Opera glass is a term utilized to describe a handheld optical device that magnifies images in spectator events and is also commonly referred to as binoculars. The word opera glass can be substituted in a variety of ways. A pair of binoculars or field glasses can be used in place of opera glasses. A monocular is another option for a single-piece magnifying optical device. Additionally, the word "optics" can be used generally and does not refer to a specific type of device. Other terms include spyglass, telescope, magnifying lens, and eyepiece. Each term is used contextually to name the specific type of optical device and its intended use.