Glaucoma is a serious eye condition, comprising a group of eye diseases, and is a leading cause of sight loss around the world. It has several forms, with primary open angle glaucoma (POAG) the most common. Glaucoma can affect people of all ages but is more prevalent among older adults. It is a progressive condition and has a huge impact on quality of life, affecting the person’s ability to continue to lead a normal life. This article focuses on glaucoma in adults, and provides information on symptoms, risk factors, diagnosis and treatment. The aim is to help nurses and non-medical prescribers to recognise and refer suspected cases, improving outcomes and quality of life for all those affected by this devastating disease.