Reduction of Intraocular Pressure After I-stent By-pass Implantation in Eyes With Open Angle Glaucoma

Inclusion Criteria: * co-existing glaucoma and cataract (NC1, NC2) classified by means of the LOCS III scale (Lens Opacity Classification System III) * patients with primary open-angle glaucoma (POAG), pseudoexfoliative glaucoma (PGX) and normal tension glaucoma (NTG), with topical hypotensive treatment * written consent to involvement and participation in the study for a period of at least 12 months was obtained from all patients after they had first been informed of the nature of the procedure and other surgical alternatives Exclusion Criteria: * no consent to participation in the study * prior surgical and laser procedures in the area of the eye * narrow- or closed-angle glaucoma * post-inflammatory or post-traumatic secondary glaucoma * chronic illness of the cornea or optic nerve * advanced macular degeneration * active inflammatory process * pregnancy * systemic steroid therapy