A Comparison of Cataract Surgery Alone and Cataract Surgery With iStent

Inclusion Criteria: * \>18 years of age * Diagnosis of mild-to-moderate open angle glaucoma * Presence of cataract requiring surgery * Good understanding of both verbal and written English * Able to provide informed consent Exclusion Criteria: * Recent intraocular surgery within last 3 months * Other ocular pathology affecting vision * Inability to complete the elements of the study, eg: coma, hemodynamic instability, ventilator dependence, that could be of concern in the investigator's judgment. * Non-elective hospitalisation within the past 60 days that could be of concern in the investigator's judgment. * Medical illness that in the judgment of the investigator would jeopardise the safe completion of the study. Examples include cancer, chronic inflammatory disease, chronic liver insufficiency, epilepsy, thrombocytosis.