An instrument used to examine the eyes is called an ophthalmoscope. This device allows healthcare professionals to inspect the interior structures of the eye, including the retina, optic disc, and blood vessels. Ophthalmoscopes come in various types, such as direct and indirect models, each offering different levels of magnification and illumination. By enabling detailed observation, an ophthalmoscope assists in diagnosing eye conditions, assessing overall eye health, and detecting systemic diseases that may affect vision. Regular eye examinations with this instrument can help catch issues early, ensuring better patient outcomes.