An Ophthalmologist has the knowledge and professional skills needed to provide comprehensive eye and vision care for patients of all ages. Ophthalmologists are medically trained to diagnose, monitor and medically or surgically treat all ocular and visual disorders. They also provide consultative services for the diagnosis and management of ocular manifestation of systemic diseases such as diabetes, hypertension and infectious and non-infectious inflammation. This includes problems affecting the eye and its component structures, the eyelids, the orbit and the visual pathways. In so doing, an Ophthalmologist prescribes vision services, including glasses and contact lenses.