An ophthalmoscope is a medical instrument used by eye care professionals to examine the interior structures of the eye, particularly the retina, optic nerve, and blood vessels. It allows for a detailed view of the eye's health and can help diagnose various conditions, such as diabetes and glaucoma. The device typically consists of a light source and a series of lenses that magnify the view of the eye. There are different types of ophthalmoscopes, including direct and indirect models, each serving specific purposes in eye examinations.