on the opposite side of the meridian), c) intraocular pressure above 21 mm Hg at least at one occasion. Furthermore, patients need to have a series of at least 5 visual field examinations, after exclusion of the first test, for assessment of progression. \- Exclusion Criteria: * Ametropia \> 3dpt * Inadequate transparency of ocular media as defined by physical examination * Iridocorneal angle extremely narrow with complete or partial closure as determined by gonioscopy * Any abnormality which in the physician's view would prevent reliable applanation tonometry or LDF of at least one eye * History of chronic or recurrent severe inflammatory eye disease such as scleritis or uveitis * History of ocular trauma or intraocular surgery within the past 6 months * History of infection or inflammation within the past 3 months * History of clinically significant or progressive retinal disease such as retinal degeneration, diabetic retinopathy or retinal detachment * Patients with a significant history and/or active alcohol or drug abuse (significant is defined as that which in the opinion of the investigator may either put the patient at risk because of participation in the study or may influence the results of the study or the patient's ability to participate in the study).