Inclusion Criteria:  Signed informed consent obtained before any study-related activities (study-related activities are any procedure related to extraction of data according to the protocol)  According to the approved indications of Tafluprost / Timolol as indicated in the SPC  Male or female patients ≥20 years of age at time of informed consent Diagnosis of open angle glaucoma or ocular hypertension Insufficient IOP control with a monotherapy utilizing topical prostaglandin analogues, necessitating the use of a combination therapy according to the judgement of the treating ophthalmologist Patient judged by their physician to benefit from preservative free eye drops Not used Tafluprost / Timolol before  Exclusion Criteria:  Patient pregnant or nursing Pregnancy planned in the following 6 months Presence of contraindications as listed in the SPC Any ophthalmologic surgery within 6 months prior to the study Participation in any other investigational study within 30 days prior to enrolment