Opera glasses are also known as theater binoculars, performance glasses, concert glasses, and field glasses. These portable devices are designed to help people see the stage or pitch from far away. They are a perfect tool for people who have trouble seeing things from a distance, especially those sitting far from the action. Other synonyms for opera glasses include gallery glasses, balcony glasses, spectator glasses, and sight glasses. All these terms refer to a small and compact device used to magnify a distant object and are commonly used by theatergoers, concert enthusiasts, and sports fans. They come in different sizes and designs and are widely available in camera stores or online shops.